Rock Springs weather in May: Rock Springs, Wyoming: normal highs, lows, rain and records for May
Rock Springs in May has a normal high of 63°F and a normal low of 38°F, a daily mean of 51°F, rising from 57°F on the 1st to 69°F by the 31st. Measurable precipitation falls on 9 days in a normal May, 1.27 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 17°C and low of 4°C, 32 mm of precipitation and 7 cm of snow in May.
- NOAA stationRock Springs Airport
- Station IDUSW00024027
- Location41.59°N 109.05°W
- Elevation6,741 ft (2,055 m)
- Population22,967
- Jan 30° 14°
- Feb 33° 16°
- Mar 44° 24°
- Apr 53° 30°
- May 63° 38°
- Jun 75° 47°
- Jul 84° 55°
- Aug 82° 53°
- Sep 71° 44°
- Oct 56° 33°
- Nov 41° 22°
- Dec 30° 13°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Rock Springs in May?
The normal high is 63°F and the normal low 38°F, for a daily mean of 50.8°F. May is 9.6°F warmer than April and 10.2°F cooler than June. May is the 5th warmest month of the year in Rock Springs and the wettest. Across the month the normal high rises 12°F, from 57°F on May 1 to 69°F on May 31. From one year to the next May's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Mays in three average between 48°F and 54°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 29%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 57°F | 33°F | 28% | 11% |
| May 8 | 60°F | 36°F | 29% | 12% |
| May 15 | 63°F | 38°F | 28% | 12% |
| May 22 | 66°F | 41°F | 28% | 12% |
| May 31 | 69°F | 43°F | 25% | 11% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 57°F | 33°F | 28% | 11% | 14 h |
| May 2 | 58°F | 34°F | 28% | 11% | 14 h |
| May 3 | 58°F | 34°F | 28% | 12% | 14 h |
| May 4 | 58°F | 34°F | 28% | 12% | 14 h 10 min |
| May 5 | 59°F | 35°F | 28% | 12% | 14 h 10 min |
| May 6 | 59°F | 35°F | 28% | 12% | 14 h 10 min |
| May 7 | 60°F | 35°F | 29% | 12% | 14 h 10 min |
| May 8 | 60°F | 36°F | 29% | 12% | 14 h 10 min |
| May 9 | 60°F | 36°F | 29% | 12% | 14 h 20 min |
| May 10 | 61°F | 37°F | 29% | 12% | 14 h 20 min |
| May 11 | 61°F | 37°F | 28% | 12% | 14 h 20 min |
| May 12 | 62°F | 37°F | 28% | 12% | 14 h 20 min |
| May 13 | 62°F | 38°F | 28% | 12% | 14 h 30 min |
| May 14 | 62°F | 38°F | 28% | 12% | 14 h 30 min |
| May 15 | 63°F | 38°F | 28% | 12% | 14 h 30 min |
| May 16 | 63°F | 39°F | 28% | 12% | 14 h 30 min |
| May 17 | 64°F | 39°F | 28% | 12% | 14 h 30 min |
| May 18 | 64°F | 39°F | 28% | 12% | 14 h 40 min |
| May 19 | 64°F | 40°F | 28% | 12% | 14 h 40 min |
| May 20 | 65°F | 40°F | 28% | 12% | 14 h 40 min |
| May 21 | 65°F | 40°F | 28% | 12% | 14 h 40 min |
| May 22 | 66°F | 41°F | 28% | 12% | 14 h 40 min |
| May 23 | 66°F | 41°F | 27% | 12% | 14 h 40 min |
| May 24 | 66°F | 41°F | 27% | 12% | 14 h 50 min |
| May 25 | 67°F | 41°F | 27% | 12% | 14 h 50 min |
| May 26 | 67°F | 42°F | 27% | 12% | 14 h 50 min |
| May 27 | 68°F | 42°F | 27% | 12% | 14 h 50 min |
| May 28 | 68°F | 42°F | 26% | 11% | 14 h 50 min |
| May 29 | 68°F | 42°F | 26% | 11% | 14 h 50 min |
| May 30 | 69°F | 43°F | 26% | 11% | 15 h |
| May 31 | 69°F | 43°F | 25% | 11% | 15 h |
- Normal high
- 63°FMay average
- Normal low
- 38°FMay average
- Precipitation
- 1.27 inmonth total
- Days with precipitation
- 90.01 inch or more
- Snowfall
- 2.7 inmonth total
- Nights at 32°F or colder
- 7
- Daylight
- 14 h to 15 hMay 1 to May 31
- Days at 70°F or more
- 10
- Days at 80°F or more
- 2
- Sunshine
- 78%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024027; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain or snow in Rock Springs in May?
On a given May day the chance of 0.01 inch or more is 28% on average, highest around May 7 (29%). In all, 1.27 in falls on 9 days of a normal May.
In a normal May in Rock Springs, 7 nights fall to freezing and snowfall averages 2.7 inches.
Snow falls on 2 days in a normal May.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024027.
How humid and windy is Rock Springs in May?
At 3 p.m. the normal temperature is 66°F with 25% relative humidity and a dew point of 29°F; at 6 a.m. it is 46°F with 62% humidity. The wind averages 11.0 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 46°F | 34°F | 62% | 6.9 mph | 72% |
| 9 a.m. | 57°F | 35°F | 43% | 9.9 mph | 72% |
| noon | 65°F | 31°F | 28% | 13.4 mph | 63% |
| 3 p.m. | 66°F | 29°F | 25% | 16.4 mph | 56% |
| 6 p.m. | 63°F | 30°F | 29% | 15.1 mph | 57% |
| 9 p.m. | 55°F | 31°F | 41% | 10.2 mph | 66% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024027. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in Rock Springs?
The warmest May temperature on this station's record (since 1948) is 90°F, on May 31, 2002; the coldest is 14°F, on May 1, 1967. The wettest May brought 3.67 in (1995); the snowiest, 12.0 inches (1978).
The May mean against the 1991-2020 normal of 50.8°F: 2021 51.4°F (+0.6), 2022 47.9°F (−2.9), 2023 54.3°F (+3.5), 2024 48.6°F (−2.1), 2025 53.6°F (+2.8), 2026 51.9°F (+1.1). 4 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 51.4°F | +0.6°F | 0.36 in |
| 2022 | 47.9°F | −2.9°F | 0.64 in |
| 2023 | 54.3°F | +3.5°F | 0.58 in |
| 2024 | 48.6°F | −2.1°F | 0.80 in |
| 2025 | 53.6°F | +2.8°F | 0.34 in |
| 2026 | 51.9°F | +1.1°F | 0.40 in |
Source: records: ACIS, station USW00024027; recent months: ACIS, station USW00024027. Records and recent months use complete months only.
How does May in Rock Springs compare across Wyoming?
Across the 71 places PlainClimate covers in Wyoming, May normal highs run from 55°F in Sundance to 73°F in Basin; Rock Springs's is 63°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.