United States · 1991–2020

Best time to visit
Altona.

August leads for comfortable weather in Altona: typically 24.8°C by day, 14.1°C at night, with 102 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high24.8°C

Typical low14.1°C

Rain in August102 mm

Comfort

August

August · July · June

79climate match

Beach

July

July · August · June

52climate match

Outdoors

September

September · May · June

78climate match

The weakest month is January, scoring 5 against August’s 79 — days reach only -2.9°C, 27° 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

5-2.9° / -12.9°

Feb

5-1.4° / -11.7°

Mar

53.7° / -6.6°

Apr

1611.3° / 0.5°

May

5118.9° / 7.4°

Jun

7323.3° / 12.5°

Jul

7725.6° / 15°

Aug

7924.8° / 14.1°

Sep

6520.8° / 10°

Oct

2613.6° / 3.9°

Nov

56.1° / -2.4°

Dec

50° / -8.7°

Monthly climate evidence for Altona — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	-2.9°C	-12.9°C	76 mm	10.1	9 h 08	5	Strong coverage
February	-1.4°C	-11.7°C	64 mm	8.4	10 h 20	5	Strong coverage
March	3.7°C	-6.6°C	68 mm	9.8	11 h 46	5	Strong coverage
April	11.3°C	0.5°C	101 mm	10.8	13 h 25	16	Strong coverage
May	18.9°C	7.4°C	109 mm	12.2	14 h 48	51	Strong coverage
June	23.3°C	12.5°C	123 mm	11.8	15 h 35	73	Strong coverage
July	25.6°C	15°C	108 mm	11	15 h 16	77	Strong coverage
August	24.8°C	14.1°C	102 mm	10.8	14 h 04	79	Strong coverage
September	20.8°C	10°C	97 mm	10.1	12 h 28	65	Strong coverage
October	13.6°C	3.9°C	118 mm	12.3	10 h 53	26	Strong coverage
November	6.1°C	-2.4°C	79 mm	10.3	9 h 29	5	Strong coverage
December	0°C	-8.7°C	81 mm	11	8 h 48	5	Strong coverage

What has changed

Altona runs +0.8°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

+0.8

Feb

+1.3

Mar

+0.9

Apr

+0.4

May

+0.9

Jun

-0.4

Jul

+0.3

Aug

+0.6

Sep

+1.2

Oct

+1.1

Nov

+0.8

Dec

+2.1

August daytime highs, 2011–2025. Last recorded: 25.7°C.

Records at DANNEMORA, 1906–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	17.8°C15 Jan 1995	-36.7°C4 Jan 1981	71 mm9 Jan 1998	161 mm1998 · driest 3 mm in 1981	120
February	19.4°C21 Feb 2018	-39.4°C4 Feb 2023	59 mm17 Feb 1954	178 mm1920 · driest 7 mm in 1980	119
March	26.1°C21 Mar 2012	-30.0°C7 Mar 1989	100 mm6 Mar 1920	278 mm1920 · driest 4 mm in 1967	120
April	31.1°C18 Apr 2002	-18.3°C1 Apr 1923	58 mm9 Apr 2000	182 mm2011 · driest 9 mm in 1906	119
May	34.4°C21 May 1911	-7.8°C9 May 1983	69 mm26 May 2013	209 mm2013 · driest 15 mm in 1921	119
June	36.1°C11 Jun 1947	-1.1°C4 Jun 1910	78 mm25 Jun 2013	318 mm2013 · driest 13 mm in 1945	117
July	36.7°C20 Jul 1978	4.4°C21 Jul 1914	86 mm11 Jul 1970	307 mm2023 · driest 24 mm in 1960	117
August	36.7°C11 Aug 1944	0.6°C28 Aug 1982	84 mm28 Aug 2011	256 mm2011 · driest 10 mm in 1957	118
September	35.0°C4 Sep 1961	-3.9°C29 Sep 1980	116 mm17 Sep 1999	224 mm1977 · driest 13 mm in 1941	117
October	31.1°C2 Oct 1950	-10.6°C19 Oct 1922	79 mm22 Oct 1995	241 mm2005 · driest 12 mm in 1994	118
November	23.9°C1 Nov 2024	-22.2°C22 Nov 2018	93 mm9 Nov 1996	266 mm1988 · driest 11 mm in 1915	117
December	18.3°C6 Dec 2001	-37.8°C29 Dec 1933	61 mm13 Dec 1983	190 mm2003 · driest 8 mm in 1955	119

Typical days per month at DANNEMORA, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)	Snow days
January	0	0	30	3	3
February	0	0	27	2	1
March	<1	0	26	2	<1
April	<1	<1	14	4	0
May	5	<1	2	4	0
June	11	2	0	4	0
July	18	3	0	4	0
August	16	2	0	4	0
September	6	<1	<1	3	0
October	<1	0	8	4	0
November	0	0	21	3	<1
December	0	0	29	3	1

The best month has moved. On the 1961–1990 numbers the strongest month here was June (scoring 86); on 2011–2025 it is August (86). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in DANNEMORA’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%	33%	6%	40%	-6.3–0.5°C
February	0%	31%	6%	37%	-5.6–1.2°C
March	<1%	31%	7%	37%	0.0–7.3°C
April	8%	33%	9%	41%	7.8–14.1°C
May	31%	35%	10%	46%	15.3–21.8°C
June	54%	36%	12%	46%	21.5–25.4°C
July	65%	34%	11%	44%	23.9–28.0°C
August	62%	33%	10%	40%	22.9–26.5°C
September	41%	32%	10%	41%	18.5–22.6°C
October	14%	34%	9%	45%	11.5–16.2°C
November	1%	35%	8%	45%	3.1–8.9°C
December	0%	35%	8%	44%	-4.3–2.5°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.

1906Each stripe is one year’s mean temperature against the 105-year average. Warmest: 2023. Coolest: 1926.2023

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 5107082
NOAA station: USC00301966 · DANNEMORA
Station distance: 19.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 26 usable years
Daylight: Calculated from latitude 44.89°, 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 DANNEMORA is what differs

Dannemora→Redford→Lyon Mountain→Alder Bend→Beartown→Cadyville→

Or put two places side by side: Altona vs Dannemora

Best time to visitAltona.