The main purpose of this ongoing blog will be to track planetary extreme, or record temperatures related to climate change. Any reports I see of ETs will be listed below the main topic of the day. I’ll refer to extreme or record temperatures as ETs (not extraterrestrials).😉
Main Topic: U.S. May 2025 Record Scoreboard and Climatological Review
Dear Diary. It’s time for our monthly climatological review. Here on this site, we usually present monthly summaries near the 10th of each month, and each is available by clicking the link below:
https://guyonclimate.com/category/record-scoreboard-climatological-reviews
I’m repeating this mantra every month:
May 2025 got ranked by the National Center for Environmental Information for the lower 48 states as 26th warmest or 106th coolest since records began being kept in 1895 at +1.53°F above the 1901-2000 average.
The above data was from:
https://www.ncdc.noaa.gov/cag/national/rankings
During May the warmest conditions were in the western, eastern and southern portions of the nation. Oklahoma was the only state that saw below average temperatures. Most reports of record chill came from the Midwest. Most reports of record warmth occurred early and late in the month and came from the Southwest and south-central states plus Florida.
You can check out record totals for yourself on my NCEI record archives:
NCEI Record Count Archive – Guy On Climate
Here are my two U.S. Daily Record Scoreboards updated through 6/09/2025 (data compiled from the following NCEI site):
https://www.ncdc.noaa.gov/cdo-web/datatools/records
I’m also keeping tabs on record report totals to verify a scientific study I helped to complete in the decade of the 2000s. We’ll eventually see how skewed ratios of record warm to cold reports get by the year 2100, which the study mentions as 50-1 for DHMX vs. DLMN:
DHMX= Daily High Max Reports. DLMN= Daily Low Min Reports. DHMN= Daily High Min Reports. DLMX=Daily Low Max Reports.
Boldly highlighted red, blue, or purple colored months, such as December 2023 and June 2021, that have ratios of >10 to 1 daily or <1 to 10 of daily warm to low records are either historically hot or cold, most of which have made news. NCEI rankings are for the lower 48 states with the warmest ranking since 1895 of average temperatures being 131 and 1 being the coldest as of 2025. Blue colors represent cold months and red warm. Those months and years with counts close to a 1 to 1 ratio of highs to lows are colored black. All-time record hottest or coldest months and years are boldly colored in purple. NCDC rankings have been color coded (under tabs in each file) such that values of 55 to 75 are black representing neutral months or years (+ or – 10 from the average ranking of 64).
Totals are record reports for the entire United States including all territories minus those from Alaska. I’ve subtracted those from Alaska to get a better representation of what has occurred across the lower 48 states in association with lower 48 state rankings.
May 2025 had approximately a 22 to 3 ratio of record DHMX to DLMN individual record counts, so the color I used for that month was dark red on the top chart.
May 2025 had approximately a 31 to 18 ratio of record DHMN to DLMX individual record counts, so the color I used for that month was red on the bottom chart.
Due to climate change, we are seeing fewer blue colors on these Record Scoreboards with time.
The average temperature lower 48 state ranking for May 2025 was 106, which was colored red since it was warmer than average. We are seeing fewer blue colors on my charts, and May 2025 was yet another red or warm month.
I color rankings of +10 to -10 from the average ranking for the lower 48 states of 65 black, indicating that these are near average temperature wise. The top warmest ranking for 2024 would be 130 since rankings began in 1895.
Looking at the type and number of record reports, June 2025 has gotten off to a warm start, and meteorological models are consistently forecasting an above average June for temperatures. Will we see a historic top 10 warmest June? Stay tuned.
Interestingly, here is what we see as far as overall yearly ratios go for the 2020s so far. Warmth is key here:
Here is much more detailed climatology for the May 2025 as complied by NOAA:
https://www.ncei.noaa.gov/news/national-climate-202505
Assessing the U.S. Climate in May 2025
May brought storms and heavy rain from the South to the Northeast; spring was the second warmest on record
Published
June 9, 2025
Related Links
May 2025 U.S.Climate Report (Available June 12, 2025)
National Temperature and Precipitation Maps
Climatological Rankings Explained
State of the Climate Summaries
Key Points:
- Thirteen states experienced one of their five wettest Mays on record, while dry conditions persisted across much of the Northwest.
- Two significant severe weather outbreaks on May 15–16 and May 18–20 resulted in over 200 tornado reports, very large hail and damaging winds.
- Alaska had its second-wettest May on record with exceptionally heavy rainfall in the Southeast.
Several sites across Hawai`i observed their warmest spring on record. - Widespread drought improvement occurred along the East Coast and across much of the Plains.
