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Germany · 1991–2020

Best time to visit
Alsdorf.

July leads for comfortable weather in Alsdorf: typically 24°C by day, 13.1°C at night, with 94 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortJuly

Typical high24°C

Typical low13.1°C

Rain in July94 mm

Comfort

July

July · August · June

80climate match

Beach

July

July · August · June

43climate match

Outdoors

September

September · May · June

78climate match

The weakest month is January, scoring 5 against July’s 80 — days reach only 4.2°C, 20° 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

54.2° / -1.2°

Feb

55.3° / -1.2°

Mar

129.9° / 1.1°

Apr

4015° / 3.9°

May

5819.2° / 7.9°

Jun

7221.9° / 11°

Jul

8024° / 13.1°

Aug

7923.5° / 12.5°

Sep

5919.1° / 9.2°

Oct

3413.9° / 5.8°

Nov

78.3° / 2.6°

Dec

54.7° / -0.2°

Monthly climate evidence for Alsdorf — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	4.2°C	-1.2°C	122 mm	14.7	8 h 24	5	Strong coverage
February	5.3°C	-1.2°C	95 mm	12.8	9 h 56	5	Strong coverage
March	9.9°C	1.1°C	89 mm	12.7	11 h 42	12	Strong coverage
April	15°C	3.9°C	62 mm	10	13 h 44	40	Strong coverage
May	19.2°C	7.9°C	78 mm	10.9	15 h 29	58	Strong coverage
June	21.9°C	11°C	81 mm	11.4	16 h 28	72	Strong coverage
July	24°C	13.1°C	94 mm	12.6	16 h 05	80	Strong coverage
August	23.5°C	12.5°C	92 mm	11	14 h 32	79	Strong coverage
September	19.1°C	9.2°C	84 mm	10.9	12 h 33	59	Strong coverage
October	13.9°C	5.8°C	93 mm	12.1	10 h 36	34	Strong coverage
November	8.3°C	2.6°C	103 mm	13.6	8 h 52	7	Strong coverage
December	4.7°C	-0.2°C	128 mm	16	7 h 58	5	Strong coverage

What has changed

Alsdorf runs +1.8°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

+2.1

Feb

+0.6

Mar

+2.4

Apr

+2.7

May

+1.9

Jun

+1.3

Jul

+2.0

Aug

+1.9

Sep

+1.4

Oct

+1.1

Nov

+2.1

Dec

—

July daytime highs, 2011–2018. Last recorded: 28.3°C.

Records at SIEGEN (KLARANLAGE), 1937–2018
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	14.0°C18 Jan 2007	-28.3°C27 Jan 1942	50 mm18 Jan 1986	267 mm1986 · driest 9 mm in 1997	76
February	18.3°C24 Feb 1990	-23.4°C16 Feb 1956	81 mm6 Feb 1984	313 mm2002 · driest 7 mm in 1959	76
March	23.9°C30 Mar 1968	-16.5°C5 Mar 1949	49 mm12 Mar 1992	223 mm1988 · driest 12 mm in 1993	77
April	29.7°C21 Apr 1968	-8.0°C12 Apr 1986	42 mm19 Apr 2005	145 mm1950 · driest 1 mm in 2007	77
May	33.0°C28 May 2005	-4.9°C8 May 1941	59 mm28 May 2016	181 mm1984 · driest 18 mm in 1944	77
June	36.0°C18 Jun 2002	-1.1°C3 Jun 1962	96 mm15 Jun 1968	197 mm1968 · driest 22 mm in 1962	77
July	36.4°C5 Jul 2015	2.1°C7 Jul 1964	44 mm11 Jul 1995	216 mm1980 · driest 13 mm in 1971	77
August	37.0°C8 Aug 2003	1.8°C31 Aug 1959	78 mm28 Aug 2002	224 mm2007 · driest 13 mm in 1983	77
September	31.7°C13 Sep 2016	-2.1°C29 Sep 1939	61 mm14 Sep 1998	205 mm1998 · driest 6 mm in 1959	77
October	27.1°C1 Oct 2011	-6.2°C29 Oct 1997	53 mm9 Oct 1997	323 mm1998 · driest 9 mm in 1937	77
November	20.4°C1 Nov 2014	-12.5°C16 Nov 1965	63 mm3 Nov 1940	231 mm1939 · driest 2 mm in 2011	77
December	15.0°C16 Dec 1989	-20.1°C23 Dec 1938	55 mm23 Dec 1967	302 mm1993 · driest 11 mm in 1963	76

Typical days per month at SIEGEN (KLARANLAGE), 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	17	4
February	0	0	16	3
March	0	0	13	3
April	1	0	5	2
May	5	<1	<1	3
June	9	2	0	3
July	13	4	0	3
August	11	3	0	3
September	3	<1	0	3
October	<1	0	2	3
November	0	0	7	4
December	0	0	15	4

The best month has moved. On the 1961–1990 numbers the strongest month here was July (scoring 81); on 2011–2025 it is August (89). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in SIEGEN (KLARANLAGE)’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%	48%	11%	62%	0.2–6.0°C
February	0%	42%	10%	54%	1.9–7.9°C
March	1%	41%	8%	54%	5.7–12.4°C
April	12%	37%	6%	46%	10.9–16.2°C
May	28%	37%	7%	51%	15.1–20.9°C
June	41%	38%	9%	51%	19.0–23.3°C
July	48%	40%	11%	54%	19.9–26.4°C
August	50%	38%	9%	50%	20.1–25.1°C
September	30%	36%	9%	48%	16.4–21.3°C
October	7%	37%	9%	49%	11.6–16.2°C
November	0%	45%	11%	60%	5.7–10.0°C
December	0%	49%	13%	66%	1.1–6.1°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.

1937Each stripe is one year’s mean temperature against the 75-year average. Warmest: 2014. Coolest: 1940.2017

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2958142
NOAA station: GME00128794 · SIEGEN (KLARANLAGE)
Station distance: 11.6 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 27 usable years
Daylight: Calculated from latitude 50.78°, 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 SIEGEN (KLARANLAGE) is what differs

Siegen→Kreuztal→Netphen→Wilnsdorf→Freudenberg→Burbach→

Or put two places side by side: Alsdorf vs Siegen

Best time to visitAlsdorf.

July

July

September

The whole year,without the guesswork.

Alsdorf runs +1.8°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Alsdorf.

The whole year,
without the guesswork.

Alsdorf runs +1.8°C
on the 1961–1990 baseline.

Nearby, measured,
and named.