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  Now here is something scary... 👻 And some more spooky climate trends for today: https://www.climatecentral.org/climate-matters/october-nights-warming-us-cities #HappyHalloween! 🎃

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  I hope you all don't mind polar bear pictures from my trip that I'll be randomly sharing over the next few weeks 🤭 Here's one from yesterday in the Churchill Wildlife Management Area. Some of the surrounding ponds and wetlands are beginning to form ice, and we receiving a dusting of snow overnight.

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  My first hour on the tundra has some curious visitors… 🥶

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  I'm headed up to the tundra next week to observe the annual polar bear migration along the Hudson Bay in Canada and do science communication and educational outreach on the effects of our rapidly warming Arctic. We'll also be livestreaming from their tundra buggy! Follow along with our trip at: https://polarbearsinternational.org/news-media/events/the-importance-of-storytelling/

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  Last month observed the largest relative warming signal in the Arctic, which is not surprising for this time of year as the sea ice reforms. The tropical (El Niño) signal is really remarkable though. [Plot shows zonal-mean temperature anomalies, where latitude = y-axis (not scaled by distance).]

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  Saturday El Niño update - Sea surface temperatures are still warming across Niño region 3.4 over the last week. Note that I finally had to readjust the scale on the map view, so it's not quite comparable to prior updates. Data from NOAA OISSTv2.1: https://www.ncei.noaa.gov/products/optimum-interpolation-sst

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  Trends in October #Arctic sea ice thickness over approximately the last four decades (through 2025)... 🟦 - increasing ice thickness 🟥 - thinning ice Simulated data from PIOMAS. For more information: https://doi.org/10.1175/JCLI-D-17-0436.1

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  El Niño is everywhere in the headlines, but ultimately human-caused climate change is the key reason for the record global warmth. 📈 Curious about how these two climate stories relate? Learn more in our latest report: https://www.climatecentral.org/climate-matters/el-nino-global-temperatures-explained

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  Last month was the 2nd hottest September on record for our planet. The last couple of years have been exceptionally warm considering the historical record. 📈 This data is using NOAAGlobalTempv6.1.0: https://www.ncei.noaa.gov/products/land-based-station/noaa-global-temp

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  Patterns of October temperatures in the #Antarctic when averaged by decade... Data from @CopernicusECMWF@masto.ai ERA5 reanalysis.

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  Much of the perimeter of the #Arctic Ocean is getting wetter during the month of October. This is largest over the Barents-Kara Seas region, along with the eastern coast of Greenland. + Data: https://psl.noaa.gov/data/gridded/data.gpcp.html + More info: https://doi.org/10.25923/11nn-hn03

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  We're excited to share our new climate change indicators tool, featuring interactive, regularly updated data visualizations and access to the underlying data! We're hoping to expand this feature over time, so let us know what other indicators you'd like to see! ➡️ Global Indicators (English and Spanish): https://www.climatecentral.org/tools/climate-indicators ▶️ Local climate: https://www.climatecentral.org/climate-local

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  Watch the changes in 100 years of average January-September temperature anomalies over land areas through 2026... Data from NOAAGlobalTemp v6.1.0: https://www.ncei.noaa.gov/products/land-based-station/noaa-global-temp

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  #Arctic climate rankings are now in for September 2026: https://zacklabe.com/archive-2026/. It was unusually warm again. No updates on PIOMAS sea-ice volume and thickness. #SciComm #DataViz #OpenScience #OpenData

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  Evolution of September #Arctic sea ice and sea surface temperature (SST) anomalies during the satellite-era... A summary of last month can be found from the NSIDC at https://nsidc.org/sea-ice-today/analyses/stranger-things-2026-arctic *SST data set (OISSTv2.1) is only available since about 1982

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  The extreme 'warmth' over western Siberia and extending into the Kara Sea has been extremely persistent for the last few months. September continued with this widespread anomaly, exceeding 5°C above the 1981-2010 average. Data from @CopernicusECMWF ERA5 reanalysis.

