Your one-stop source for sea-level information, with interactive tools for linear and quadratic regression analysis, and graphing, of measured sea-level trends, at over 1200 locations.
Learn about climate change...
If you'd like to learn more about climate change, here are some trustworthy resources:
- February 24, 2022 — NEW! The “P.S.” menu item now works. ↑
- February 22, 2022 — NEW! I've added
information about forest fires
to the https://sealevel.info/learnmore.html (“Learn More About Climate Change”) page,
and made some structural improvements to the web site.
Many of the topics on the https://sealevel.info/learnmore.html
page now have customized-per-topic Twitter and Facebook “cards” defined. So, for example, if you Tweet a link
to https://sealevel.info/learnmore.html?0=fires#fires the
tweet will look something like this:
But if you Tweet a link
to https://sealevel.info/learnmore.html?0=sealevel#sealevel the
tweet will look like this:
The top-of-page menus have also been restructured. ↑
- November 29, 2021 — I've created a little online spreadsheet, where
you can enter your own estimates for common climate parameters, like the percentage of warming since the LIA
which was caused by man, the ECS-to-TCR ratio, etc., and it will calculate estimates
of climate sensitivity, unrealized warming “in the pipe,” and Earth's radiative imbalance:
It also includes notes and references for how those things can be estimated and calculated. ↑
- April 3, 2021 — I've built an extreme-precision binomial probability calculator, in Perl. (On Windows I use
Strawberry Perl, but most recent version 5 Perls should work.) To download it, right-click
here, and "save link as" or "save target as," or similar. It is a work in progress; no warranties, express
April 12, 2021 — I've added a web interface to the extreme-precision binomial probability calculator.
April 23, 2020 — I've greatly improved the extreme-precision binomial probability calculator, especially
May 24, 2021 — I've enhanced the extreme-precision binomial probability calculator, to try to
display only the correct number of significant digits in results. ↑
- March 25, 2021 — I've consolidated my collection of information about Covid-19, vaccines, and investigational treatments,
here: https://sealevel.info/covid.html ↑
- February 11, 2021 — Have you marveled at the depth of division in today's society?
My friend, Payne Kilbourn, explains how it happened. ↑
- December 23, 2020 — Here are the
references (and other Covid-19-related resources)
for my Washington Times
guest op-ed, Sunday Dec. 27 online, Monday Dec. 28 in print (archived here). ↑
- September 2, 2020 — My guest column on WND:
Dr. Scott Atlas is dead wrong about handling
COVID (or pdf, or preprint). ↑
- August 8, 2020 — Much of reddit is very heavily censored, to enforce uniformity of leftist thought.
They “shadowban” users' comments, to try to prevent the users from realizing that they're censored.
This is a shadowbanned comment which I attempted
to post, in reply to someone who is worried about “ocean acidification.” If ocean acidification worries you then you might find my remarks
- June 29, 2020 — This is an extraordinary mea culpa from uber-environmentalist Michael Shellenberger:
behalf of environmentalists, I apologize for the climate scare
(or pdf). ↑
- June 20, 2020 — I am very grateful to the kind folks at the Polish Institute of Meteorology and Water Management,
who sent me the latest sea-level measurements for Swinoujscie, Poland.
It now has data from January, 1811 through December, 2019, with just one six-year gap, plus one seven-month gap, making it indisputably one of the very best long sea-level
measurement records in existence. ↑
- June 12, 2020 — A few people claim that atmospheric CO2 levels are rising, not because
of mankind's CO2 emissions, but, rather, because the oceans are outgassing CO2, due to global
warming. They're wrong. ↑
- May 31, 2020 (updated June 25, 2020) — This site now has tools to graph and analyze sea-level
measurements from weighted averages of lists of tide gauge locations, instead of just one site at a time. So you can create your own
“sea-level index” using the data you trust the most.
Currently, it just omits months for which one or more sites lack data, except that it will interpolate for single missing months.
Here's an example (Honolulu+Harlingen). Click the image to see the source page and latest data: ↑
- May 16, 2020 — We've updated the sea-level data with the latest from NOAA. If you notice any problems, please tell Dave, ASAP!
- May 6, 2020 — We've updated the sea-level data with the latest from PSMSL ("27 Apr 2020"). If you notice any problems, please tell Dave, ASAP! ↑
- May 3, 2020 — Sealevel.info is on a new server today. If you notice any problems, please tell Dave, ASAP!
