United States · 1991–2020

Best time to visit
Superior.

September leads for comfortable weather in Superior: typically 27.2°C by day, 12.1°C at night, with 56 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.2°C

Typical low12.1°C

Rain in September56 mm

Comfort

September

September · May · June

79climate match

Beach

August

August · June · July

71climate match

Outdoors

October

October · April · September

85climate match

The weakest month is January, scoring 5 against September’s 79 — days reach only 3.4°C, 21° below the 24°C the score treats as ideal, and nights drop to -9.2°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

53.4° / -9.2°

Feb

56.3° / -7.1°

Mar

2912.8° / -2.1°

Apr

5518.8° / 3.6°

May

7424.4° / 10.2°

Jun

6530° / 16.1°

Jul

5332.2° / 18.6°

Aug

6331° / 17.3°

Sep

7927.2° / 12.1°

Oct

6419.9° / 4.8°

Nov

2811.9° / -2.5°

Dec

55° / -7.6°

Monthly climate evidence for Superior — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	3.4°C	-9.2°C	17 mm	3.5	9 h 37	5	Strong coverage
February	6.3°C	-7.1°C	19 mm	3.3	10 h 37	5	Strong coverage
March	12.8°C	-2.1°C	38 mm	5.4	11 h 49	29	Strong coverage
April	18.8°C	3.6°C	61 mm	6.9	13 h 12	55	Strong coverage
May	24.4°C	10.2°C	111 mm	8.9	14 h 22	74	Strong coverage
June	30°C	16.1°C	101 mm	7.7	15 h	65	Strong coverage
July	32.2°C	18.6°C	105 mm	7.5	14 h 45	53	Strong coverage
August	31°C	17.3°C	84 mm	6.6	13 h 45	63	Strong coverage
September	27.2°C	12.1°C	56 mm	5.2	12 h 24	79	Strong coverage
October	19.9°C	4.8°C	51 mm	5.2	11 h 04	64	Strong coverage
November	11.9°C	-2.5°C	33 mm	3.7	9 h 55	28	Strong coverage
December	5°C	-7.6°C	24 mm	3.3	9 h 20	5	Strong coverage

What has changed

Superior runs +0.6°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

+0.7

Feb

-0.2

Mar

+1.0

Apr

-0.4

May

+0.2

Jun

+0.6

Jul

-0.8

Aug

-0.6

Sep

+2.0

Oct

+1.0

Nov

+2.0

Dec

+1.9

September daytime highs, 2011–2025. Last recorded: 27.7°C.

Records at SUPERIOR, 1902–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C10 Jan 1990	-31.7°C14 Jan 1905	31 mm5 Jan 1932	54 mm1932 · driest 0 mm in 1921	79
February	28.3°C29 Feb 1972	-36.1°C16 Feb 2021	29 mm27 Feb 1948	59 mm2001 · driest 0 mm in 1904	77
March	38.3°C21 Mar 1907	-23.3°C4 Mar 1978	79 mm17 Mar 1987	254 mm1987 · driest 0 mm in 1921	76
April	37.2°C22 Apr 1989	-15.0°C14 Apr 1905	80 mm14 Apr 1987	179 mm1921 · driest 4 mm in 1902	73
May	38.9°C30 May 1934	-6.7°C1 May 1909	181 mm7 May 2015	333 mm1903 · driest 21 mm in 2023	71
June	42.2°C26 Jun 1936	3.3°C1 Jun 2012	112 mm24 Jun 1997	262 mm1908 · driest 20 mm in 1976	78
July	44.4°C12 Jul 1939	6.7°C30 Jul 1971	98 mm1 Jul 2022	336 mm2020 · driest 2 mm in 1936	77
August	43.3°C18 Aug 1934	5.0°C27 Aug 1906	90 mm3 Aug 1985	199 mm1977 · driest 13 mm in 1971	77
September	41.1°C2 Sep 2000	-3.9°C29 Sep 1984	132 mm3 Sep 1973	336 mm1973 · driest 14 mm in 2024	75
October	36.1°C6 Oct 2024	-11.1°C31 Oct 1993	74 mm1 Oct 1907	145 mm2002 · driest 0 mm in 1933	75
November	30.0°C9 Nov 2006	-21.7°C28 Nov 1976	126 mm16 Nov 1996	190 mm1996 · driest 0 mm in 1904	73
December	26.1°C3 Dec 2021	-34.4°C23 Dec 1989	36 mm14 Dec 2015	82 mm1984 · driest 0 mm in 1908	79

Typical days per month at SUPERIOR, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	<1	4
February	<1	0	25	<1	4
March	2	0	21	1	2
April	6	2	8	2	<1
May	16	6	<1	4	0
June	26	16	0	3	0
July	29	23	0	3	0
August	29	19	0	3	0
September	21	10	<1	2	0
October	7	2	7	1	<1
November	<1	0	21	<1	2
December	0	0	30	<1	3

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 81); on 2011–2025 it is September (79). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in SUPERIOR’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%	3%	-1.1–6.8°C
February	5%	11%	2%	7%	0.4–11.0°C
March	20%	16%	4%	12%	8.0–16.4°C
April	39%	21%	7%	19%	15.7–21.3°C
May	59%	28%	11%	32%	21.9–26.4°C
June	73%	27%	11%	29%	27.2–31.8°C
July	76%	22%	9%	21%	30.5–35.0°C
August	78%	22%	9%	19%	28.9–33.4°C
September	76%	18%	7%	15%	24.4–29.8°C
October	50%	13%	4%	9%	16.8–22.3°C
November	13%	10%	3%	6%	8.9–14.9°C
December	<1%	9%	2%	4%	1.0–8.2°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.

1903Each stripe is one year’s mean temperature against the 57-year average. Warmest: 1998. Coolest: 1903.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5079887
NOAA station: USC00258320 · SUPERIOR
Station distance: 1.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 28 usable years
Daylight: Calculated from latitude 40.02°, 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 SUPERIOR is what differs

Nelson→Hardy→Ruskin→Oak→Nora→Warwick→

Or put two places side by side: Superior vs Nelson

Best time to visitSuperior.