Delta Weather in May
Average highs run from 69°F on May 1 to 81°F on May 31, and lows from 37°F to 45°F. Normal precipitation for the month is 0.92 in over about 6 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
- 76°F
- Average low
- 41°F
- Precipitation
- 0.92 in
- Record high
- 103°FMay 29, 2003
- Record low
- 15°FMay 2, 2008
- Chance of a freeze
- 86%
- Days of 90°F or more
- 2.8
- Daylight
- 13 h 53 min to 14 h 45 min
- Cloud cover
- 52%
- Humidity
- 45%
- Dew point
- 33°F
- Wind
- 7.8 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 | 69°F | 37°F | 88°F 1943 | 17°F 2011 | 20% | 2% |
| May 2 | 70°F | 37°F | 88°F 1947 | 15°F 2008 | 20% | 2% |
| May 3 | 70°F | 37°F | 92°F 1947 | 21°F 2008 | 20% | 2% |
| May 4 | 71°F | 37°F | 92°F 1947 | 22°F 2001 | 20% | 1% |
| May 5 | 71°F | 38°F | 91°F 1947 | 23°F 1961 | 20% | 1% |
| May 6 | 71°F | 38°F | 91°F 2021 | 24°F 2003 | 20% | 1% |
| May 7 | 72°F | 38°F | 90°F 1989 | 23°F 1984 | 20% | 1% |
| May 8 | 72°F | 39°F | 88°F 1974 | 22°F 2002 | 20% | 1% |
| May 9 | 73°F | 39°F | 93°F 2001 | 19°F 2002 | 20% | 1% |
| May 10 | 73°F | 39°F | 89°F 1941 | 27°F 1953 | 20% | 1% |
| May 11 | 74°F | 40°F | 95°F 2026 | 23°F 1953 | 20% | 1% |
| May 12 | 74°F | 40°F | 98°F 2026 | 25°F 2000 | 20% | 1% |
| May 13 | 74°F | 40°F | 94°F 2013 | 28°F 1942 | 20% | 1% |
| May 14 | 75°F | 40°F | 92°F 2013 | 27°F 1942 | 20% | 1% |
| May 15 | 75°F | 41°F | 90°F 1996 | 31°F 1967 | 20% | 0% |
| May 16 | 76°F | 41°F | 93°F 2006 | 29°F 1955 | 20% | 0% |
| May 17 | 76°F | 41°F | 94°F 2006 | 27°F 1943 | 20% | 0% |
| May 18 | 76°F | 42°F | 98°F 2009 | 28°F 1971 | 19% | 0% |
| May 19 | 77°F | 42°F | 94°F 2008 | 28°F 1971 | 19% | 0% |
| May 20 | 77°F | 42°F | 96°F 2008 | 27°F 2003 | 19% | 0% |
| May 21 | 78°F | 42°F | 94°F 2012 | 27°F 2022 | 19% | 0% |
| May 22 | 78°F | 43°F | 95°F 2012 | 26°F 2002 | 19% | 0% |
| May 23 | 78°F | 43°F | 97°F 2003 | 31°F 2013 | 19% | 0% |
| May 24 | 79°F | 43°F | 98°F 2001 | 25°F 2002 | 19% | 0% |
| May 25 | 79°F | 43°F | 98°F 2001 | 31°F 1978 | 19% | 0% |
| May 26 | 80°F | 44°F | 95°F 2001 | 30°F 2004 | 18% | 0% |
| May 27 | 80°F | 44°F | 94°F 1951 | 33°F 1942 | 18% | 0% |
| May 28 | 80°F | 44°F | 100°F 2003 | 31°F 2012 | 18% | 0% |
| May 29 | 81°F | 44°F | 103°F 2003 | 27°F 2006 | 18% | 0% |
| May 30 | 81°F | 45°F | 100°F 2002 | 27°F 2004 | 17% | 0% |
| May 31 | 81°F | 45°F | 102°F 2002 | 31°F 1978 | 17% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (MDT).
- May 1
- sunrise 6:31 AM, sunset 8:24 PM
- May 31
- sunrise 6:06 AM, sunset 8:51 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00023162 (Delta), public domain. Records: NOAA GHCN-Daily, station USW00023162, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.