Casper, WY: records

4 October 2026: The hottest day on record in Casper, WY: 104°F on Saturday 29 July 2006, Saturday 16 July 2005 and Monday 12 July 1954.

The record begins: 1939

All-time records

Hottest day: 104°F; 29 July 2006, 16 July 2005, 12 July 1954
Coldest night: -42°F; 22 December 2022
Wettest day: 2.80 in; 13 April 1941
Warmest night: 74°F; 18 July 2006
Coldest day: -25°F; 3 February 1989

Daily records by decade

New daily records set in Casper, WY by decade since the 1960s: the most record highs, 119, came in the 1980s; the most record lows, 107, in the 1970s.

Record highs
Record lows

Every decade as a table

Decade	Record highs	Record lows	Years in the record
1930s	0	0	1
1940s	0	0	10
1950s	0	0	10
1960s	13	21	10
1970s	77	107	10
1980s	119	86	10
1990s	113	42	10
2000s	91	67	10
2010s	55	47	10
2020s	68	38	7

Records by month

Month	Highest	Lowest	Wettest day
January	60°F 30 January 1971	-40°F 14 January 1972, 13 January 1972, 24 January 1949	0.55 in 11 January 2023
February	68°F 21 February 1982	-32°F 17 February 2006	0.59 in 14 February 1995
March	83°F 21 March 2026	-25°F 10 March 2022	1.08 in 31 March 2017
April	84°F 30 April 2021, 30 April 1992	-6°F 12 April 1997	2.80 in 13 April 1941
May	95°F 29 May 2003	16°F 12 May 1953	2.22 in 17 May 2000
June	102°F 30 June 1990, 24 June 1988	25°F 10 June 2019	2.15 in 19 June 1986
July	104°F 29 July 2006, 16 July 2005, 12 July 1954	30°F 4 July 1972	1.78 in 22 July 1983
August	103°F 2 August 2026	29°F 23 August 2015	2.21 in 2 August 2007
September	100°F 4 September 2022	15°F 28 September 1945	2.01 in 20 September 1989
October	87°F 5 October 1993, 1 October 1992	-9°F 30 October 2019, 29 October 2019	2.06 in 16 October 1998
November	73°F 4 November 2020	-27°F 12 November 2014	0.99 in 2 November 1994
December	66°F 2 December 2021	-42°F 22 December 2022	1.26 in 24 December 1982

Streaks, months and years

Longest heat streak	20 days	10 July to 29 July 2026	A high of 90°F or above
Longest cold streak	26 days	15 January to 9 February 1949	A high of 32°F or below
Wettest month	6.46 in	May 1978
Driest month	a trace	October 1965	and 2 more
Wettest year	20.48 in	1982
Driest year	5.79 in	2020

Every record in words

The coldest night on record in Casper, WY: a low of -42°F on Thursday 22 December 2022.
The wettest day on record in Casper, WY: 2.80 in on Sunday 13 April 1941.
The warmest night on record in Casper, WY: a low of 74°F on Tuesday 18 July 2006.
The coldest day on record in Casper, WY: a high of -25°F on Friday 3 February 1989.
The longest run of days with a high of 90°F or above in Casper, WY: 20 days, from Friday 10 July to Wednesday 29 July 2026.
The longest run of days with a high of 32°F or below in Casper, WY: 26 days, from Saturday 15 January to Wednesday 9 February 1949.
The wettest month on record in Casper, WY: May 1978, with 6.46 in of precipitation.
The driest month on record in Casper, WY: October 1965, with a trace of precipitation (shared with 2 other months).
The wettest year on record in Casper, WY: 1982, with 20.48 in of precipitation.
The driest year on record in Casper, WY: 2020, with 5.79 in of precipitation.

Casper, WY the day's answers