November 2025 Summary – Cooler and Drier Than Average

Blue Hill Observatory November 2025 Summary: 

November 2025 was cooler than normal with less precipitation and more sunshine than average. The approximated 24-hour mean temperature for the month of 41.2 deg F was 0.5 degrees warmer than the 1891-2020 130-year average for November, and it was 0.9 degrees cooler than the 1991-2020 30-year average. The average maximum temperature of 48.7 deg F was 1.4 degrees cooler than the 30-year normal, and the average minimum temperature of 33.8 deg F was equal to the 30-year normal. The highest temperature for the month was 61F on the 9th, and the lowest temperature was 27F on the 19th, 20th, and 29th. The first freeze of the season occurred on the 7th, which tied as the eighth latest on record. November mean water vapor pressure, which is an absolute measure of water vapor in the air, was 6.5 mb, which corresponded to a mean dew point of about 34F. This amount was below the long-term mean water vapor pressure for November of 7.0 mb, which equals a mean dew point of about 35F. The total precipitation was 2.15 inches, which was 2.16 inches less than the 30-year normal. There were no significant storms during the month, and the greatest rainfall in 24 hours was 0.56 inches on the 15th-16th. The first measurable frozen precipitation of the season was observed as 0.1 inches of sleet during the evening of the 15th. There were no thunderstorm day during the month. The lowest sea-level pressure was 29.09 inches during the storm on the 16th, and the highest sea-level pressure was 30.52 inches on the 29th. The mean wind speed was 12.6 mph, and the prevailing wind direction was from the west-northwest. The highest wind gust was 52 mph from the northwest on the 4th. November sunshine was above average with 148.7 hours of bright sunshine, or 52 percent of possible, which was four percent more than the long-term average for the month.

BHO Latest First Freeze, (1885-2025):

1) 15 Nov 1938
2) 12 Nov 1943
   12 Nov 1977
4) 11 Nov 1994
5) 10 Nov 1956
6) 9 Nov, 2017
   9 Nov 2022
8) 7 Nov 1971
   7 Nov 2025

Mike Iacono
Chief Scientist
Blue Hill Observatory