Custer County Weather in May
Average highs run from 66°F on May 1 to 76°F on May 31, and lows from 35°F to 46°F. Normal precipitation for the month is 2.92 in over about 11 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 71°F
- Average low
- 41°F
- Precipitation
- 2.92 in
- Snowfall
- 0.8 in
- Record high
- 100°FMay 29, 1988
- Record low
- 15°FMay 3, 1954
- Chance of a freeze
- 97%
- Days of 90°F or more
- 0.6
- Daylight
- 14 h 23 min to 15 h 31 min
- Cloud cover
- 65%
- Humidity
- 55%
- Dew point
- 38°F
- Wind
- 11.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| May 1 | 66°F | 35°F | 89°F 1955 | 21°F 2013 | 31% | 2% |
| May 2 | 66°F | 36°F | 90°F 1985 | 18°F 1954 | 31% | 2% |
| May 3 | 66°F | 36°F | 89°F 1986 | 15°F 1954 | 31% | 2% |
| May 4 | 67°F | 36°F | 88°F 1939 | 24°F 1967 | 31% | 2% |
| May 5 | 67°F | 37°F | 89°F 1966 | 27°F 1967 | 32% | 2% |
| May 6 | 68°F | 37°F | 90°F 1966 | 21°F 2026 | 32% | 2% |
| May 7 | 68°F | 37°F | 90°F 1992 | 25°F 1984 | 32% | 2% |
| May 8 | 68°F | 38°F | 90°F 1987 | 18°F 1945 | 32% | 2% |
| May 9 | 69°F | 38°F | 89°F 1977 | 26°F 2019 | 32% | 2% |
| May 10 | 69°F | 38°F | 90°F 2025 | 23°F 1979 | 32% | 2% |
| May 11 | 69°F | 39°F | 92°F 1958 | 23°F 1953 | 33% | 1% |
| May 12 | 70°F | 39°F | 96°F 1960 | 23°F 2004 | 33% | 1% |
| May 13 | 70°F | 40°F | 97°F 2001 | 17°F 2004 | 33% | 1% |
| May 14 | 70°F | 40°F | 88°F 1987 | 27°F 2005 | 33% | 1% |
| May 15 | 71°F | 40°F | 94°F 1978 | 32°F 1945 | 33% | 1% |
| May 16 | 71°F | 41°F | 91°F 2012 | 31°F 1968 | 34% | 1% |
| May 17 | 71°F | 41°F | 92°F 1972 | 31°F 2002 | 34% | 1% |
| May 18 | 72°F | 42°F | 98°F 1948 | 30°F 2015 | 34% | 1% |
| May 19 | 72°F | 42°F | 94°F 1992 | 25°F 2026 | 34% | 1% |
| May 20 | 72°F | 42°F | 99°F 1964 | 30°F 2003 | 35% | 1% |
| May 21 | 73°F | 43°F | 96°F 1980 | 29°F 1963 | 35% | 1% |
| May 22 | 73°F | 43°F | 99°F 1980 | 28°F 2022 | 35% | 1% |
| May 23 | 73°F | 44°F | 96°F 1980 | 30°F 1947 | 35% | 1% |
| May 24 | 74°F | 44°F | 95°F 1985 | 32°F 2002 | 36% | 1% |
| May 25 | 74°F | 44°F | 92°F 2026 | 32°F 2004 | 36% | 1% |
| May 26 | 74°F | 45°F | 98°F 1969 | 32°F 2007 | 36% | 0% |
| May 27 | 75°F | 45°F | 96°F 1969 | 30°F 1965 | 36% | 0% |
| May 28 | 75°F | 45°F | 95°F 1937 | 24°F 1947 | 36% | 0% |
| May 29 | 75°F | 46°F | 100°F 1988 | 31°F 1947 | 36% | 0% |
| May 30 | 76°F | 46°F | 98°F 1984 | 36°F 1982 | 36% | 0% |
| May 31 | 76°F | 46°F | 92°F 1966 | 32°F 1954 | 37% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 5:48 AM, sunset 8:11 PM
- May 31
- sunrise 5:15 AM, sunset 8:46 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00245754 (Mizpah 4 Nnw), public domain. Records: NOAA GHCN-Daily, station USW00024037, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.