Big Sky weather in May: Big Sky, Montana: normal highs, lows, rain and records for May
Big Sky in May has a normal high of 58°F and a normal low of 30°F, a daily mean of 44°F, rising from 53°F on the 1st to 62°F by the 31st. Measurable precipitation falls on 13 days in a normal May, 2.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 15°C and low of −1°C, 72 mm of precipitation in May.
- NOAA stationBig Sky (2 mi WNW)
- Station IDUSC00240775
- Location45.28°N 111.33°W
- Elevation6,590 ft (2,009 m)
- Population (census place)2,388
- Jan 30° 9°
- Feb 34° 9°
- Mar 42° 17°
- Apr 48° 23°
- May 58° 30°
- Jun 67° 36°
- Jul 78° 41°
- Aug 77° 39°
- Sep 68° 33°
- Oct 53° 25°
- Nov 37° 16°
- Dec 28° 9°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Big Sky in May?
The normal high is 58°F and the normal low 30°F, for a daily mean of 44.1°F. May is 8.9°F warmer than April and 7.3°F cooler than June. May is the 5th warmest month of the year in Big Sky and the 2nd wettest. Across the month the normal high rises 9°F, from 53°F on May 1 to 62°F on May 31. From one year to the next May's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Mays in three average between 42°F and 47°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 51%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 53°F | 26°F | 40% | 24% |
| May 8 | 56°F | 28°F | 42% | 25% |
| May 15 | 58°F | 30°F | 45% | 26% |
| May 22 | 60°F | 32°F | 48% | 28% |
| May 31 | 62°F | 34°F | 51% | 30% |
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 | 53°F | 26°F | 40% | 24% | 14 h 10 min |
| May 2 | 53°F | 26°F | 40% | 24% | 14 h 20 min |
| May 3 | 54°F | 26°F | 40% | 24% | 14 h 20 min |
| May 4 | 54°F | 27°F | 41% | 24% | 14 h 20 min |
| May 5 | 54°F | 27°F | 41% | 25% | 14 h 30 min |
| May 6 | 55°F | 27°F | 41% | 25% | 14 h 30 min |
| May 7 | 55°F | 28°F | 42% | 25% | 14 h 30 min |
| May 8 | 56°F | 28°F | 42% | 25% | 14 h 30 min |
| May 9 | 56°F | 28°F | 42% | 25% | 14 h 40 min |
| May 10 | 56°F | 28°F | 43% | 26% | 14 h 40 min |
| May 11 | 57°F | 29°F | 43% | 26% | 14 h 40 min |
| May 12 | 57°F | 29°F | 44% | 26% | 14 h 40 min |
| May 13 | 57°F | 29°F | 44% | 26% | 14 h 50 min |
| May 14 | 58°F | 30°F | 44% | 26% | 14 h 50 min |
| May 15 | 58°F | 30°F | 45% | 26% | 14 h 50 min |
| May 16 | 58°F | 30°F | 45% | 27% | 14 h 50 min |
| May 17 | 59°F | 31°F | 46% | 27% | 14 h 50 min |
| May 18 | 59°F | 31°F | 46% | 27% | 15 h |
| May 19 | 59°F | 31°F | 47% | 27% | 15 h |
| May 20 | 60°F | 31°F | 47% | 28% | 15 h |
| May 21 | 60°F | 32°F | 48% | 28% | 15 h |
| May 22 | 60°F | 32°F | 48% | 28% | 15 h 10 min |
| May 23 | 61°F | 32°F | 49% | 28% | 15 h 10 min |
| May 24 | 61°F | 32°F | 49% | 29% | 15 h 10 min |
| May 25 | 61°F | 33°F | 49% | 29% | 15 h 10 min |
| May 26 | 61°F | 33°F | 50% | 29% | 15 h 10 min |
| May 27 | 62°F | 33°F | 50% | 29% | 15 h 20 min |
| May 28 | 62°F | 33°F | 50% | 29% | 15 h 20 min |
| May 29 | 62°F | 33°F | 50% | 29% | 15 h 20 min |
| May 30 | 62°F | 34°F | 51% | 30% | 15 h 20 min |
| May 31 | 62°F | 34°F | 51% | 30% | 15 h 20 min |
- Normal high
- 58°FMay average
- Normal low
- 30°FMay average
- Precipitation
- 2.83 inmonth total
- Days with precipitation
- 130.01 inch or more
- Nights at 32°F or colder
- 22
- Daylight
- 14 h 10 min to 15 h 20 minMay 1 to May 31
- Days at 70°F or more
- 6
- Sunshine
- 67%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00240775; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Big Sky in May?
On a given May day the chance of 0.01 inch or more is 45% on average, highest around May 31 (51%). In all, 2.83 in falls on 13 days of a normal May.
In a normal May in Big Sky, 22 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00240775.
What are the records for May in Big Sky?
The warmest May temperature on this station's record (since 1967) is 83°F, on May 29, 1986; the coldest is 8°F, on May 1, 1975. The wettest May brought 5.46 in (1991); the snowiest, 32.5 inches (2002).
Source: records: ACIS, station USC00240775. Records and recent months use complete months only.
How does May in Big Sky compare across Montana?
Across the 141 places PlainClimate covers in Montana, May normal highs run from 54°F in Cooke City to 72°F in Savage; Big Sky's is 58°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.