United States · 1991–2020

Best time to visit
Guernsey.

September leads for comfortable weather in Guernsey: typically 25.8°C by day, 5.1°C at night, with 32 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortSeptember

Typical high25.8°C

Typical low5.1°C

Rain in September32 mm

Comfort

September

September · June · August

75climate match

Beach

August

August · July · June

64climate match

Outdoors

May

May · September · October

74climate match

The weakest month is January, scoring 5 against September’s 75 — days reach only 5.3°C, 19° below the 24°C the score treats as ideal, and nights drop to -11°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

55.3° / -11°

Feb

56.3° / -10.4°

Mar

2312.1° / -5.8°

Apr

3915.9° / -2°

May

5920.9° / 3.7°

Jun

7127.5° / 8.6°

Jul

6532.1° / 12.3°

Aug

6831.1° / 11°

Sep

7525.8° / 5.1°

Oct

4817.7° / -1.8°

Nov

1410.2° / -7.4°

Dec

55.1° / -10.9°

Monthly climate evidence for Guernsey — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.3°C	-11°C	6 mm	2	9 h 24	5	Strong coverage
February	6.3°C	-10.4°C	13 mm	2.9	10 h 30	5	Strong coverage
March	12.1°C	-5.8°C	19 mm	3.5	11 h 48	23	Strong coverage
April	15.9°C	-2°C	44 mm	5.7	13 h 18	39	Strong coverage
May	20.9°C	3.7°C	73 mm	8.1	14 h 34	59	Strong coverage
June	27.5°C	8.6°C	55 mm	6.6	15 h 15	71	Strong coverage
July	32.1°C	12.3°C	44 mm	5.7	14 h 59	65	Strong coverage
August	31.1°C	11°C	36 mm	4.4	13 h 53	68	Strong coverage
September	25.8°C	5.1°C	32 mm	4.6	12 h 26	75	Strong coverage
October	17.7°C	-1.8°C	29 mm	4	10 h 59	48	Strong coverage
November	10.2°C	-7.4°C	12 mm	3	9 h 43	14	Strong coverage
December	5.1°C	-10.9°C	11 mm	2.9	9 h 06	5	Strong coverage

Records at OLD FT LARAMIE, 1989–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	22.2°C28 Jan 2015	-36.7°C16 Jan 2024	12 mm18 Jan 2023	41 mm2023 · driest 0 mm in 2010	37
February	22.2°C22 Feb 1995	-37.8°C18 Feb 2006	21 mm18 Feb 1999	46 mm2017 · driest 1 mm in 1996	36
March	32.2°C25 Mar 2026	-27.8°C3 Mar 2019	44 mm18 Mar 2003	77 mm2021 · driest 0 mm in 2012	36
April	31.7°C25 Apr 2012	-17.8°C3 Apr 2020	56 mm19 Apr 2000	97 mm2016 · driest 2 mm in 1992	37
May	36.7°C30 May 2003	-7.8°C8 May 2010	70 mm19 May 2018	173 mm2018 · driest 13 mm in 1993	37
June	40.6°C28 Jun 1990	-2.2°C6 Jun 1998	54 mm25 Jun 2005	147 mm2005 · driest 6 mm in 2022	37
July	41.1°C3 Jul 1990	2.8°C31 Jul 2004	51 mm15 Jul 1994	128 mm1994 · driest 7 mm in 2006	34
August	40.0°C5 Aug 2022	-1.7°C20 Aug 2004	57 mm20 Aug 1993	104 mm1993 · driest 0 mm in 2012	34
September	38.9°C5 Sep 1998	-6.7°C22 Sep 1995	37 mm5 Sep 2004	103 mm2004 · driest 0 mm in 2010	34
October	33.3°C2 Oct 1992	-26.7°C27 Oct 2020	38 mm11 Oct 2013	88 mm2013 · driest 0 mm in 2014	35
November	26.7°C9 Nov 1999	-26.7°C13 Nov 2014	26 mm1 Nov 2000	34 mm1990 · driest 3 mm in 2012	34
December	22.8°C2 Dec 2021	-40.0°C22 Dec 1989	14 mm28 Dec 2019	38 mm2007 · driest 0 mm in 2001	36

Typical days per month at OLD FT LARAMIE, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	0	2
February	0	0	27	<1	3
March	<1	0	28	<1	2
April	3	<1	20	1	2
May	9	2	7	2	<1
June	22	11	<1	2	0
July	29	23	0	1	0
August	28	21	<1	1	0
September	19	9	4	1	<1
October	6	<1	21	1	1
November	<1	0	27	<1	2
December	0	0	29	<1	3

How often, not how much — every day in OLD FT LARAMIE’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%	7%	<1%	3%	2.3–8.2°C
February	1%	11%	<1%	5%	2.0–10.6°C
March	15%	11%	2%	7%	8.9–15.3°C
April	32%	18%	4%	14%	13.3–18.6°C
May	51%	26%	8%	29%	17.4–23.3°C
June	75%	22%	6%	19%	24.8–30.8°C
July	81%	18%	4%	16%	30.1–34.2°C
August	85%	14%	4%	11%	28.9–33.3°C
September	75%	15%	3%	12%	23.8–28.2°C
October	43%	13%	3%	10%	15.2–20.5°C
November	11%	10%	<1%	4%	7.6–14.4°C
December	<1%	8%	<1%	5%	2.3–8.6°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.

1990Each stripe is one year’s mean temperature against the 32-year average. Warmest: 2024. Coolest: 1993.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5826723
NOAA station: USC00486852 · OLD FT LARAMIE
Station distance: 16.9 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 29 usable years
Daylight: Calculated from latitude 42.27°, 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 OLD FT LARAMIE is what differs

Fort Laramie→Hartville→Sunrise→

Or put two places side by side: Guernsey vs Fort Laramie

Best time to visitGuernsey.

September

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Guernsey.

The whole year,
without the guesswork.

Nearby, measured,
and named.