Portland Maine’s All-Time Annual Records
Updated 1-15-11
Temperature records since November 25, 1940
Precipitation records since January 15, 1871
Snowfall records since January 1, 1882
Sea Level Pressure records since Feb. 1871
Daily Temperature Records:
Warmest Temperature…….. 103 degrees on August 2, 1975
Coldest Temperature……… -39 degrees on February 16, 1943
Warmest Low……………... 74 degrees on July 17, 1969,
August 5, 1988 & August 2, 2006
Coldest High………………. -3 degrees January 15, 1957
Warmest Average………… . 88 degrees on August 2, 1975
Coldest Average…………… -16 degrees on February 15th & 16th, 1943
Greatest Range…………….. 54 degrees on March 29, 1946
Smallest Range……………. 1 degree on Februay 8, 1971 &
March 22, 1945
Monthly Temperature Records:
Warmest Month….....……. 72.4 degrees - July 1974
Coldest Month…..……….. 12.2 degrees - January 1971
Warmest Average High….. 84.7 degrees - July 1952
Coldest Average High…… 23.1 degrees - January 1971
Warmest Average Low…... 62.6 degrees - July 2006
Coldest Average Low……. 1.2 degrees - January 1971
Greatest Range…………… 95 degrees - Feb. 1943 (max 56, min -39)
Smallest Range…………... 30 degrees - July 2004 (max 82, min 52)
Daily Precipitation Records:
24 Hour Maximum……… 13.32 inches - October 20th-21st, 1996
Daily Snowfall Records:
24 Hour Maximum……… 24.4 inches - January 17th-18th, 1979
Monthly Precipitation Records:
Wettest Month…..………. 16.86 inches - October 1996
Second Wettest Month….. 15.22 inches - August 1991
Driest Month….………… 0.04 inches - February 1987
Most Days with Pcpn….… 25 in January 1950 (T or more)
Least Days with Pcpn…… 3 in Feb. 1872 & Aug. 1876
(trace or more)
Monthly Snowfall Records:
Most Snow………………. 62.4 inches in Januray 1979
Least Snow……………… 0.0 inches
Most Consecutive Days:
Precipitation (trace or more)… 16 – May 9th-24th, 2006
Second Most Pcpn (t or more) … 14 - January 7th-20th, 1975;
May 18th-31st, 1979 &
November 2nd-15th, 1969
Measurable Precipitation……. 14 - November 2nd-15th, 1969
No Precipitation (T or more)... 17 - October 12th-28th, 1947
No Measurable Precipitation… 28 - October 1st-28th, 1947
Sea Level Pressure:
Highest………………………. 31.10 inches on February 13, 1981
Lowest……………………….. 28.40 inches on December 2, 1942
Annual Records:
Warmest Year………………. 49.2 degrees – 2010
2nd warmest year………… 48.5 degrees - 2006
Coldest Year………………… 43.3 degrees - 1962
Wettest Year………………… 66.45 inches - 2005
Driest Year………………….. 25.27 inches - 1941
Snowiest Season…………….. 141.5 inches - 1970/1971
Least Snowiest Season……… 27.5 inches - 1979/80
Sunniest Year……………….. 1944 with 3023 hours & 18 minutes
of sunshine (68 percent of possible).
Least Sunniest Year………… 1972 with 2117 hours & 12 minutes
of sunshine (47 percent of possible)
(note – sunshine records from 1894 through 1994)
end/sjc