All-time weather records — Castlewood, SD

Record high
100.9°F
July 17, 2012
Record low
-35.0°F
December 18, 2016
Wettest day
5.61 in
July 28, 2025

Climate change signal in Castlewood

69.9%

of Castlewood's all-time daily heat records were set in the last decade (256 of 366 records since 2015).

67.2%

of all-time daily cold records were set in the last decade (246 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 #
2010s
208
234
2020s
158
132

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 2011, the latest in 2026. Period of observation: 2011-2026.

Records by month

Month Hottest day Coldest day Wettest day
January 57.9°F — Jan 6, 2012 -34.1°F — Jan 31, 2019 0.34 in — Jan 28, 2019
February 64.0°F — Feb 22, 2017 -29.9°F — Feb 15, 2021 0.63 in — Feb 9, 2020
March 82.0°F — Mar 19, 2012 -20.0°F — Mar 2, 2014 1.36 in — Mar 14, 2019
April 86.0°F — Apr 14, 2024 -4.0°F — Apr 5, 2018 1.88 in — Apr 11, 2019
May 98.1°F — May 28, 2018 18.0°F — May 3, 2013 2.04 in — May 12, 2022
June 100.0°F — Jun 6, 2021 37.9°F — Jun 1, 2017 2.41 in — Jun 29, 2025
July 100.9°F — Jul 17, 2012 39.9°F — Jul 28, 2013 5.61 in — Jul 28, 2025
August 99.0°F — Aug 2, 2012 37.9°F — Aug 17, 2012 2.50 in — Aug 19, 2016
September 98.1°F — Sep 4, 2023 21.0°F — Sep 23, 2012 2.40 in — Sep 24, 2017
October 91.0°F — Oct 2, 2023 3.9°F — Oct 27, 2020 2.31 in — Oct 15, 2013
November 77.0°F — Nov 5, 2020 -16.1°F — Nov 27, 2014 1.73 in — Nov 19, 2024
December 59.0°F — Dec 8, 2023 -35.0°F — Dec 18, 2016 3.00 in — Dec 26, 2015

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