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Helena, MT weather and climate

Lewis and Clark County, MT · population 33,126 · about 4,009 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Helena's own coordinates.

The year at a glance

Sunny days
201
clear or partly cloudy, per year
Precipitation
21 in
per year
Wet days
133
rain or snow per year
Snowfall
40 in
per year
Hot days
26
above 90 °F
Freezing nights
171
at or below 32 °F
Humidity
65%
average relative
Average temperature
46 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
255075JanMarMayJulSepNovDaily high, Jan: 32 °FDaily high, Feb: 37 °FDaily high, Mar: 47 °FDaily high, Apr: 56 °FDaily high, May: 66 °FDaily high, Jun: 74 °FDaily high, Jul: 86 °FDaily high, Aug: 84 °FDaily high, Sep: 73 °FDaily high, Oct: 57 °FDaily high, Nov: 43 °FDaily high, Dec: 33 °FDaily low, Jan: 13 °FDaily low, Feb: 17 °FDaily low, Mar: 24 °FDaily low, Apr: 32 °FDaily low, May: 41 °FDaily low, Jun: 48 °FDaily low, Jul: 55 °FDaily low, Aug: 53 °FDaily low, Sep: 44 °FDaily low, Oct: 33 °FDaily low, Nov: 23 °FDaily low, Dec: 14 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high323747566674868473574333
Daily low131724324148555344332314

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovHelena, Jan: 0.9 inHelena, Feb: 0.9 inHelena, Mar: 1.4 inHelena, Apr: 2.4 inHelena, May: 3.2 inHelena, Jun: 3.8 inHelena, Jul: 1.7 inHelena, Aug: 1.5 inHelena, Sep: 1.6 inHelena, Oct: 1.5 inHelena, Nov: 1.2 inHelena, Dec: 1.1 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Helena0.90.91.42.43.23.81.71.51.61.51.21.1

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovHelena, Jan: 13 daysHelena, Feb: 12 daysHelena, Mar: 13 daysHelena, Apr: 13 daysHelena, May: 15 daysHelena, Jun: 18 daysHelena, Jul: 26 daysHelena, Aug: 26 daysHelena, Sep: 21 daysHelena, Oct: 18 daysHelena, Nov: 14 daysHelena, Dec: 12 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Helena131213131518262621181412

Compare Helena with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Montana city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).