climigo

Montana

When to go?

The best months are May–June, August–September. Avoid November–March (freezing).

Climate zones

WyomingOregonSouth DakotaIdahoNorth DakotaCanadaBozemanBozemanBozemanHelenaHelenaHelenaBillingsBillingsBillingsMissoulaMissoulaMissoulaButteButteButteBig SkyBig SkyBig SkyGlacier National ParkGlacier National ParkGlacier National Park

Mean maximum and minimum temperature and mean monthly precipitation of the season (the mean of its three months), ERA5-Land 1996–2025, at about 9 km resolution: colours are in levels (the same as the city scale) and smaller details are not real.

What is the climate like?

Area mean indicative, over the whole territory

Temperature and rain

January −1°−12° snow likely
February 1°−11° snow likely
March 7°−7° snow likely
April 12°−2°
May 18°3°
June 24°8°
July 29°12°
August 28°10°
September 23°6°
October 14°−1°
November 6°−6° snow likely
December 0°−11° snow likely

Monthly min and max temperature (°C)

−15°−10°−5°0°5°10°15°20°25°30°35°JanFebMarAprMayJunJulAugSepOctNovDec−11.9 · −0.5 °CJanuary: −11.9 · −0.5 °C−11.3 · 0.9 °CFebruary: −11.3 · 0.9 °C−6.6 · 6.7 °CMarch: −6.6 · 6.7 °C−1.9 · 12.3 °CApril: −1.9 · 12.3 °C3.4 · 18.3 °CMay: 3.4 · 18.3 °C7.8 · 23.7 °CJune: 7.8 · 23.7 °C11.5 · 29.4 °CJuly: 11.5 · 29.4 °C10.2 · 28.4 °CAugust: 10.2 · 28.4 °C5.5 · 22.8 °CSeptember: 5.5 · 22.8 °C−0.6 · 13.9 °COctober: −0.6 · 13.9 °C−6.3 · 5.8 °CNovember: −6.3 · 5.8 °C−11.0 · 0 °CDecember: −11.0 · 0 °C

Monthly min and max temperature (°C)

Jan −11.9 – −0.5 °C
Feb −11.3 – 0.9 °C
Mar −6.6 – 6.7 °C
Apr −1.9 – 12.3 °C
May 3.4 – 18.3 °C
Jun 7.8 – 23.7 °C
Jul 11.5 – 29.4 °C
Aug 10.2 – 28.4 °C
Sep 5.5 – 22.8 °C
Oct −0.6 – 13.9 °C
Nov −6.3 – 5.8 °C
Dec −11.0 – 0 °C

How much it rains

January 21 mm6 d
February 20 mm6 d
March 25 mm6 d
April 37 mm7 d
May 60 mm8 d
June 66 mm8 d
July 32 mm5 d
August 32 mm4 d
September 32 mm4 d
October 31 mm5 d
November 23 mm5 d
December 24 mm6 d

Rain days and how much water

0102030 dJanFebMarAprMayJunJulAugSepOctNovDec21 mm · 6 rain days · 4 mm a dayJanuary: 21 mm · 6 rain days · 4 mm a day20 mm · 6 rain days · 3 mm a dayFebruary: 20 mm · 6 rain days · 3 mm a day25 mm · 6 rain days · 4 mm a dayMarch: 25 mm · 6 rain days · 4 mm a day37 mm · 7 rain days · 5 mm a dayApril: 37 mm · 7 rain days · 5 mm a day60 mm · 8 rain days · 8 mm a dayMay: 60 mm · 8 rain days · 8 mm a day66 mm · 8 rain days · 8 mm a dayJune: 66 mm · 8 rain days · 8 mm a day32 mm · 5 rain days · 6 mm a dayJuly: 32 mm · 5 rain days · 6 mm a day32 mm · 4 rain days · 8 mm a dayAugust: 32 mm · 4 rain days · 8 mm a day32 mm · 4 rain days · 8 mm a daySeptember: 32 mm · 4 rain days · 8 mm a day31 mm · 5 rain days · 6 mm a dayOctober: 31 mm · 5 rain days · 6 mm a day23 mm · 5 rain days · 5 mm a dayNovember: 23 mm · 5 rain days · 5 mm a day24 mm · 6 rain days · 4 mm a dayDecember: 24 mm · 6 rain days · 4 mm a day

Rain days and how much water

Jan 21 mm6 d
Feb 20 mm6 d
Mar 25 mm6 d
Apr 37 mm7 d
May 60 mm8 d
Jun 66 mm8 d
Jul 32 mm5 d
Aug 32 mm4 d
Sep 32 mm4 d
Oct 31 mm5 d
Nov 23 mm5 d
Dec 24 mm6 d

Bars: length = rain days, thickness = mm on a rain day, area = the month's rain. 3 mm a day7 mm a day15 mm a day

Colour = the month's rain: 103060100160250400mm

Daylight hours

January 8 h 57
February 10 h 19
March 11 h 51
April 13 h 35
May 15 h 02
June 15 h 51
July 15 h 31
August 14 h 14
September 12 h 36
October 10 h 56
November 9 h 24
December 8 h 33

Mean daylight hours over the whole territory.

Snow on the ground

January 28 cm
February 32 cm
March 29 cm
April 20 cm
May 8 cm
June 1 cm
July –
August –
September –
October 2 cm
November 6 cm
December 17 cm

Mean snow depth on the ground (cm)

02550 cmJanFebMarAprMayJunJulAugSepOctNovDec28 cmJanuary: 28 cm32 cmFebruary: 32 cm29 cmMarch: 29 cm20 cmApril: 20 cm8 cmMay: 8 cm1 cmJune: 1 cm0 cmJuly: 0 cm0 cmAugust: 0 cm0 cmSeptember: 0 cm2 cmOctober: 2 cm6 cmNovember: 6 cm17 cmDecember: 17 cm

Mean snow depth on the ground (cm)

Jan 28 cm
Feb 32 cm
Mar 29 cm
Apr 20 cm
May 8 cm
Jun 1 cm
Jul 0 cm
Aug 0 cm
Sep 0 cm
Oct 2 cm
Nov 6 cm
Dec 17 cm

Spatial mean over the whole area, weighted by area (cosine of the latitude), not by population: indicative only, since the climate varies a lot within an area (coasts, plains, mountains). Look at the cities for the weather you will find.

Tourist areas

Cities