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  “One of the strongest El Niños on record is unfolding on top of a much warmer climate. We can expect many extremes to be further amplified, including hotter heat waves and a supercharged water cycle. These changes can have major impacts on local communities and ripple through the global economy.” Our recent state of the climate briefing: https://www.youtube.com/watch?v=YHpDb-QAifs

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  Have a good weekend! Here's your Friday ice update - #Arctic sea ice extent is currently the 14th lowest on record (JAXA data)... • about 280,000 km² above the 2010s mean • about 1,010,000 km² below the 2000s mean • about 2,090,000 km² below the 1990s mean • about 2,500,000 km² below the 1980s mean More graphics: https://zacklabe.com/arctic-sea-ice-extentconcentration/

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  Maps of temperature departures averaged over the last month (left), 3 months (center), and 12 months (right) across the #Arctic... Data from https://doi.org/10.24381/cds.f17050d7

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  Check out this animation of 100 years of average September temperature anomalies over global land areas through 2026... Data from NOAAGlobalTemp v6.1.0: https://www.ncei.noaa.gov/products/land-based-station/noaa-global-temp

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  #Arctic air temperature rank by month over the satellite era - now updated through September 2026... + Ranks: 1=warmest (red), 47/48=coldest (blue) + Download higher resolution: https://zacklabe.com/arctic-temperatures/ + Data from @CopernicusECMWF: https://doi.org/10.24381/cds.f17050d7

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  Have a good week! Here's your Monday ice update - #Arctic sea ice extent is currently the 11th lowest on record (JAXA data)... • about 9,000 km² above the 2010s mean • about 1,230,000 km² below the 2000s mean • about 2,250,000 km² below the 1990s mean • about 2,550,000 km² below the 1980s mean More graphics: https://zacklabe.com/arctic-sea-ice-figures/

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  Simulated reconstruction of October #Arctic sea ice thickness since 1901. Large interannual variability and widespread thinning in recent years. Information about this data set is available at https://doi.org/10.1175/JCLI-D-19-0008.1

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  And here is the corresponding global upper ocean heat content (0 to 700 m depth) also now updated through June 2026... This graph showing anomalies is created by NOAA at https://www.ncei.noaa.gov/access/global-ocean-heat-content/

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  "The last three months were about three degrees above average, hotter than the Dust Bowl summer of 1936 and the heat dome of 2021, and tens of millions of people can’t afford to pay for the air-conditioning that helped keep them safe in the deadly heat." via https://www.nytimes.com/2026/10/18/us/oklahoma-extreme-heat-electricity-crisis.html?unlocked_article_code=1.JlE.ZbDI.sNsHY3XUGHJV&smid=nytcore-ios-share

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  Check this out! These maps show temperature anomalies averaged by decade in the #Arctic for the month of October. This month is one of the fast warming for Arctic amplification trends. Heat is being transferred back into the overlying atmosphere from newly open water. Data: https://doi.org/10.24381/cds.f17050d7.

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  "September 2026 was the warmest September on record for the contiguous U.S. Records have been maintained since 1895." Note that this was especially driven by unusually warm nights. ➡️ Our latest monthly climate report (Global and U.S. data+graphics): https://climatecentral.org/climate-briefings/september-2026

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  September #Arctic sea ice extent since 1850 - comparison now updated through 2026 Please note that the reconstruction (SIBT1850 v2) is for the 15th of September, while the NSIDC is a monthly mean. You can read more about this data set at https://doi.org/10.7265/jj4s-tq79

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  The disappearance of thicker #Arctic sea ice by decade in October... More info on this data: https://climatedataguide.ucar.edu/climate-data/pan-arctic-ice-ocean-modeling-and-assimilation-system-piomas

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  October has observed some of the largest warming trends in the #Arctic (satellite-era). This is greatest over areas with a lack of sea ice cover (nearly all of the Siberian Arctic). Arctic amplification is largest in the boreal fall. Data: https://doi.org/10.24381/cds.f17050d7. Info: https://doi.org/10.1175/BAMS-D-26-0123.1