United States · 1991–2020

Best time to visit
Minnesela.

September leads for comfortable weather in Minnesela: typically 26.5°C by day, 7.6°C at night, with 28 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high26.5°C

Typical low7.6°C

Rain in September28 mm

Comfort

September

September · June · May

78climate match

Beach

August

August · July · June

68climate match

Outdoors

May

May · October · September

80climate match

The weakest month is January, scoring 5 against September’s 78 — days reach only 2.9°C, 21° below the 24°C the score treats as ideal, and nights drop to -11.4°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

52.9° / -11.4°

Feb

55.4° / -9.1°

Mar

2712.2° / -3.6°

Apr

4716.6° / 0.8°

May

7121.9° / 5.8°

Jun

7628.3° / 10.4°

Jul

6733.2° / 14°

Aug

6932.1° / 12.8°

Sep

7826.5° / 7.6°

Oct

5418° / 1°

Nov

149.2° / -5.7°

Dec

53° / -10.9°

Monthly climate evidence for Minnesela — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	2.9°C	-11.4°C	9 mm	2.1	9 h 16	5	Strong coverage
February	5.4°C	-9.1°C	10 mm	2.6	10 h 25	5	Strong coverage
March	12.2°C	-3.6°C	21 mm	3.3	11 h 47	27	Strong coverage
April	16.6°C	0.8°C	40 mm	5.3	13 h 21	47	Strong coverage
May	21.9°C	5.8°C	53 mm	6.3	14 h 41	71	Strong coverage
June	28.3°C	10.4°C	33 mm	5.2	15 h 25	76	Strong coverage
July	33.2°C	14°C	19 mm	3.6	15 h 07	67	Strong coverage
August	32.1°C	12.8°C	12 mm	2.9	13 h 58	69	Strong coverage
September	26.5°C	7.6°C	28 mm	3.8	12 h 27	78	Strong coverage
October	18°C	1°C	28 mm	3.7	10 h 56	54	Strong coverage
November	9.2°C	-5.7°C	16 mm	3.1	9 h 36	14	Strong coverage
December	3°C	-10.9°C	9 mm	2.3	8 h 57	5	Strong coverage

Records at THERMOPOLIS, 1899–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	19.4°C9 Jan 1953	-42.2°C16 Jan 1930	36 mm16 Jan 1995	51 mm1995 · driest 0 mm in 1992	90
February	21.1°C22 Feb 1958	-41.1°C9 Feb 1933	23 mm28 Feb 2004	48 mm2004 · driest 0 mm in 1963	88
March	28.9°C20 Mar 2026	-33.3°C16 Mar 1906	57 mm20 Mar 1904	106 mm1904 · driest 0 mm in 1997	90
April	31.7°C29 Apr 1939	-21.1°C5 Apr 1936	88 mm6 Apr 1922	210 mm1904 · driest 2 mm in 1954	86
May	36.7°C31 May 1936	-11.1°C2 May 1954	56 mm22 May 2008	147 mm1904 · driest 0 mm in 1936	88
June	40.6°C23 Jun 1954	-4.4°C3 Jun 1951	58 mm2 Jun 1915	144 mm1963 · driest 0 mm in 1933	89
July	42.8°C12 Jul 2026	1.1°C8 Jul 1955	31 mm26 Jul 2007	148 mm1903 · driest 0 mm in 1932	89
August	41.1°C23 Aug 1903	-5.0°C25 Aug 1910	48 mm12 Aug 1930	106 mm1930 · driest 0 mm in 1910	87
September	40.0°C7 Sep 2022	-13.9°C25 Sep 1926	126 mm30 Sep 1923	180 mm1923 · driest 0 mm in 2015	88
October	33.3°C3 Oct 1917	-23.9°C26 Oct 2020	55 mm30 Oct 1922	100 mm1912 · driest 0 mm in 1933	87
November	25.0°C15 Nov 1941	-33.3°C16 Nov 1955	28 mm11 Nov 1923	54 mm1928 · driest 0 mm in 1939	86
December	25.6°C10 Dec 1939	-38.9°C19 Dec 1924	28 mm19 Dec 1925	46 mm1925 · driest 0 mm in 2018	87

Typical days per month at THERMOPOLIS, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	3
February	0	0	27	<1	3
March	<1	0	25	<1	2
April	3	<1	13	1	<1
May	10	2	2	2	<1
June	23	13	0	1	0
July	30	26	0	<1	0
August	29	24	0	<1	0
September	20	10	<1	<1	<1
October	5	<1	13	1	<1
November	0	0	27	<1	2
December	0	0	30	<1	2

How often, not how much — every day in THERMOPOLIS’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%	8%	<1%	1%	-2.4–6.3°C
February	<1%	10%	<1%	2%	-0.2–9.9°C
March	9%	13%	2%	4%	6.7–14.7°C
April	32%	19%	6%	13%	13.5–19.8°C
May	59%	22%	7%	19%	18.6–25.0°C
June	78%	19%	4%	14%	25.4–30.8°C
July	86%	14%	2%	6%	30.8–35.5°C
August	89%	11%	1%	4%	30.2–33.7°C
September	78%	14%	3%	8%	22.8–28.9°C
October	44%	13%	3%	6%	14.4–21.3°C
November	5%	10%	1%	3%	5.6–13.1°C
December	<1%	9%	<1%	1%	-1.0–6.8°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.

1908Each stripe is one year’s mean temperature against the 70-year average. Warmest: 2012. Coolest: 1916.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5832517
NOAA station: USC00488875 · THERMOPOLIS
Station distance: 7 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 43.59°, 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 THERMOPOLIS is what differs

Thermopolis→East Thermopolis→Red Lane→

Or put two places side by side: Minnesela vs Thermopolis

Best time to visitMinnesela.

September

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Minnesela.

The whole year,
without the guesswork.

Nearby, measured,
and named.