United States · 1991–2020

Best time to visit
Altamont.

August leads for comfortable weather in Altamont: typically 26.6°C by day, 8.4°C at night, with 27 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high26.6°C

Typical low8.4°C

Rain in August27 mm

Comfort

August

August · June · July

78climate match

Beach

July

July · August · June

61climate match

Outdoors

September

September · June · August

83climate match

The weakest month is January, scoring 5 against August’s 78 — days reach only 0.6°C, 23° below the 24°C the score treats as ideal, and nights drop to -11.6°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

50.6° / -11.6°

Feb

51.6° / -10.3°

Mar

67.1° / -6.1°

Apr

2612° / -2.7°

May

5117.6° / 1.4°

Jun

7723° / 5°

Jul

7727.5° / 8.7°

Aug

7826.6° / 8.4°

Sep

7121.7° / 3.7°

Oct

3814.5° / -1.4°

Nov

56.2° / -7.3°

Dec

50.7° / -11.7°

Monthly climate evidence for Altamont — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	0.6°C	-11.6°C	20 mm	3.7	9 h 30	5	Strong coverage
February	1.6°C	-10.3°C	18 mm	3.2	10 h 33	5	Strong coverage
March	7.1°C	-6.1°C	16 mm	3.5	11 h 48	6	Strong coverage
April	12°C	-2.7°C	33 mm	5.7	13 h 15	26	Strong coverage
May	17.6°C	1.4°C	42 mm	5.8	14 h 28	51	Strong coverage
June	23°C	5°C	31 mm	4.3	15 h 08	77	Strong coverage
July	27.5°C	8.7°C	22 mm	3.3	14 h 52	77	Strong coverage
August	26.6°C	8.4°C	27 mm	4.2	13 h 49	78	Strong coverage
September	21.7°C	3.7°C	30 mm	4	12 h 25	71	Strong coverage
October	14.5°C	-1.4°C	27 mm	3.9	11 h 02	38	Strong coverage
November	6.2°C	-7.3°C	25 mm	4	9 h 49	5	Strong coverage
December	0.7°C	-11.7°C	20 mm	4.1	9 h 13	5	Strong coverage

What has changed

Altamont runs +1.0°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

-0.1

Mar

+1.6

Apr

+0.5

May

+0.8

Jun

+1.6

Jul

+0.6

Aug

+0.4

Sep

+1.5

Oct

+0.6

Nov

+1.5

Dec

+1.4

August daytime highs, 2012–2025. Last recorded: 28.7°C.

Records at EVANSTON 1 E, 1893–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	13.9°C23 Jan 1981	-37.2°C25 Jan 1949	33 mm12 Jan 2005	105 mm1914 · driest 0 mm in 2018	128
February	21.1°C25 Feb 1986	-38.9°C12 Feb 1905	51 mm19 Feb 2007	97 mm1936 · driest 0 mm in 1985	127
March	23.9°C21 Mar 2026	-34.4°C2 Mar 1917	51 mm23 Mar 1899	130 mm1899 · driest 0 mm in 1893	128
April	27.8°C13 Apr 1985	-21.7°C1 Apr 1920	38 mm2 Apr 1986	99 mm2019 · driest 0 mm in 1893	129
May	31.1°C18 May 1948	-12.8°C6 May 1965	67 mm30 May 1924	115 mm1957 · driest 0 mm in 1893	124
June	34.4°C24 Jun 1988	-7.2°C21 Jun 1960	40 mm9 Jun 1941	102 mm1947 · driest 0 mm in 2013	124
July	37.2°C7 Jul 1985	-4.4°C3 Jul 1921	48 mm10 Jul 2006	70 mm1965 · driest 0 mm in 2005	126
August	34.4°C5 Aug 1979	-5.0°C31 Aug 1962	39 mm3 Aug 1926	97 mm2014 · driest 0 mm in 1944	124
September	33.9°C7 Sep 2022	-15.0°C25 Sep 1926	53 mm28 Sep 2014	119 mm2014 · driest 0 mm in 1988	125
October	27.8°C5 Oct 2024	-22.2°C31 Oct 1972	36 mm30 Oct 1992	75 mm1914 · driest 0 mm in 2000	124
November	20.6°C15 Nov 1999	-30.0°C16 Nov 1955	32 mm15 Nov 1958	78 mm2001 · driest 0 mm in 1917	123
December	17.8°C5 Dec 1939	-36.7°C9 Dec 1951	46 mm22 Dec 2015	72 mm1964 · driest 0 mm in 2004	123

Typical days per month at EVANSTON 1 E, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	29	<1	4
February	0	0	27	<1	4
March	0	0	27	<1	2
April	<1	0	23	<1	1
May	2	0	11	1	<1
June	12	<1	3	1	0
July	24	7	<1	<1	0
August	23	3	<1	<1	0
September	7	<1	5	1	<1
October	<1	0	20	<1	<1
November	0	0	27	<1	4
December	0	0	28	<1	4

How often, not how much — every day in EVANSTON 1 E’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%	15%	1%	14%	-2.7–2.3°C
February	0%	18%	2%	14%	-1.9–4.4°C
March	<1%	18%	2%	17%	1.7–8.9°C
April	7%	20%	2%	18%	8.2–14.9°C
May	34%	20%	3%	18%	14.2–19.3°C
June	70%	15%	3%	13%	19.8–25.5°C
July	88%	12%	2%	8%	25.6–29.4°C
August	84%	15%	2%	12%	24.9–28.4°C
September	67%	14%	3%	12%	19.3–24.1°C
October	21%	15%	3%	13%	11.2–17.8°C
November	<1%	15%	2%	11%	2.8–9.7°C
December	0%	15%	1%	11%	-2.6–4.4°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.

1899Each stripe is one year’s mean temperature against the 104-year average. Warmest: 2025. Coolest: 1951.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5817091
NOAA station: USC00483100 · EVANSTON 1 E
Station distance: 15.2 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 41.19°, 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 EVANSTON 1 E is what differs

Evanston→Aspen→Beartown→Hilliard→

Or put two places side by side: Altamont vs Evanston

Best time to visitAltamont.