The old server can temporarily still be accessed at http://sealevel.info:8080/. ↑
- April 21, 2020 — The Scientific
Case for Vacating the EPA's Carbon Dioxide Endangerment Finding, by Patrick J. Michaels. ↑
- April 20, 2020 — “Expert” estimates of the true number of cases of COVID-19 in the United States vary by more
than a factor of ten. However, we can work backward from the number of fatalities, and the best-case (South Korean!) fatality rate, to estimate the
true number of cases.
When we do that arithmetic, we find that
for every known COVID-19 case in the U.S.
there have probably been between 1.1 and 4.6 undetected cases (2.85 ±1.75), which were (or are so far) either completely asymptomatic, or
had (or have) symptoms too mild to require hospitalization.
Based on the current number of known U.S. cases (764,265), that indicates that the actual number of COVID-19 cases in the U.S. is between
1.6 & 4.3 million (i.e., 3.0 ±1.4 million), which is 0.9±0.4 percent of the U.S. population. ↑
- April 17, 2020 — To calculate the true COVID-19 fatality rate for a country like the United States, were many cases are
undiagnosed, and where many of the infections have not run their course (so we don't know how many will recover, and how many will die), is challenging,
and estimates vary widely.
But the calculation is not challenging for South Korea. They've used aggressive testing and contact tracing to identify nearly everyone who is infected,
regardless of whether they have symptoms. Plus, 70% of their cases are resolved, and they've nearly eradicated the disease. So they have “near-final” data.
From that data we can
calculate that the true CV-19 fatality rate in South Korea is between 2.16% and 2.87%.
(That's with very early diagnosis and treatment, and an unstressed healthcare system; in most other countries the fatality rate is undoubtedly
- April 10, 2020 — WUWT article: AR6 WG1 SOD Reviewers are needed — please light a candle
- March 12, 2020 — The Heartland Institute has created a new and very useful web site called,
“Climate At A Glance.” It currently has twenty brief, but high-quality,
articles on climate-related topics. ↑
January 22, 2020 — The highest quality surface temperature measurements in the world are from the U.S. Climate
Reference Network (USCRN). Unfortunately, the USCRN data only goes back to 2005. But it shows that in the “lower 48”
States there's been no clear temperature trend over the last fifteen years.
In the contiguous United States, 2019 was the 11th warmest year, and the 5th coolest year, of the last 15 years.
Here's a spreadsheet with the data,
here's NOAA's graph,
and here's a good article
about it. ↑
- January 7, 2020 — Tomorrow's edition of The Pilot newspaper will include my guest op-ed column about
Prof. Mann's misleading Dec. 5, 2019 presentation in Southern Pines. Here's a copy of the article with hyperlinked references added:
- December 6, 2019 — Prof. Michael Mann was in North Carolina last night, to deliver a Ruth Pawley Lecture
in Southern Pines. I attended. These are my notes.
- August 31, 2019 — CNN vs. what the science says
(and there's a slightly abbreviated version on WUWT).
- August 27, 2019 — Former President Obama apparently doesn't actually believe the nonsense
he used to parrot, about dangerous climate change and sea-level rise. He and Michelle just purchased an
enormous seaside mansion, barely above sea-level, on Martha's Vineyard.
- January 31, 2019 — Drs. Roy Spencer and John Christy debunk speculation that global warming causes
frigid winters: If the Polar Vortex is due to Global Warming, Why are U.S. Cold Waves Decreasing? ↑
- December 8, 2018 — I can recommend this excellent guest editorial today by Paul Driessen, at TownHall.com:
Climate Lunacy Takes Center Stage ↑
- November 14, 2018 — Most readers here probably know that I am very honored to have
been invited to join the CO2 Coalition, an organization of mostly-prominent
scientists (plus a few no-names like me!), dedicated to de-politicizing the public debate surrounding CO2
emissions and climate change, and helping to substitute sound scientific analysis for unscientific climate
Today I'm pleased to share a letter by Prof. William H. Smith
entitled, The Double Bind and Scientific Honesty, in which (among other things) he explains why
he, too, is very pleased to be a member of the CO2 Coalition.
