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Germany · 1991–2020

Best time to visit
Troisdorf.

August leads for comfortable weather in Troisdorf: typically 24.5°C by day, 12.8°C at night, with 83 mm of rain. Based on measured 1991–2020 NOAA station history.

Best comfortAugust

Typical high24.5°C

Typical low12.8°C

Rain in August83 mm

Comfort

August

August · July · June

80climate match

Beach

July

July · August · June

48climate match

Outdoors

September

September · May · June

84climate match

The weakest month is January, scoring 5 against August’s 80 — days reach only 5.9°C, 18° 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

55.9° / 0°

Feb

87.2° / 0.1°

Mar

2611.4° / 2°

Apr

4816.1° / 4.5°

May

6419.7° / 8.1°

Jun

7522.7° / 11.2°

Jul

7924.9° / 13.3°

Aug

8024.5° / 12.8°

Sep

6820.4° / 9.7°

Oct

4515.2° / 6.8°

Nov

219.8° / 3.5°

Dec

56.5° / 1°

Monthly climate evidence for Troisdorf — daylight is calculated from latitude, everything else is measured
Month	Day	Night	Rain	Wet days	Daylight	Comfort	Coverage
January	5.9°C	0°C	62 mm	12.2	8 h 24	5	Strong coverage
February	7.2°C	0.1°C	54 mm	11.1	9 h 56	8	Strong coverage
March	11.4°C	2°C	55 mm	10.5	11 h 42	26	Strong coverage
April	16.1°C	4.5°C	48 mm	8.7	13 h 44	48	Strong coverage
May	19.7°C	8.1°C	62 mm	9.6	15 h 29	64	Strong coverage
June	22.7°C	11.2°C	86 mm	10.6	16 h 29	75	Strong coverage
July	24.9°C	13.3°C	87 mm	11.4	16 h 05	79	Strong coverage
August	24.5°C	12.8°C	83 mm	11	14 h 32	80	Strong coverage
September	20.4°C	9.7°C	67 mm	10.2	12 h 33	68	Strong coverage
October	15.2°C	6.8°C	65 mm	11	10 h 36	45	Strong coverage
November	9.8°C	3.5°C	64 mm	11.4	8 h 51	21	Strong coverage
December	6.5°C	1°C	69 mm	13	7 h 58	5	Strong coverage

What has changed

Troisdorf runs +2.0°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

+1.7

Feb

+1.9

Mar

+2.5

Apr

+2.5

May

+1.7

Jun

+2.5

Jul

+2.0

Aug

+2.2

Sep

+1.6

Oct

+1.0

Nov

+1.5

Dec

+2.3

August daytime highs, 2011–2025. Last recorded: 25.4°C.

Records at KOLN-BONN, 1931–2026
Month	Record high	Record low	Wettest day	Wettest / driest month	Years
January	16.2°C5 Jan 1999	-25.0°C27 Jan 1942	34 mm18 Jan 1986	119 mm1995 · driest 6 mm in 1997	79
February	21.0°C27 Feb 2019	-20.0°C3 Feb 1942	35 mm6 Feb 1984	122 mm2002 · driest 4 mm in 1986	79
March	26.8°C31 Mar 2021	-13.4°C6 Mar 1971	25 mm9 Mar 1981	160 mm1988 · driest 7 mm in 2025	79
April	30.8°C21 Apr 1968	-8.8°C12 Apr 1986	69 mm17 Apr 1936	150 mm1936 · driest 2 mm in 2007	82
May	34.4°C29 May 2017	-2.9°C7 May 1979	58 mm23 May 1971	194 mm1984 · driest 12 mm in 1975	82
June	38.0°C27 Jun 2026	-0.5°C3 Jun 1962	60 mm8 Jun 1997	206 mm1997 · driest 17 mm in 1962	82
July	40.3°C25 Jul 2019	2.9°C1 Jul 1984	107 mm14 Jul 2021	217 mm2000 · driest 14 mm in 1983	81
August	38.8°C12 Aug 2003	1.9°C29 Aug 1993	63 mm30 Aug 1968	214 mm2010 · driest 11 mm in 1983	81
September	33.6°C15 Sep 2020	-2.2°C24 Sep 1931	41 mm22 Sep 2004	184 mm1984 · driest 2 mm in 1959	82
October	27.6°C4 Oct 1983	-6.1°C23 Oct 1935	45 mm23 Oct 1982	161 mm1982 · driest 7 mm in 1937	82
November	21.2°C2 Nov 2020	-10.4°C22 Nov 1988	41 mm18 Nov 2004	122 mm2023 · driest 4 mm in 2011	80
December	17.9°C31 Dec 2022	-18.0°C2 Dec 1973	35 mm21 Dec 1991	156 mm1965 · driest 8 mm in 1933	80

Typical days per month at KOLN-BONN, 1991–2020
Month	Days 25°C+	Days 30°C+	Frost nights	Heavy rain (10 mm+)
January	0	0	14	1
February	0	0	13	1
March	0	0	10	1
April	2	0	5	1
May	5	<1	<1	2
June	9	2	0	3
July	15	4	0	3
August	13	4	0	3
September	4	<1	<1	2
October	<1	0	2	2
November	0	0	6	2
December	0	0	12	1

The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 86); on 2011–2025 it is June (88). Both are scored the same way, from the same station — only the climate underneath changed.

How often, not how much — every day in KOLN-BONN’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%	39%	4%	52%	2.0–8.1°C
February	<1%	37%	4%	50%	3.7–10.0°C
March	2%	34%	4%	44%	7.9–13.9°C
April	14%	33%	4%	43%	12.1–17.5°C
May	33%	33%	6%	44%	16.5–21.3°C
June	47%	36%	8%	48%	20.2–24.8°C
July	55%	37%	9%	50%	21.0–26.4°C
August	58%	35%	8%	46%	21.5–26.4°C
September	38%	33%	6%	43%	17.8–22.8°C
October	10%	33%	5%	44%	12.8–17.3°C
November	<1%	38%	5%	52%	7.7–11.7°C
December	0%	40%	5%	56%	2.8–8.4°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.

1934Each stripe is one year’s mean temperature against the 78-year average. Warmest: 2024. Coolest: 1963.2025

The evidence behind this page

Nearby, measured,
and named.

Place identity: GeoNames 2821029
NOAA station: GME00121042 · KOLN-BONN
Station distance: 6.3 km from the place centre
Climate period: 1991–2020
Minimum month coverage: 30 usable years
Daylight: Calculated from latitude 50.81°, 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 KOLN-BONN is what differs

Porz am Rhein→Niederkassel→Wesseling→Lohmar→Rösrath→Zündorf→

Or put two places side by side: Troisdorf vs Porz am Rhein

Best time to visitTroisdorf.

August

July

September

The whole year,without the guesswork.

Troisdorf runs +2.0°Con the 1961–1990 baseline.

Nearby, measured,and named.

Best time to visit
Troisdorf.

The whole year,
without the guesswork.

Troisdorf runs +2.0°C
on the 1961–1990 baseline.

Nearby, measured,
and named.