United States · 1991–2020

Best time to visit
Sioux Crossing.

September leads for comfortable weather in Sioux Crossing: typically 23.6°C by day, 6.2°C at night, with 34 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.6°C

Typical low6.2°C

Rain in September34 mm

Comfort

September

September · June · August

81climate match

Beach

August

August · July · September

68climate match

Outdoors

September

September · May · June

80climate match

The weakest month is January, scoring 5 against September’s 81 — days reach only 3.7°C, 20° below the 24°C the score treats as ideal.

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

53.7° / -7.2°

Feb

54.8° / -7°

Mar

199.9° / -3.5°

Apr

3414.1° / 0°

May

5519.5° / 4.5°

Jun

7724.5° / 8.8°

Jul

7130.4° / 11.9°

Aug

7329.6° / 10.7°

Sep

8123.6° / 6.2°

Oct

4315.3° / 1.2°

Nov

138° / -3.4°

Dec

53.2° / -7.1°

Monthly climate evidence for Sioux Crossing — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.7°C	-7.2°C	16 mm	3	9 h 02	5	Strong coverage
February	4.8°C	-7°C	15 mm	3.2	10 h 17	5	Strong coverage
March	9.9°C	-3.5°C	25 mm	4.3	11 h 45	19	Strong coverage
April	14.1°C	0°C	55 mm	7.3	13 h 28	34	Strong coverage
May	19.5°C	4.5°C	73 mm	9.1	14 h 54	55	Strong coverage
June	24.5°C	8.8°C	71 mm	8.6	15 h 42	77	Strong coverage
July	30.4°C	11.9°C	35 mm	5.9	15 h 23	71	Strong coverage
August	29.6°C	10.7°C	26 mm	4.2	14 h 08	73	Strong coverage
September	23.6°C	6.2°C	34 mm	4.8	12 h 29	81	Strong coverage
October	15.3°C	1.2°C	40 mm	5.7	10 h 50	43	Strong coverage
November	8°C	-3.4°C	20 mm	3.6	9 h 24	13	Strong coverage
December	3.2°C	-7.1°C	18 mm	2.8	8 h 41	5	Strong coverage

What has changed

Sioux Crossing runs -0.3°C
on the 1961–1990 baseline.

Each bar compares the 2011–2025 daytime average for that month against the same month in 1961–1990, measured at the same station. Months where the older record is too thin to compare are left blank.

Jan

+1.3

Feb

-3.1

Mar

+0.5

Apr

-1.2

May

-1.2

Jun

-0.3

Jul

+0.2

Aug

-0.3

Sep

+1.4

Oct

-1.2

Nov

+0.3

Dec

+0.5

September daytime highs, 2011–2025. Last recorded: 26.3°C.

Records at BIG TIMBER, 1894–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C8 Jan 1922	-37.8°C31 Jan 1917	53 mm11 Jan 1998	63 mm1928 · driest 0 mm in 1981	121
February	22.2°C26 Feb 1950	-43.9°C15 Feb 1936	31 mm28 Feb 1953	68 mm2025 · driest 0 mm in 1977	124
March	26.7°C20 Mar 2026	-35.6°C4 Mar 2019	58 mm22 Mar 2011	95 mm1935 · driest 0 mm in 1926	123
April	31.7°C19 Apr 1962	-23.3°C5 Apr 1936	102 mm16 Apr 2002	312 mm1900 · driest 0 mm in 1934	121
May	36.1°C28 May 1919	-12.2°C2 May 1954	102 mm19 May 1938	205 mm2011 · driest 1 mm in 1936	120
June	41.1°C22 Jun 1919	-3.3°C14 Jun 1968	81 mm25 Jun 1969	194 mm1944 · driest 0 mm in 1933	119
July	43.3°C21 Jul 1931	0.6°C2 Jul 1915	79 mm6 Jul 1994	100 mm1987 · driest 0 mm in 1933	120
August	41.7°C14 Aug 1929	-2.2°C25 Aug 1910	53 mm27 Aug 1933	108 mm1933 · driest 0 mm in 1955	117
September	37.8°C4 Sep 1950	-11.1°C24 Sep 1926	47 mm24 Sep 2025	124 mm1918 · driest 0 mm in 1922	118
October	31.1°C4 Oct 1933	-25.6°C25 Oct 1919	60 mm17 Oct 1938	130 mm1938 · driest 0 mm in 1948	118
November	25.6°C2 Nov 1965	-33.9°C13 Nov 1959	64 mm3 Nov 1922	83 mm1922 · driest 0 mm in 1949	119
December	26.7°C30 Dec 1897	-38.9°C24 Dec 1983	46 mm31 Dec 1996	57 mm1996 · driest 0 mm in 1959	121

Typical days per month at BIG TIMBER, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	24	<1	2
February	0	0	23	<1	3
March	<1	0	22	<1	2
April	1	0	15	2	1
May	6	<1	4	3	<1
June	15	5	0	2	0
July	27	18	0	<1	0
August	26	16	<1	<1	0
September	14	4	2	1	<1
October	2	<1	12	1	1
November	0	0	20	<1	2
December	0	0	24	<1	2

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 79); on 2011–2025 it is September (85). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in BIG TIMBER’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	<1%	10%	1%	7%	-1.1–7.3°C
February	<1%	11%	<1%	8%	0.5–9.2°C
March	4%	14%	2%	9%	4.5–12.6°C
April	23%	20%	4%	17%	12.1–18.2°C
May	48%	26%	8%	31%	17.4–23.1°C
June	66%	27%	7%	27%	22.3–28.2°C
July	83%	17%	3%	12%	27.9–33.1°C
August	85%	14%	3%	10%	27.1–32.2°C
September	68%	16%	4%	13%	20.2–26.5°C
October	36%	15%	4%	11%	12.8–20.2°C
November	3%	12%	2%	7%	5.0–11.9°C
December	<1%	10%	1%	5%	-0.5–7.6°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.

1896Each stripe is one year’s mean temperature against the 107-year average. Warmest: 1934. Coolest: 2019.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5678032
NOAA station: USC00240780 · BIG TIMBER
Station distance: 23.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 45.87°, 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 TIMBER is what differs

Big Timber→Greycliff→Carney→Duffy Trailer Court→Quebec→Sourdough→

Or put two places side by side: Sioux Crossing vs Big Timber

Best time to visitSioux Crossing.

September

August

September

The whole year,without the guesswork.

Sioux Crossing runs -0.3°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Sioux Crossing.

The whole year,
without the guesswork.

Sioux Crossing runs -0.3°C
on the 1961–1990 baseline.

Nearby, measured,
and named.