Big Sky climate

Big Sky Weather in May

NOAA 1991-2020 normals for Big Sky 2WNW, 3.4 km from Big Sky

Average highs run from 53°F on May 1 to 62°F on May 31, and lows from 26°F to 34°F. Normal precipitation for the month is 2.83 in over about 13 wet days.

May day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Big Sky, in °F, with the record for each date.020406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

May at a glance

Average high
58°F
Average low
30°F
Precipitation
2.83 in
Snowfall
1.3 in
Record high
94°FMay 28, 1919
Record low
12°FMay 9, 2002
Chance of a freeze
100%
Daylight
14 h 18 min to 15 h 24 min
Cloud cover
71%
Humidity
69%
Dew point
33°F
Wind
5.4 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.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
May 153°F26°F83°F 202115°F 195440%7%
May 253°F26°F82°F 194713°F 201340%6%
May 354°F26°F85°F 194718°F 201940%6%
May 454°F27°F87°F 196618°F 194441%6%
May 554°F27°F87°F 196617°F 200641%6%
May 655°F27°F85°F 199217°F 202641%5%
May 755°F28°F85°F 198718°F 201242%5%
May 856°F28°F84°F 198719°F 201442%5%
May 956°F28°F82°F 192812°F 200242%5%
May 1056°F28°F82°F 194021°F 193143%4%
May 1157°F29°F86°F 196019°F 201643%4%
May 1257°F29°F88°F 200121°F 193344%4%
May 1357°F29°F87°F 202617°F 194344%4%
May 1458°F30°F87°F 202620°F 198344%3%
May 1558°F30°F87°F 198720°F 192945%3%
May 1658°F30°F88°F 192721°F 197445%3%
May 1759°F31°F87°F 200621°F 194346%3%
May 1859°F31°F87°F 200621°F 196546%3%
May 1959°F31°F92°F 195420°F 200347%2%
May 2060°F31°F88°F 195825°F 193347%2%
May 2160°F32°F85°F 191920°F 191848%2%
May 2260°F32°F86°F 191927°F 191848%2%
May 2361°F32°F84°F 195622°F 193049%2%
May 2461°F32°F86°F 192227°F 194349%2%
May 2561°F33°F87°F 192223°F 195049%2%
May 2661°F33°F89°F 192825°F 192050%2%
May 2762°F33°F89°F 191927°F 193250%1%
May 2862°F33°F94°F 191926°F 193350%1%
May 2962°F33°F92°F 200323°F 194750%1%
May 3062°F34°F90°F 193624°F 197751%1%
May 3162°F34°F90°F 202025°F 198251%1%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Big Sky, in percent, and of at least 0.1 inch of snowfall.02040601102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MDT).

May 1
sunrise 6:14 AM, sunset 8:32 PM
May 31
sunrise 5:41 AM, sunset 9:05 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00240775 (Big Sky 2WNW), public domain. Records: NOAA GHCN-Daily, station USC00242793, 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.