In his letter Prof. Smith also mentions this 30 year old (1988)
editorial, by the late
Dr. Stephen Schneider, in which Dr. Schneider wrestled with “groping to find the balance between
being effective and being honest.” Not mentioned in his editorial was the fact that, at that time,
Dr. Schneider was a relatively fresh convert to global warming alarmism. A decade earlier, he made an
appearance in this 1978 television program (starting at about
the 6:00 minute mark), worrying about (can you guess?), global
- October 7, 2018 — An
of global warming data finds it riddled with errors: #Datagate!
ever audit of global temperature data finds freezing tropical islands, boiling towns, boats on
Follow-up (Oct. 15) — Met Office responds to HadCRUT global temperature audit by McLean.
- September 26, 2018 —
I can highly recommend this
excellent article by Jim Steele on WUWT, about the tug-of-war in California between science and sea-level
- September 24, 2018 —
Another short WUWT article:
Ice Sheet apparently gains mass for the 2nd year in a row. ↑
- September 10, 2018 —
Apologies in advance if sealevel.info goes down during the hurricane, which is likely.
In the meantime, if you want to learn more about climate change, here are some good resources:
UPDATE: Thankfully, we had no problems, and no damage. The power didn't even go off. ↑
- August 15, 2018 —
Our CO2 data and graphs have been updated to include an estimate for 2018, 408.4 ppmv
(based on seasonally-adjusted June & July measurements). ↑
- August 14, 2018 —
WUWT article: A
shining example of @Google and @YouTube protecting us against misinformation. ↑
- August 13, 2018 —
I'm looking forward to watching this series of educational lectures, from Camp Constitution 2018:
- Climate Change, with Lord Monckton
- California Wild Fires, Agenda 21-2030, with Debbie Bacigalupi
- The Global Warming, Climate Change Hoax, with Prof. Willie Soon
- Are the Sea Levels Rising? with Prof. Willie Soon ↑
- July 2, 2018 — Prof. Ross McKitrick's June 20, 2018
Financial Post article
is an exceptionally clear yet thorough discussion of ECS climate sensitivity. (You can also find information on that
topic on the salevel.info “Resources” page.) ↑
- June 2, 2018 — We
got a letter to the editor in the Wall Street Journal, with
a lot of help from my friends, meteorologist Tom Wysmuller, and Prof. Will Happer.
the original version, as we submitted it (with references and a graph).
Here's the WSJ's online version
(click to enlarge) ↑
Our letter was in response to one by Profs. Andrea Dutton and Michael Mann. For a critique of a video interview
with Prof. Dutton, see:
If you want to learn more about climate change, here are some good resources:
https://co2coalition.org (Happer, et al)
The top climate blog (news & discussion):
- April 26, 2018 — Updated with latest PSMSL data.
- April 14, 2018 — It's now been six years since
the “Fakegate” scandal,
in which the Climate Movement's top ethicist, Dr. Peter Gleick, and the climate activists at DeSmogBlog,
conspired to smear Heartland Institute with a clumsily forged fake “strategy
They got caught, which you'd think would end their careers, and land at least some of them in prison.
But it really hasn't hurt them much. The Obama-appointed U.S. Attorney protected them by refusing to prosecute
until the statute of limitations had run out, and most climate activists don't seem to mind being lied to.
- March 27, 2017 — A Tutorial On Climate Change. Oakland and San Francisco, California,
have have filed lawsuits against oil companies to recover costs associated with adapting to climate change.
U.S. District Judge William Alsup, who is presiding over the case, requested that the parties provide tutorials
on climate change and the history of climate science.
This is one such tutorial, submitted to the Court as an amicus brief by three extremely distinguished
scholars: Drs. William Happer, Steven Koonin, and Richard Lindzen:
- February 14, 2018 — A few decades ago, the focus of most “climate scientists” (who were
generally called climatologists, back then), shifted from observations to modeling.
These days, all the climate catastrophists' predictions are based on alarming computer models, which, despite 2/3
century of rapidly climbing greenhouse gas emissions and levels, are still largely unconfirmed by measurements.
Enough time has elapsed to compare those early computer projections with measured reality. So how have they fared?
Here I examine the very alarming predictions of a groundbreaking and highly influential 1988 climate modeling paper:
3½ months after that paper was published, the IPCC was founded, to address that perceived problem—which
turns out to have been much ado about very little.
- January 19, 2018 — I am quite impressed by
PragerU's videos on climate change.
