If you only need Cardiff climate: monthly averages, the figures and table here are the whole story. Cardiff runs from 4.9 C in Feb to 16.4 C in Jul, a swing of 11.5 C. Rain is spread through the year, with Nov the wettest month at 3.42 mm/day and Apr the driest at 1.86 mm/day. Taken together that is roughly 964 mm of rain a year for the grid cell. The same build that regenerates the sitemap refreshes these values, and unchanged pages are left untouched. The table underneath carries the per-month breakdown; the related pages cover the same dataset nearby.
Annual mean temperature 10.3 C
Warmest month Jul (16.4 C)
Coldest month Feb (4.9 C)
Wettest month Nov (3.42 mm/day)
All-time record high 30.8 C
All-time record low -5.8 C
Annual precipitation 967 mm / year
Coordinates 51.48, -3.18
Population 372,089
Average monthly temperature and rainfall in Cardiff
Month
Mean temp (C)
Rain (mm/day)
Record high (C)
Record low (C)
Jan
5.1
3.03
12.8
-5.5
Feb
4.9
2.60
14.2
-5.8
Mar
6.2
2.27
17.3
-5.7
Apr
8.7
1.86
21.3
-2.5
May
11.7
2.15
22.9
1.5
Jun
14.7
2.39
27.1
5.3
Jul
16.4
2.58
30.8
8.7
Aug
16.3
2.72
29.2
7.6
Sep
14.4
2.11
25.2
5.3
Oct
11.4
3.23
23.2
0.4
Nov
8.1
3.42
17.1
-3.6
Dec
5.9
3.36
13.4
-5.7
What the Cardiff climate table shows
Values are multi-decadal climatological averages for the 51.48, -3.18 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
Does Cardiff get the same every year?
Close to it. Averaging decades smooths variation, so treat these as typical rather than guaranteed.