A consolidated reference for Koeln climate: monthly averages, rebuilt from public data on a schedule. Expect 1.4 C at the coldest (Jan) and 19.4 C at the warmest (Jul) — a 18.0 C spread. Expect a wet month and a dry month but no real season: 2.56 mm/day in Aug against 1.47 mm/day in Apr. Taken together that is roughly 789 mm of rain a year for the grid cell. Every run re-reads the source and only rewrites this page when a figure actually changed. Scroll for the month-by-month figures, or jump to a neighbouring location from the links below.
Annual mean temperature 10.1 C
Warmest month Jul (19.4 C)
Coldest month Jan (1.4 C)
Wettest month Aug (2.56 mm/day)
All-time record high 40.2 C
All-time record low -17.1 C
Annual precipitation 792 mm / year
Coordinates 50.9333, 6.95
Population 1,024,621
Average monthly temperature and rainfall in Koeln
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
1.4
2.38
13.3
-14.2
Feb
2.1
2.20
18.8
-17.1
Mar
5.3
1.90
20.9
-8.8
Apr
9.6
1.47
26.2
-5.3
May
13.4
2.07
31.4
-0.8
Jun
17.1
2.28
35.2
4.4
Jul
19.4
2.42
40.2
7.0
Aug
18.9
2.56
37.1
6.0
Sep
15.1
1.89
33.4
3.2
Oct
10.5
1.96
26.9
-4.6
Nov
5.9
2.35
20.0
-6.2
Dec
2.4
2.49
14.4
-13.1
What the Koeln climate table shows
Values are multi-decadal climatological averages for the 50.9333, 6.95 grid cell, not a single year. Rain is the daily mean, so a value of 2.00 mm/day is about 60 mm across a 30-day month. Averages smooth over extremes, so use them for planning rather than for what to pack for next Tuesday.
Frequently asked questions
Why do the numbers differ from a weather app?
An app shows one location on one day. These are long-run averages, so they smooth out single hot or cold spells.
How much rain is 2.56 mm/day in a month?
Rain is recorded as a daily mean, so 2.56 mm/day is roughly 78 mm across a 30-day month.