- October 27, 2017 — How did news organizations like WRAL come to believe that it's valid journalism to
seek out "experts" at only one extreme of the range of the scientific opinion, for their "documentaries?" That's
not news reporting, that's propagandizing.
Here's NC's longest, highest-quality sea-level record (Wilmington), plus the WRAL prediction.
Sea-level there has been rising at about 2.3 mm/year for the last 82 years.
WRAL predicts 11.1 mm/year over the next 83 years = ~5x as fast as the real trend. That's despite the fact that,
other than spikes with strong El Ninos, there's been no significant acceleration in sea-level rise, so far.
Read more here:
- October 25, 2017 — The New Republic and Wired both ran a ridiculous
disinformation story entitled, “Climate Change Is Killing Us Right Now.” This was
- On Tuesday, Sept. 12, 2017, at 7 p.m. there
will be was an
ICON Lecture in Chapel Hill, NC, with my friend, Princeton
physicist Will Happer. (I manned the info table.)
- July 29, 2017 — Our Internet service went down yesterday, and it's still down. As of this morning, the
server is back up (sort of), limping along on a lower-bandwidth, jury-rigged temporary connection. Please forgive
the outage and the sluggish response times.
Update: as of July 31, 2017 we're back up on the regular connection.
- June 1, 2017 — I'm proud that North Carolina's U.S. Senator Thom Tillis signed this excellent letter to President Trump:
- May 23, 2017 — I've
made several minor improvements on the site. One is that on the data analysis pages for tide gauges you may now override
the default width and height for the graphs.
- May 21, 2017 — New WUWT article:
scientist Josh Willis shows you how to deal with your climate change denying uncle - but fails.
- March 27, 2017 — I've added an option to plot an extra line segment or curve, typically
used to display a forecast of future sea-level rise. The projection can be drawn with either a
constant acceleration curve, or a constant slope (linear). For example, here are the
graphs showing the wildly unrealistic accelerations required to
reach the “three feet by 2060” prediction of some of the crazier climate alarmists for Miami.
- February 9, 2017 — The Next / Previous buttons on the sea-level analysis pages now do a better
job of taking you to a related page (e.g., another site in the same country/coast).
- January 26, 2017 — Try the new (preliminary) country/coastline code list on the Data page.
- January 21, 2017 — Article on WUWT about this site:
New website gives you the real deal on sea level rise and rates
- January 9, 2017 — All 1269 tide stations now have "thumbnail" graphs. (Technical note:
the graphs are generated using Google Visualization tools,
- January 5, 2017 — First release of interactive sea-level analysis and visualization tools.
There are currently 1269 tide-station locations in the database, with sea-level data.
There are still a few rough edges, and a hefty to-do list; your feedback is valued!
- December 25, 2016 — Merry Christmas! For your holiday enjoyment, here are
five facts about climate change,
which I posted on Quora.
Here's an earlier Quora screed, about what it means to be a “skeptic” about global warming.
- December 2, 2016 — North Carolina's top environmental official,
DEQ Secretary Don van der Vaart,
has written two excellent letters about the role and policies of the EPA, which are worth your time to read.
The first, which was also signed by the top environmental officials of four other States, was to President-elect Donald Trump.
The second was to EPA Administrator Gina McCarthy. ↑
October 3 - November 27, 2016 — Here's a preview of upcoming sea-level visualization tools at SeaLevel.info.
These are graphs of sea-level at Honolulu, Hawaii
Wilmington, North Carolina
Chuuk Atoll, Micronesia
and many other locations
with many interactive features
Options are provided to choose the data source (NOAA vs. PSMSL, though not yet for all locations), to choose whether to display the
linear trend (calculated from all available data, rather than recalculated every few years, as
NOAA does) and/or quadratic trend (for detecting acceleration/deceleration), and to choose
whether to display confidence intervals, prediction intervals, and CO2 level. Additionally, you
can optionally constrain the range of dates shown or analyzed, smooth the data in various ways,
and adjust various display options, such as colors and line thickness.
April 6, 2016 — Sea-level is not rising everywhere. The measured rate of coastal
sea-level change varies from
-17.59 mm/yr at Skagway, Alaska
to +9.39 mm/yr at Kushiro, Japan.
The average, as measured by the world's best long-term coastal tide gauges, is just under +1.5 mm/yr.
That rate has not increased (“accelerated”) in over 85 years.
