United States · 1991–2020

Best time to visit
King.

September leads for comfortable weather in King: typically 27.7°C by day, 13.5°C at night, with 92 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high27.7°C

Typical low13.5°C

Rain in September92 mm

Comfort

September

September · May · October

75climate match

Beach

June

June · July · August

73climate match

Outdoors

October

October · April · September

73climate match

The weakest month is January, scoring 5 against September’s 75 — days reach only 8°C, 16° below the 24°C the score treats as ideal, and nights drop to -4.9°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

58° / -4.9°

Feb

1310.7° / -2.8°

Mar

3315.8° / 1.8°

Apr

5921.4° / 6.6°

May

7125.5° / 12.2°

Jun

6629.8° / 17°

Jul

5432.1° / 19.1°

Aug

5831.7° / 18.2°

Sep

7527.7° / 13.5°

Oct

6722° / 6.8°

Nov

3215.4° / 1.5°

Dec

99.7° / -2.8°

Monthly climate evidence for King — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	8°C	-4.9°C	86 mm	6.1	9 h 56	5	Strong coverage
February	10.7°C	-2.8°C	91 mm	6.5	10 h 48	13	Strong coverage
March	15.8°C	1.8°C	117 mm	8.5	11 h 51	33	Strong coverage
April	21.4°C	6.6°C	132 mm	7.6	13 h 04	59	Strong coverage
May	25.5°C	12.2°C	134 mm	8.9	14 h 05	71	Strong coverage
June	29.8°C	17°C	86 mm	6.9	14 h 38	66	Strong coverage
July	32.1°C	19.1°C	94 mm	7	14 h 25	54	Strong coverage
August	31.7°C	18.2°C	89 mm	6.8	13 h 33	58	Strong coverage
September	27.7°C	13.5°C	92 mm	5.6	12 h 22	75	Strong coverage
October	22°C	6.8°C	96 mm	7.1	11 h 12	67	Strong coverage
November	15.4°C	1.5°C	117 mm	7	10 h 11	32	Strong coverage
December	9.7°C	-2.8°C	94 mm	6.8	9 h 41	9	Strong coverage

What has changed

King 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

0.0

Feb

-0.4

Mar

-0.4

Apr

-1.5

May

-1.4

Jun

-0.4

Jul

-1.1

Aug

-1.4

Sep

-0.2

Oct

-1.1

Nov

-0.3

Dec

+1.1

September daytime highs, 2011–2025. Last recorded: 30.7°C.

Records at MAMMOTH SPRING, 1904–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	26.1°C25 Jan 1950	-30.6°C13 Jan 1918	191 mm30 Jan 2010	321 mm1950 · driest 1 mm in 1943	117
February	31.7°C28 Feb 2024	-31.1°C2 Feb 1951	108 mm14 Feb 1949	251 mm1945 · driest 10 mm in 1947	118
March	36.1°C24 Mar 1929	-17.2°C7 Mar 1967	183 mm19 Mar 2008	388 mm2008 · driest 10 mm in 1918	117
April	35.0°C19 Apr 1920	-7.2°C4 Apr 1987	130 mm5 Apr 1997	362 mm2011 · driest 5 mm in 2001	119
May	37.2°C31 May 1913	-2.2°C2 May 1909	125 mm12 May 1918	318 mm2011 · driest 14 mm in 1911	116
June	42.2°C29 Jun 2012	1.7°C3 Jun 1969	89 mm13 Jun 1925	340 mm1928 · driest 0 mm in 1930	118
July	43.3°C13 Jul 1980	7.2°C6 Jul 1972	130 mm8 Jul 1928	299 mm2023 · driest 0 mm in 1930	120
August	42.8°C9 Aug 1934	4.4°C29 Aug 1986	152 mm16 Aug 1926	369 mm1915 · driest 3 mm in 2007	119
September	42.8°C3 Sep 1954	-1.1°C29 Sep 1967	112 mm23 Sep 2006	303 mm1993 · driest 0 mm in 2004	119
October	35.6°C11 Oct 1963	-9.4°C21 Oct 1952	110 mm30 Oct 2009	377 mm2009 · driest 0 mm in 1904	118
November	30.6°C1 Nov 1950	-16.7°C29 Nov 1958	127 mm18 Nov 2003	319 mm1994 · driest 0 mm in 1904	118
December	26.7°C3 Dec 1956	-29.4°C9 Dec 1917	314 mm3 Dec 1982	543 mm1982 · driest 0 mm in 1989	121

Typical days per month at MAMMOTH SPRING, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	25	3	<1
February	<1	0	20	3	<1
March	3	<1	13	4	<1
April	9	<1	4	4	0
May	19	5	<1	5	0
June	27	17	0	3	0
July	30	24	0	3	0
August	29	22	0	3	0
September	23	10	0	3	0
October	11	2	3	3	0
November	1	0	14	3	<1
December	0	0	21	3	<1

The best month has moved. On the 1961–1990 numbers the strongest month here was October (scoring 77); on 2011–2025 it is September (80). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in MAMMOTH SPRING’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	5%	21%	9%	19%	5.5–12.2°C
February	10%	23%	10%	23%	7.7–14.3°C
March	28%	25%	12%	25%	12.7–20.6°C
April	52%	28%	13%	30%	19.9–24.6°C
May	66%	28%	14%	31%	24.0–28.3°C
June	75%	25%	12%	25%	28.4–32.3°C
July	78%	22%	10%	21%	30.6–34.9°C
August	79%	21%	9%	19%	29.6–34.8°C
September	78%	20%	10%	18%	26.1–31.2°C
October	62%	20%	10%	19%	20.6–25.3°C
November	26%	21%	11%	19%	12.9–18.5°C
December	5%	21%	10%	20%	7.7–13.6°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.

1907Each stripe is one year’s mean temperature against the 105-year average. Warmest: 1921. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4117467
NOAA station: USC00034572 · MAMMOTH SPRING
Station distance: 10.1 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 36.40°, 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 MAMMOTH SPRING is what differs

Thayer→Mammoth Spring→Koshkonong→Frickenger (historical)→Fryatt→Many Islands→

Or put two places side by side: King vs Thayer

Best time to visitKing.

September

June

October

The whole year,without the guesswork.

King runs -0.6°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
King.

The whole year,
without the guesswork.

King runs -0.6°C
on the 1961–1990 baseline.

Nearby, measured,
and named.