All-time weather records — Portsmouth, OH

Record high
107.1°F
July 28, 1930
Record low
-29.0°F
January 19, 1994
Wettest day
6.57 in
September 28, 2024

Climate change signal in Portsmouth

4.1%

of Portsmouth's all-time daily heat records were set in the last decade (15 of 366 records since 2015).

5.2%

of all-time daily cold records were set in the last decade (19 of 366 records since 2015).

If records were spread evenly across the station's history, you'd expect roughly 5% per decade. Decade-by-decade, here's where each record-breaking day was set:

Decade Heat records set # Cold records set #
1890s
61
24
1900s
19
27
1910s
40
53
1920s
41
37
1930s
76
24
1940s
25
15
1950s
22
8
1960s
11
18
1970s
12
19
1980s
19
98
1990s
10
15
2000s
9
7
2010s
11
16
2020s
10
5

Records are the all-time daily extremes that are still standing — each daily record can only be held by one year. The station's earliest hot record was set in 1893, the latest in 2026. Period of observation: 1893-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 79.0°F — Jan 25, 1950 -29.0°F — Jan 19, 1994 2.52 in — Jan 8, 1998
February 79.0°F — Feb 15, 1945 -18.0°F — Feb 10, 1899 3.40 in — Feb 24, 1909
March 96.1°F — Mar 23, 1907 0.0°F — Mar 3, 1980 3.74 in — Mar 2, 1997
April 97.0°F — Apr 24, 1925 1.0°F — Apr 6, 1982 4.42 in — Apr 15, 1939
May 99.0°F — May 29, 1914 28.0°F — May 4, 1986 3.10 in — May 3, 2010
June 102.9°F — Jun 28, 1934 37.9°F — Jun 10, 1988 3.07 in — Jun 22, 1909
July 107.1°F — Jul 28, 1930 35.1°F — Jul 10, 2022 5.02 in — Jul 2, 1938
August 105.1°F — Aug 4, 1930 28.0°F — Aug 29, 1982 3.83 in — Aug 7, 1947
September 102.9°F — Sep 7, 1954 28.0°F — Sep 25, 1913 6.57 in — Sep 28, 2024
October 98.1°F — Oct 17, 1926 18.0°F — Oct 30, 1895 3.53 in — Oct 13, 1893
November 84.9°F — Nov 1, 1935 1.9°F — Nov 25, 1950 3.00 in — Nov 8, 1897
December 75.9°F — Dec 11, 1971 -18.0°F — Dec 23, 1989 3.30 in — Dec 24, 1921

Click a month to see every daily record for that month in Portsmouth.