Germany · 1991–2020

Best time to visit
Altenau.

July leads for comfortable weather in Altenau: typically 20°C by day, 11.7°C at night, with 123 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high20°C

Typical low11.7°C

Rain in July123 mm

Comfort

July

July · August · June

59climate match

Beach

July

July · August · June

21climate match

Outdoors

June

June · July · August

71climate match

The weakest month is January, scoring 5 against July’s 59 — days reach only 1.1°C, 23° 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

51.1° / -3.5°

Feb

51.8° / -3.3°

Mar

55.5° / -0.7°

Apr

2210.9° / 2.8°

May

3815.1° / 6.6°

Jun

5317.8° / 9.3°

Jul

5920° / 11.7°

Aug

5619.7° / 11.5°

Sep

4115.5° / 8.2°

Oct

1510.3° / 4.3°

Nov

54.9° / 0.7°

Dec

51.4° / -2.9°

Monthly climate evidence for Altenau — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	1.1°C	-3.5°C	144 mm	14.7	8 h 16	5	Good coverage
February	1.8°C	-3.3°C	105 mm	13.4	9 h 51	5	Good coverage
March	5.5°C	-0.7°C	114 mm	13.6	11 h 41	5	Good coverage
April	10.9°C	2.8°C	76 mm	10.6	13 h 47	22	Good coverage
May	15.1°C	6.6°C	101 mm	12	15 h 37	38	Good coverage
June	17.8°C	9.3°C	101 mm	11.5	16 h 40	53	Good coverage
July	20°C	11.7°C	123 mm	13.5	16 h 14	59	Good coverage
August	19.7°C	11.5°C	136 mm	13.2	14 h 38	56	Good coverage
September	15.5°C	8.2°C	117 mm	11.3	12 h 34	41	Good coverage
October	10.3°C	4.3°C	115 mm	12.8	10 h 33	15	Good coverage
November	4.9°C	0.7°C	125 mm	14.8	8 h 44	5	Good coverage
December	1.4°C	-2.9°C	129 mm	16.2	7 h 48	5	Good coverage

Records at CLAUSTHAL-ZELLERFELD, 1890–2012
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	12.6°C31 Jan 1971	-25.8°C27 Jan 1942	63 mm19 Jan 2008	323 mm1976 · driest 5 mm in 1996	116
February	19.1°C26 Feb 1900	-25.2°C1 Feb 1956	63 mm3 Feb 1946	341 mm1946 · driest 12 mm in 1982	116
March	19.8°C24 Mar 1977	-20.8°C4 Mar 1987	55 mm17 Mar 1957	269 mm2000 · driest 0 mm in 1914	116
April	26.3°C22 Apr 1968	-13.8°C13 Apr 1986	71 mm12 Apr 1994	194 mm1980 · driest 5 mm in 1893	115
May	29.7°C28 May 1892	-5.6°C7 May 1909	83 mm7 May 2007	291 mm2007 · driest 7 mm in 1990	115
June	30.0°C27 Jun 1947	-1.1°C1 Jun 1977	86 mm6 Jun 1986	302 mm1966 · driest 20 mm in 1915	115
July	32.8°C20 Jul 2006	1.5°C7 Jul 1964	83 mm5 Jul 1955	382 mm1954 · driest 11 mm in 1971	115
August	33.7°C9 Aug 1992	1.6°C22 Aug 1973	93 mm21 Aug 2007	300 mm2010 · driest 21 mm in 1944	115
September	30.3°C16 Sep 1947	-2.2°C29 Sep 1936	84 mm21 Sep 1906	395 mm2001 · driest 2 mm in 1959	115
October	25.7°C1 Oct 2011	-8.0°C24 Oct 2003	71 mm15 Oct 1905	347 mm1905 · driest 3 mm in 1908	115
November	18.3°C1 Nov 1892	-18.1°C27 Nov 1890	75 mm7 Nov 1991	294 mm1947 · driest 9 mm in 2011	115
December	13.5°C1 Dec 1984	-21.7°C31 Dec 1978	66 mm19 Dec 1991	382 mm1974 · driest 13 mm in 1890	115

Typical days per month at CLAUSTHAL-ZELLERFELD, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	24	5
February	0	0	21	4
March	0	0	18	4
April	0	0	8	2
May	<1	0	<1	3
June	3	0	0	3
July	6	<1	0	4
August	4	<1	0	4
September	<1	0	<1	4
October	0	0	5	4
November	0	0	13	4
December	0	0	23	4

How often, not how much — every day in CLAUSTHAL-ZELLERFELD’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%	50%	15%	66%	-2.8–3.1°C
February	0%	47%	12%	63%	-2.0–4.2°C
March	0%	43%	10%	58%	1.4–7.5°C
April	2%	43%	9%	55%	5.7–12.0°C
May	10%	40%	10%	54%	11.3–16.6°C
June	20%	43%	11%	58%	14.8–19.3°C
July	26%	45%	15%	61%	15.8–21.1°C
August	25%	43%	13%	58%	15.6–20.8°C
September	12%	40%	11%	55%	12.4–17.4°C
October	1%	41%	12%	54%	7.2–12.9°C
November	0%	48%	13%	65%	1.8–6.6°C
December	0%	50%	15%	68%	-1.7–3.4°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.

1890Each stripe is one year’s mean temperature against the 115-year average. Warmest: 2007. Coolest: 1940.2011

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2957880
NOAA station: GME00132562 · CLAUSTHAL-ZELLERFELD
Station distance: 6.5 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 21 usable years
Daylight: Calculated from latitude 51.80°, 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 CLAUSTHAL-ZELLERFELD is what differs

Clausthal-Zellerfeld→Bad Grund→Wildemann→Ober Schulenberg→Silberhütte→Riefensbeek→

Or put two places side by side: Altenau vs Clausthal-Zellerfeld

Best time to visitAltenau.

July

July

June

The whole year,without the guesswork.

Nearby, measured,and named.

Best time to visit
Altenau.

The whole year,
without the guesswork.

Nearby, measured,
and named.