United States · 1991–2020

Best time to visit
Fourmile Lake.

September leads for comfortable weather in Fourmile Lake: typically 23.9°C by day, 11.1°C at night, with 71 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high23.9°C

Typical low11.1°C

Rain in September71 mm

Comfort

September

September · June · August

84climate match

Beach

July

July · August · June

71climate match

Outdoors

September

September · May · October

74climate match

The weakest month is January, scoring 5 against September’s 84 — days reach only -0.8°C, 25° 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

5-0.8° / -9°

Feb

50.6° / -8.8°

Mar

57.3° / -3.5°

Apr

3414.6° / 2.5°

May

6121° / 8.6°

Jun

7626.3° / 13.8°

Jul

7228.5° / 16°

Aug

7627.2° / 15°

Sep

8423.9° / 11.1°

Oct

4316.2° / 4.6°

Nov

118.8° / -0.6°

Dec

52.3° / -5.1°

Monthly climate evidence for Fourmile Lake — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-0.8°C	-9°C	62 mm	10	9 h 24	5	Good coverage
February	0.6°C	-8.8°C	48 mm	7.9	10 h 29	5	Good coverage
March	7.3°C	-3.5°C	64 mm	8	11 h 48	5	Good coverage
April	14.6°C	2.5°C	81 mm	9.5	13 h 18	34	Good coverage
May	21°C	8.6°C	107 mm	11	14 h 34	61	Good coverage
June	26.3°C	13.8°C	101 mm	8.9	15 h 15	76	Good coverage
July	28.5°C	16°C	83 mm	8	14 h 59	72	Good coverage
August	27.2°C	15°C	94 mm	8.7	13 h 53	76	Good coverage
September	23.9°C	11.1°C	71 mm	7.5	12 h 26	84	Good coverage
October	16.2°C	4.6°C	82 mm	9.6	10 h 59	43	Good coverage
November	8.8°C	-0.6°C	74 mm	9.2	9 h 43	11	Good coverage
December	2.3°C	-5.1°C	56 mm	10.3	9 h 06	5	Good coverage

Records at CHELSEA, 2002–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.7°C8 Jan 2008	-29.4°C24 Jan 2026	45 mm11 Jan 2020	122 mm2008 · driest 18 mm in 2022	24
February	22.2°C28 Feb 2024	-31.7°C20 Feb 2015	42 mm20 Feb 2018	110 mm2018 · driest 4 mm in 2024	24
March	30.6°C23 Mar 2012	-23.3°C6 Mar 2015	42 mm28 Mar 2020	109 mm2017 · driest 13 mm in 2005	25
April	30.0°C16 Apr 2002	-9.4°C5 Apr 2016	44 mm23 Apr 2022	161 mm2011 · driest 7 mm in 2004	25
May	35.0°C29 May 2018	-3.9°C4 May 2005	72 mm10 May 2006	226 mm2011 · driest 27 mm in 2023	25
June	37.2°C29 Jun 2012	3.3°C1 Jun 2003	66 mm20 Jun 2009	174 mm2009 · driest 26 mm in 2017	24
July	38.3°C7 Jul 2012	6.7°C1 Jul 2007	156 mm28 Jul 2011	217 mm2011 · driest 6 mm in 2018	25
August	35.6°C4 Aug 2012	5.0°C30 Aug 2025	70 mm9 Aug 2011	167 mm2007 · driest 14 mm in 2025	24
September	34.4°C24 Sep 2017	-0.6°C19 Sep 2020	64 mm14 Sep 2008	170 mm2008 · driest 19 mm in 2024	24
October	31.1°C5 Oct 2025	-5.6°C30 Oct 2008	62 mm5 Oct 2013	166 mm2021 · driest 13 mm in 2005	24
November	25.6°C10 Nov 2020	-17.8°C13 Nov 2019	41 mm30 Nov 2006	140 mm2011 · driest 14 mm in 2022	24
December	16.7°C13 Dec 2015	-26.7°C28 Dec 2017	27 mm22 Dec 2013	104 mm2008 · driest 18 mm in 2010	24

Typical days per month at CHELSEA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	28	2	8
February	0	0	26	1	7
March	<1	<1	23	2	3
April	2	<1	10	3	<1
May	8	2	1	4	0
June	19	6	0	3	0
July	26	11	0	3	0
August	25	6	0	3	0
September	14	3	<1	2	0
October	3	<1	6	2	0
November	<1	0	18	2	2
December	0	0	27	1	5

How often, not how much — every day in CHELSEA’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%	30%	4%	34%	-3.7–2.6°C
February	<1%	27%	5%	26%	-2.8–4.8°C
March	5%	26%	7%	30%	4.6–11.0°C
April	17%	32%	9%	40%	12.1–17.2°C
May	40%	32%	10%	36%	19.4–23.5°C
June	66%	31%	11%	31%	24.9–27.5°C
July	71%	28%	10%	30%	26.7–30.2°C
August	71%	28%	10%	24%	26.0–28.2°C
September	65%	26%	9%	29%	22.3–25.7°C
October	22%	31%	8%	35%	14.4–19.1°C
November	4%	30%	8%	34%	5.4–12.0°C
December	0%	32%	5%	36%	0.1–5.7°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.

2003Each stripe is one year’s mean temperature against the 22-year average. Warmest: 2024. Coolest: 2014.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 4993242
NOAA station: USC00201502 · CHELSEA
Station distance: 3.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 18 usable years
Daylight: Calculated from latitude 42.33°, 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 CHELSEA is what differs

Chelsea→Dexter→Grass Lake→Francisco→Guthrie→Jerusalem→

Or put two places side by side: Fourmile Lake vs Chelsea

Best time to visitFourmile Lake.

September

July

September

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Fourmile Lake.

The whole year,
without the guesswork.

Nearby, measured,
and named.