United States · 1991–2020

Best time to visit
Clayton.

June leads for comfortable weather in Clayton: typically 25°C by day, 7.2°C at night, with 23 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJune

Typical high25°C

Typical low7.2°C

Rain in June23 mm

Comfort

June

June · September · August

81climate match

Beach

August

August · July · June

65climate match

Outdoors

May

May · September · June

85climate match

The weakest month is January, scoring 5 against June’s 81 — days reach only -1.4°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

5-1.4° / -12.6°

Feb

52.4° / -9.5°

Mar

179.4° / -4.4°

Apr

3814.1° / -1.1°

May

6219.5° / 3.6°

Jun

8125° / 7.2°

Jul

6831.4° / 10.6°

Aug

7129.7° / 9.2°

Sep

8123.7° / 4.7°

Oct

4215° / -0.9°

Nov

55.7° / -6.7°

Dec

5-1.6° / -12.6°

Monthly climate evidence for Clayton — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-1.4°C	-12.6°C	10 mm	2.9	9 h 12	5	Good coverage
February	2.4°C	-9.5°C	9 mm	2.9	10 h 23	5	Good coverage
March	9.4°C	-4.4°C	12 mm	3.5	11 h 47	17	Good coverage
April	14.1°C	-1.1°C	13 mm	3.4	13 h 23	38	Good coverage
May	19.5°C	3.6°C	25 mm	5.5	14 h 45	62	Good coverage
June	25°C	7.2°C	23 mm	5	15 h 30	81	Good coverage
July	31.4°C	10.6°C	9 mm	2.7	15 h 12	68	Good coverage
August	29.7°C	9.2°C	12 mm	2.9	14 h 01	71	Good coverage
September	23.7°C	4.7°C	17 mm	2.9	12 h 27	81	Good coverage
October	15°C	-0.9°C	15 mm	3	10 h 54	42	Good coverage
November	5.7°C	-6.7°C	12 mm	3.5	9 h 33	5	Good coverage
December	-1.6°C	-12.6°C	13 mm	3.7	8 h 52	5	Good coverage

Records at CHALLIS AP, 1998–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	13.3°C31 Jan 2003	-35.5°C15 Jan 2017	14 mm11 Jan 2000	38 mm2017 · driest 3 mm in 2015	28
February	16.1°C6 Feb 2015	-27.7°C12 Feb 2025	9 mm6 Feb 2024	30 mm2019 · driest 0 mm in 2001	28
March	23.9°C20 Mar 2026	-18.9°C2 Mar 2002	18 mm17 Mar 2012	39 mm2012 · driest 2 mm in 2022	28
April	28.3°C22 Apr 2012	-11.6°C2 Apr 2008	17 mm20 Apr 2001	32 mm2006 · driest 1 mm in 2021	27
May	35.6°C28 May 2003	-6.7°C8 May 2002	25 mm3 May 2022	61 mm2010 · driest 1 mm in 2026	28
June	37.8°C28 Jun 2015	-1.6°C7 Jun 2012	35 mm27 Jun 2026	61 mm2020 · driest 2 mm in 2000	28
July	39.4°C12 Jul 2002	2.2°C5 Jul 1999	17 mm12 Jul 2011	27 mm2011 · driest 0 mm in 2018	28
August	38.9°C10 Aug 2018	0.6°C31 Aug 2006	26 mm20 Aug 2023	56 mm2023 · driest 2 mm in 2000	27
September	37.2°C3 Sep 2022	-7.2°C28 Sep 1999	28 mm9 Sep 2010	59 mm2001 · driest 0 mm in 1999	27
October	28.9°C4 Oct 2024	-20.0°C31 Oct 2002	27 mm28 Oct 2004	50 mm2006 · driest 1 mm in 2024	28
November	22.2°C7 Nov 2006	-24.3°C16 Nov 2014	21 mm21 Nov 2006	32 mm2006 · driest 1 mm in 2019	28
December	17.2°C2 Dec 2021	-30.5°C18 Dec 2016	12 mm2 Dec 2012	34 mm2016 · driest 1 mm in 2002	28

Typical days per month at CHALLIS AP, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	31	<1
February	0	0	28	0
March	0	0	28	<1
April	<1	0	19	<1
May	7	1	6	<1
June	17	7	<1	<1
July	29	22	0	<1
August	28	17	0	<1
September	15	4	3	<1
October	2	0	19	<1
November	0	0	28	<1
December	0	0	31	0

How often, not how much — every day in CHALLIS AP’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%	10%	<1%	4%	-4.2–2.6°C
February	0%	10%	0%	7%	0.2–5.2°C
March	4%	11%	<1%	4%	6.8–12.7°C
April	17%	12%	<1%	6%	12.2–16.1°C
May	46%	17%	<1%	17%	17.3–22.2°C
June	74%	15%	1%	14%	22.2–27.7°C
July	91%	9%	<1%	5%	29.3–33.2°C
August	89%	10%	<1%	5%	27.6–31.4°C
September	75%	10%	1%	7%	21.9–26.8°C
October	24%	10%	<1%	4%	13.3–18.3°C
November	<1%	11%	<1%	6%	2.8–9.0°C
December	0%	13%	<1%	8%	-3.8–2.3°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.

1999Each stripe is one year’s mean temperature against the 26-year average. Warmest: 2025. Coolest: 2002.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5588965
NOAA station: USW00004114 · CHALLIS AP
Station distance: 32.8 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 44.26°, 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 CHALLIS AP is what differs

Challis→Crystal (historical)→Garden City (historical)→

Or put two places side by side: Clayton vs Challis

Best time to visitClayton.

June

August

May

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Clayton.

The whole year,
without the guesswork.

Nearby, measured,
and named.