Dillon climate

Dillon Weather in December

NOAA 1991-2020 normals for Dillon U Of Montana Western, 0.8 km from Dillon

Average highs run from 34°F on December 1 to 32°F on December 31, and lows from 16°F to 13°F. Normal precipitation for the month is 0.45 in over about 5 wet days.

December day by day

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

Normal daily high and low temperature at Dillon, in °F, with the record for each date.-40-20020406080151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

December at a glance

Average high
32°F
Average low
13°F
Precipitation
0.45 in
Snowfall
4.6 in
Record high
62°FDec 2, 2021
Record low
-37°FDec 24, 1983
Chance of a freeze
100%
Daylight
9 h 01 min to 8 h 48 min
Cloud cover
65%
Humidity
91%
Dew point
11°F
Wind
8.3 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
Dec 134°F16°F60°F 2021-16°F 198516%4%
Dec 234°F16°F62°F 2021-7°F 198516%4%
Dec 334°F15°F55°F 1940-7°F 197216%5%
Dec 433°F15°F56°F 2021-25°F 197216%5%
Dec 533°F15°F54°F 1987-27°F 197216%5%
Dec 633°F15°F57°F 2023-24°F 197216%5%
Dec 732°F14°F50°F 1975-24°F 197216%5%
Dec 832°F14°F55°F 2020-27°F 197216%5%
Dec 932°F14°F58°F 1957-33°F 197216%5%
Dec 1032°F14°F58°F 2025-23°F 197216%5%
Dec 1132°F13°F58°F 2025-21°F 196116%5%
Dec 1231°F13°F56°F 2025-12°F 196116%5%
Dec 1331°F13°F58°F 2025-15°F 196316%5%
Dec 1431°F13°F61°F 2025-16°F 200816%5%
Dec 1531°F13°F57°F 1980-27°F 200816%6%
Dec 1631°F13°F55°F 1962-26°F 196416%6%
Dec 1731°F12°F57°F 1980-27°F 196416%6%
Dec 1831°F12°F58°F 1979-16°F 198316%6%
Dec 1931°F12°F52°F 1979-22°F 199016%6%
Dec 2031°F12°F53°F 1942-25°F 199016%6%
Dec 2131°F12°F53°F 1969-33°F 198316%6%
Dec 2231°F12°F53°F 1955-35°F 198316%6%
Dec 2331°F12°F50°F 1964-35°F 198316%6%
Dec 2431°F12°F53°F 2025-37°F 198316%6%
Dec 2531°F12°F53°F 2025-19°F 198316%6%
Dec 2631°F12°F52°F 1989-13°F 194115%6%
Dec 2731°F12°F57°F 1980-16°F 194115%5%
Dec 2831°F13°F52°F 1945-24°F 197815%5%
Dec 2931°F13°F52°F 1980-33°F 199015%5%
Dec 3031°F13°F55°F 1980-30°F 197815%5%
Dec 3132°F13°F50°F 1980-25°F 197815%5%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Dillon, in percent, and of at least 0.1 inch of snowfall.051015201102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (MST).

December 1
sunrise 7:49 AM, sunset 4:50 PM
December 31
sunrise 8:10 AM, sunset 4:58 PM

Every day of December: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00242409 (Dillon U Of Montana Western), public domain. Records: NOAA GHCN-Daily, station USW00024138, 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.