- March 28, 2016 - Ooops!
Alarm over sinking islands premature as sea level falls at Kwajalein Atoll.
- February 3, 2016 — New "Feedbacks" page added. Everything You
Always Wanted to Know About Climate Feedbacks* (*But Were Afraid to
It's still a bit rough around the edges. As always, I would be grateful for your
feedback comments & corrections.
- December 18, 2015 — The Heartland Institute is
one of the world's finest public policy think tanks, and they've compiled
an impressive collection of information about the COP-21
Paris climate conference, here:
P.S. (12/28/2015) — someone complained about this link, who had apparently been misled by the Peter Gleick /
DeSmogBlog forged document smear of Heartland.
If you're not familiar with the story, read on. Dr. Gleick tried to anonymously
distribute a “strategy memo” purportedly leaked from Heartland, which was
actually a forgery, almost certainly created by Gleick, himself.
Here's an article
about the affair, from The Atlantic. Gleick was subsequently rewarded for his
crimes by National Geographic's ScienceBlog subsidiary, where he's now their
resident “scientist, innovator, and communicator” on global water, environment,
climate, and presumably identity theft, fraud, character assassination, and forgery. ↑
- December 14, 2015 — Good essay today in USA Today
by Rep. Lamar Smith (R-TX), chairman of the U.S. House Science, Space and Technology Committee.
- December 8, 2015 — The Resources page of this site got a long-overdue
reorganization. Suggestions for further improvement are very welcome.
- October 16, 2015 — Environmentalist David Siegel shares
What I Learned about Climate Change.
He learned a lot, and so can you.
- May 12, 2015 — Australia's Joanne Nova reports on
scandal of sea levels — rising trends, acceleration — largely created by adjustments.
- May 5, 2015 — Here are Dave Burton's remarks at
the North Carolina Coastal Resources Commission meeting
in Manteo, NC, on April 29, 2015. It's part of the latest chapter in North Carolina's simmering
kerfuffle over sea-level rise.
- April 2, 2013 — NOAA has released a major update of
their tidestation data,
with updated trend analysis and graphs for many stations, and many newly-analyzed
PSMSL stations! See the new 2013 spreadsheets on the sealevel.info data page.
(Note: as a result of these changes there are a few dead links in some of the older
spreadsheets, which I've not yet fixed.)
- March 23, 2013 — Rev 0.7, added a spreadsheet with just the 45 NOAA-administered GLOSS-LTT tide stations,
and also one with just the 42 of those 45 for which there was data through 2011. (The other
stations were three Pacific Islands: Johnston Atoll, Pago Pago, and Chuuk.)
In 2012 NOAA recalculated sea-level trends for those
42 U.S. tide gauges
using data through 2011. The results were illuminating.
The sea-level records for the 42 gauges had an average duration of 87.4 years (through 2011),
and NOAA's calculated trends had an average confidence interval of ±0.515 mm/yr.
When new (through 2011) trends were compared to the old (through 2006) trends, 23 sites showed
slight declines in the rate of sea-level rise, and 19 showed slight increases.
A simple, unweighted average of the 42 gauges comes to 2.025 mm/yr average rate of SLR through 2006,
or 2.026 mm/yr through 2011 (a difference of one one-thousandth of a millimeter/year), or 1.286 mm/yr
if you include Peltier's VM2 GIA adjustments.
The bottom line is that, as measured by the 42 best U.S. long-term trend tide stations,
the average rate of sea-level rise over the 5-year period from 2006-2011 is virtually identical
to the rate for the full data record (averaging 87.4 years duration) -- more proof that there's
been no detectable acceleration in rate of sea-level rise in response to elevated CO2 levels.
- March 8, 2013 — updated spreadsheets with latest NOAA and PSMSL data.
- March 1, 2013 — Rev 0.6, most of the spreadsheets here
now have clickable column headers. Click a column header to sort the data by that
column. Click again to reverse the sort order.
- September 29, 2012 — Rev. 0.5, added more papers to the Papers page, and more
resources to the Resources page
- August 23, 2012 — Rev 0.2-0.4, moved resources list to Resources page, and added
BlogRoll, Papers & Data pages
- August 19, 2012 — Rev 0.1
- August 15, 2012 — under construction
Last modified: 15-Jan-2023 (version 140)
Copyright © 2012-2022, David A. Burton.
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