Annual mean 11°C · wettest around December · prevailing wind SW
Warmest
21.9 °C
Coldest
5.6 °C
Wettest
31%
Windiest
5.9 m/s
Prevailing
SW
4.9 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Chelmsford over the whole year is 11°C. July is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C. Chelmsford has no sharply defined rainy season: the chance of rain on a given day runs from 14% in April, the driest month, to 24% in December, the wettest. Winds in Chelmsford are highest in February, averaging 4.8 m/s (17 km/h), and lightest in May, at 3.7 m/s (13 km/h). The prevailing wind is from the SW. The clearest skies in Chelmsford come in August, when the sky is typically 47% covered; December is the cloudiest month, at 66%.
Month by month Chelmsford climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
6°C
4°C
2°C
19%
63%
4.3 m/s
0
0
13
February
8°C
5°C
3°C
21%
60%
4.8 m/s
0
0
21
March
10°C
5°C
5°C
23%
59%
4.4 m/s
2
0
34
April
13°C
6°C
8°C
14%
50%
3.9 m/s
10
0
55
May
16°C
10°C
13°C
18%
49%
3.7 m/s
36
1
78
June
20°C
14°C
17°C
16%
48%
3.8 m/s
64
8
76
July
22°C
16°C
19°C
16%
48%
3.7 m/s
76
14
70
August
21°C
15°C
19°C
16%
47%
3.8 m/s
75
11
73
September
19°C
13°C
16°C
17%
49%
3.7 m/s
58
5
79
October
15°C
10°C
11°C
21%
54%
3.9 m/s
20
0
77
November
10°C
7°C
6°C
21%
60%
4.0 m/s
1
0
41
December
8°C
5°C
3°C
24%
66%
4.3 m/s
0
0
23
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Chelmsford weather by season
Year round, Chelmsford has days of about 6°C at their warmest in January, its coolest month, and 22°C in July, its warmest; the coolest hours of the day run from 4°C to 16°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around December and least likely around April. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Chelmsford weather in winterDecember to February
High 7°CLow 5°CRain 21%
Winter in Chelmsford has typical daily highs of about 7°C and lows of about 5°C, with a 21% chance of rain on a given day.
Chelmsford weather in springMarch to May
High 13°CLow 7°CRain 18%
Spring in Chelmsford has typical daily highs of about 13°C and lows of about 7°C, with a 18% chance of rain on a given day.
Chelmsford weather in summerJune to August
High 21°CLow 15°CRain 16%
Summer in Chelmsford has typical daily highs of about 21°C and lows of about 15°C, with a 16% chance of rain on a given day.
Chelmsford weather in autumnSeptember to November
High 14°CLow 10°CRain 20%
Autumn in Chelmsford has typical daily highs of about 14°C and lows of about 10°C, with a 20% chance of rain on a given day.
When is the rainy season in Chelmsford?
Chelmsford has no sharply defined rainy season: the chance of rain on a given day runs from 14% in April, the driest month, to 24% in December, the wettest.
What time of year is Chelmsford windiest?
Winds in Chelmsford are highest in February, averaging 4.8 m/s (17 km/h), and lightest in May, at 3.7 m/s (13 km/h). The prevailing wind is from the SW.
What is the average temperature in Chelmsford year round?
The average temperature in Chelmsford over the whole year is 11°C. July is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C.