Map of the U.S. selected significant climate anomalies and events in May 2025.
Other Highlights:
Temperature
Map of the U.S. showing temperature departures from average for May 2025 with warmer areas in gradients of red and cooler areas in gradients of blue.
The average temperature for the contiguous U.S. (CONUS) in May 2025 was 61.7°F, 1.5°F above the 20th-century average, ranking in the warmest third of the 131-year period of record. Much of the West, Southwest and Northwest, as well as the northern Rockies and Plains, recorded above-average temperatures. Warmer-than-normal conditions also extended along the southern Gulf Coast from Texas to Florida and up the entire Atlantic seaboard. Florida experienced its second-warmest May on record at 4.0°F above average. In contrast, temperatures across the central U.S. were generally near- to below-average.
During meteorological spring (March–May) 2025, the CONUS average temperature was 54.1°F, 3.2°F above average, making it the second-warmest spring in the 131-year record. North Carolina recorded its second-warmest spring (3.7°F above average), while Georgia, Louisiana, Maryland, Mississippi and Virginia each matched or exceeded their third-warmest spring on record.
Alaska’s average temperature for May was 39.0°F, 1.2°F above the long-term average, ranking in the middle third of the 101-year record. For the spring season (March–May), Alaska’s average temperature was 27.7°F, 3.7°F above average, ranking in the warmest third of the historical record.
Hawai`i was warmer than average in May, with several stations reporting record average temperatures for the month. Spring ranked as the warmest on record at multiple sites, including the Honolulu International and Moloka`i airports.
Precipitation
May 2025 U.S. Total Precipitation Percentiles
The average precipitation across the CONUS in May was 3.63 inches, which is 0.72 inch above the 20th-century average, ranking in the wettest third of the 131-year record. Much of the Southeast and Northeast experienced notably wet conditions, with the Southeast region recording its second-wettest May and the Northeast its third-wettest. Alabama had its wettest May on record—its first with more than 10 inches of rainfall—while Maryland, Pennsylvania, Rhode Island and Vermont each recorded their second wettest. Precipitation was also above average in parts of the Southwest and northern Plains, while drier-than-average conditions prevailed along portions of the Pacific Coast, the Northwest and the upper Mississippi Valley.
During spring, the CONUS received an average of 8.90 inches of precipitation, 0.97 inch above the long-term average, ranking in the wettest third of the 131-year record. Much-above-average precipitation fell across parts of the southern Plains, South, Ohio Valley and Northeast, as well as in portions of the northern Plains and upper Great Lakes. In contrast, below-average precipitation was observed in parts of the Mountain West, central Plains and across the Florida Peninsula.
Alaska experienced its second-wettest May on record, largely due to exceptionally heavy rainfall in the Southeast region, where many long-term stations set new monthly precipitation records. Alaska also tied its second-wettest spring on record, despite some parts of the West Coast and western Aleutians being drier than average.
Drought
According to the June 3 U.S. Drought Monitor report, about 29.6% of the contiguous U.S. was in drought, a decrease of approximately 7.4% since the end of April. Drought conditions contracted or decreased in intensity along much of the East Coast, from Florida to the Northeast. Improvements were also observed in parts of the Southwest and across sections of the southern, central and northern Plains. In contrast, drought developed or intensified across parts of the Northwest, central Rockies, middle Mississippi Valley and Great Lakes regions. In Hawai`i, drought conditions improved over the western islands but intensified over the Big Island.
Monthly Outlook
Above-average temperatures are expected across much of the Lower 48 in June, particularly in parts of the Northwest and Northeast. In contrast, below-average temperatures are favored in Alaska. Lower-than-average precipitation is favored in the Northwest, while wetter-than-average conditions are expected across parts of the Southwest, central Plains and extending into the South and Southeast.
Drought is expected to persist across much of the Southwest and parts of the central and northern Plains, with additional further development likely in portions of the Pacific West, Northwest and northern Rockies. Some drought improvement is anticipated in parts of Florida and along the Mid-Atlantic Coast.
Visit the Climate Prediction Center’s Official 30-Day Forecasts and U.S. Monthly Drought Outlook website for more details.
Here are more “ETs” recorded from around the planet the last couple of days, their consequences, and some extreme temperature outlooks, as well as any extreme precipitation reports:
Here is More Climate News from Monday:
(As usual, this will be a fluid post in which more information gets added during the day as it crosses my radar, crediting all who have put it on-line. Items will be archived on this site for posterity. In most instances click on the pictures of each tweet to see each article. The most noteworthy items will be listed first.)