United States · 1991–2020

Best time to visit
Chelsea.

September leads for comfortable weather in Chelsea: typically 28°C by day, 14.8°C at night, with 93 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high28°C

Typical low14.8°C

Rain in September93 mm

Comfort

September

September · May · October

76climate match

Beach

July

July · August · September

69climate match

Outdoors

April

April · October · November

80climate match

The weakest month is January, scoring 5 against September’s 76 — days reach only 6.8°C, 17° below the 24°C the score treats as ideal, and nights drop to -6.2°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

56.8° / -6.2°

Feb

169.4° / -4.4°

Mar

3915.2° / 0.9°

Apr

6220.3° / 6.4°

May

7124.9° / 12.6°

Jun

5530.1° / 18.1°

Jul

4732.7° / 20.5°

Aug

5032.1° / 19.5°

Sep

7628° / 14.8°

Oct

6921.7° / 7.6°

Nov

4014.3° / 0.8°

Dec

117.9° / -4.3°

Monthly climate evidence for Chelsea — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	6.8°C	-6.2°C	22 mm	3.4	9 h 48	5	Strong coverage
February	9.4°C	-4.4°C	37 mm	4.3	10 h 44	16	Strong coverage
March	15.2°C	0.9°C	62 mm	5.8	11 h 50	39	Strong coverage
April	20.3°C	6.4°C	86 mm	6.6	13 h 07	62	Strong coverage
May	24.9°C	12.6°C	146 mm	9.4	14 h 12	71	Strong coverage
June	30.1°C	18.1°C	139 mm	7.9	14 h 46	55	Strong coverage
July	32.7°C	20.5°C	114 mm	7.1	14 h 33	47	Strong coverage
August	32.1°C	19.5°C	115 mm	6.7	13 h 37	50	Strong coverage
September	28°C	14.8°C	93 mm	5.4	12 h 23	76	Strong coverage
October	21.7°C	7.6°C	85 mm	6.3	11 h 09	69	Strong coverage
November	14.3°C	0.8°C	45 mm	4.3	10 h 04	40	Strong coverage
December	7.9°C	-4.3°C	33 mm	3.8	9 h 33	11	Strong coverage

What has changed

Chelsea 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

+1.2

Feb

-0.4

Mar

+0.7

Apr

-0.7

May

-0.7

Jun

+1.1

Jul

+0.2

Aug

+0.2

Sep

+1.7

Oct

+0.5

Nov

+0.9

Dec

+2.1

September daytime highs, 2011–2025. Last recorded: 28.3°C.

Records at EL DORADO, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	25.6°C24 Jan 1981	-30.6°C4 Jan 1947	42 mm19 Jan 1907	144 mm1949 · driest 0 mm in 1928	127
February	28.9°C22 Feb 1996	-33.3°C13 Feb 1905	56 mm19 Feb 1997	124 mm2001 · driest 0 mm in 1930	127
March	36.1°C22 Mar 2026	-23.3°C7 Mar 1943	92 mm31 Mar 2007	227 mm1973 · driest 0 mm in 1936	125
April	37.2°C7 Apr 1893	-11.1°C3 Apr 1936	105 mm17 Apr 1940	223 mm1944 · driest 2 mm in 1989	126
May	38.3°C29 May 1913	-3.9°C4 May 1907	114 mm21 May 2019	407 mm2019 · driest 14 mm in 1994	126
June	42.2°C16 Jun 1953	6.1°C4 Jun 1951	140 mm8 Jun 1979	310 mm1979 · driest 5 mm in 1911	125
July	47.2°C18 Jul 1936	6.7°C3 Jul 1924	208 mm2 Jul 1905	276 mm1904 · driest 2 mm in 1974	125
August	46.7°C12 Aug 1936	5.6°C24 Aug 1896	230 mm25 Aug 2005	386 mm2005 · driest 1 mm in 1936	124
September	44.4°C3 Sep 1947	-2.2°C30 Sep 1984	146 mm3 Sep 1942	328 mm1965 · driest 3 mm in 1952	124
October	36.7°C6 Oct 1939	-11.1°C30 Oct 1917	146 mm11 Oct 1973	242 mm1998 · driest 0 mm in 1893	124
November	29.4°C9 Nov 2006	-20.0°C13 Nov 1940	206 mm16 Nov 1928	284 mm1928 · driest 0 mm in 1921	126
December	26.7°C24 Dec 1955	-27.8°C22 Dec 1989	72 mm4 Dec 1944	128 mm1984 · driest 0 mm in 1919	123

Typical days per month at EL DORADO, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	27	<1	1
February	<1	0	22	1	1
March	2	<1	14	2	<1
April	8	1	4	3	0
May	17	5	<1	5	0
June	28	17	0	4	0
July	30	25	0	3	0
August	30	23	0	3	0
September	23	12	0	3	0
October	11	2	2	3	<1
November	1	0	14	1	<1
December	0	0	25	1	1

The best month has moved. On the 1961–1990 numbers the strongest month here was May (scoring 80); on 2011–2025 it is October (76). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in EL DORADO’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	2%	11%	2%	8%	2.0–9.7°C
February	9%	14%	4%	10%	4.8–13.5°C
March	27%	18%	7%	16%	11.1–18.9°C
April	49%	22%	9%	22%	18.0–23.7°C
May	64%	28%	12%	33%	22.8–27.5°C
June	74%	26%	13%	28%	28.2–32.6°C
July	79%	21%	9%	19%	31.0–36.3°C
August	80%	20%	9%	20%	30.1–36.1°C
September	77%	20%	9%	18%	25.9–31.5°C
October	60%	18%	7%	16%	19.2–24.8°C
November	20%	13%	5%	9%	10.8–16.9°C
December	3%	11%	3%	7%	4.3–10.7°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.

1893Each stripe is one year’s mean temperature against the 111-year average. Warmest: 1946. Coolest: 2013.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4269439
NOAA station: USC00142401 · EL DORADO
Station distance: 11.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 37.90°, 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 EL DORADO is what differs

El Dorado→Augusta→Towanda→Leon→Potwin→Rosalia→

Or put two places side by side: Chelsea vs El Dorado

Best time to visitChelsea.