United States · 1991–2020

Best time to visit
Big Sky.

July leads for comfortable weather in Big Sky: typically 26°C by day, 4.7°C at night, with 32 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high26°C

Typical low4.7°C

Rain in July32 mm

Comfort

July

July · August · September

71climate match

Beach

July

July · August · September

40climate match

Outdoors

September

September · June · July

76climate match

The weakest month is January, scoring 5 against July’s 71 — days reach only -0.8°C, 25° below the 24°C the score treats as ideal, and nights drop to -13.2°C.

Month by month

The whole year,
without the guesswork.

The bars show the comfort score. Day and night temperatures come from daily observed highs and lows; rain is the historical monthly estimate.

Jan

5-0.8° / -13.2°

Feb

51.6° / -13.2°

Mar

56.3° / -9.2°

Apr

99.8° / -5.7°

May

2915.4° / -1.6°

Jun

4919.9° / 2°

Jul

7126° / 4.7°

Aug

7025.5° / 3.9°

Sep

5920.7° / 0.4°

Oct

2212.4° / -4.2°

Nov

53.3° / -9.7°

Dec

5-1.9° / -13.6°

Monthly climate evidence for Big Sky — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.8°C	-13.2°C	46 mm	9.6	9 h 05	5	Good coverage
February	1.6°C	-13.2°C	38 mm	9.1	10 h 19	5	Good coverage
March	6.3°C	-9.2°C	38 mm	8.4	11 h 46	5	Good coverage
April	9.8°C	-5.7°C	49 mm	8.9	13 h 26	9	Good coverage
May	15.4°C	-1.6°C	72 mm	11.4	14 h 51	29	Good coverage
June	19.9°C	2°C	76 mm	11.7	15 h 38	49	Good coverage
July	26°C	4.7°C	32 mm	7.9	15 h 19	71	Good coverage
August	25.5°C	3.9°C	38 mm	7.8	14 h 06	70	Good coverage
September	20.7°C	0.4°C	38 mm	6.9	12 h 28	59	Good coverage
October	12.4°C	-4.2°C	43 mm	7.2	10 h 52	22	Good coverage
November	3.3°C	-9.7°C	46 mm	8.2	9 h 27	5	Good coverage
December	-1.9°C	-13.6°C	50 mm	9.7	8 h 45	5	Good coverage

Records at BIG SKY 2WNW, 1984–2021
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	12.2°C31 Jan 2003	-39.4°C29 Jan 1991	17 mm25 Jan 2004	75 mm1997 · driest 14 mm in 2005	29
February	13.9°C27 Feb 1988	-41.1°C3 Feb 1989	16 mm6 Feb 2020	69 mm1999 · driest 6 mm in 1990	28
March	18.3°C26 Mar 2015	-28.9°C29 Mar 1987	26 mm29 Mar 2009	92 mm2014 · driest 3 mm in 1993	29
April	25.0°C30 Apr 1985	-22.8°C6 Apr 1997	19 mm29 Apr 2010	83 mm2010 · driest 6 mm in 1985	29
May	28.9°C28 May 2003	-13.3°C9 May 2002	45 mm9 May 1991	139 mm1991 · driest 5 mm in 1993	29
June	32.8°C24 Jun 1988	-7.2°C5 Jun 1998	50 mm13 Jun 2001	177 mm1992 · driest 3 mm in 1996	32
July	35.0°C12 Jul 2002	-3.9°C7 Jul 1988	32 mm10 Jul 1987	103 mm1987 · driest 6 mm in 1996	31
August	33.9°C7 Aug 1990	-6.7°C26 Aug 1992	30 mm8 Aug 2008	103 mm1984 · driest 2 mm in 2001	30
September	31.7°C4 Sep 1998	-11.1°C24 Sep 2000	39 mm21 Sep 1984	89 mm1997 · driest 0 mm in 1993	29
October	27.2°C1 Oct 1992	-22.8°C31 Oct 2002	38 mm11 Oct 2001	86 mm2007 · driest 0 mm in 1987	29
November	17.8°C1 Nov 2014	-30.0°C2 Nov 1991	39 mm11 Nov 1992	131 mm1991 · driest 4 mm in 2019	30
December	11.7°C12 Dec 2014	-40.0°C22 Dec 1990	39 mm4 Dec 1996	109 mm1996 · driest 5 mm in 1986	30

Typical days per month at BIG SKY 2WNW, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	11
February	0	0	27	<1	10
March	0	0	29	<1	9
April	0	0	26	1	7
May	<1	0	19	2	3
June	5	<1	9	2	<1
July	19	3	1	<1	0
August	19	3	2	<1	0
September	7	<1	14	1	<1
October	<1	0	25	1	4
November	0	0	27	<1	8
December	0	0	29	1	12

How often, not how much — every day in BIG SKY 2WNW’s record sorted by what it was actually like, rather than averaged
Month	Warm & dry days	Wet days	Washouts	Week with 3+ wet days	Daytime mean has ranged
January	0%	30%	3%	31%	-2.5–1.3°C
February	0%	30%	1%	37%	-1.8–4.3°C
March	0%	27%	2%	32%	3.9–9.1°C
April	5%	28%	3%	32%	7.8–12.9°C
May	23%	36%	7%	46%	13.1–18.6°C
June	45%	37%	7%	48%	17.6–22.7°C
July	70%	27%	2%	31%	23.7–28.0°C
August	71%	25%	3%	29%	23.2–27.7°C
September	55%	23%	4%	26%	18.6–23.5°C
October	15%	21%	4%	23%	9.8–16.2°C
November	0%	29%	3%	33%	0.7–6.2°C
December	0%	30%	3%	37%	-4.6–0.5°C

A warm and dry day reaches 20°C with under 1 mm of rain; a wet day gets 1 mm or more; a washout gets 10 mm or more. The week column is the share of seven-day stretches in that month, across the station’s whole daily record, that contained three or more wet days — the odds a week-long trip is rained on repeatedly, counted rather than modelled. The last column is the 10th to 90th percentile of that month’s daytime average across individual years: a narrow band means the average is what you will get, a wide one means the average is a midpoint between years that felt quite different.

1986Each stripe is one year’s mean temperature against the 21-year average. Warmest: 1988. Coolest: 2008.2014

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5640193
NOAA station: USC00240775 · BIG SKY 2WNW
Station distance: 3.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 20 usable years
Daylight: Calculated from latitude 45.28°, mid-month, sunrise to sunset including refraction. Not a station measurement.
Important limit: Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.

These places read the same station, so their numbers are identical — distance from BIG SKY 2WNW is what differs

Big Sky Canyon Village→Big Sky Meadow Village→Big Sky Mobile Home Court→George Norman Trailer Court→

Or put two places side by side: Big Sky vs Big Sky Canyon Village

Best time to visitBig Sky.

July

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Big Sky.

The whole year,
without the guesswork.

Nearby, measured,
and named.