Annual mean 12°C · wettest around December · prevailing wind SW
Warmest
22.5 °C
Coldest
6.1 °C
Wettest
23%
Windiest
5.3 m/s
Prevailing
SW
4.5 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 Harrow on the Hill over the whole year is 12°C. July is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C. Harrow on the Hill has no sharply defined rainy season: the chance of rain on a given day runs from 11% in April, the driest month, to 20% in December, the wettest. Winds in Harrow on the Hill are highest in February, averaging 4.3 m/s (15 km/h), and lightest in September, at 3.4 m/s (12 km/h). The prevailing wind is from the SW. The clearest skies in Harrow on the Hill come in April, when the sky is typically 48% covered; December is the cloudiest month, at 67%.
Month by month Harrow on the Hill 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
7°C
4°C
2°C
17%
62%
3.9 m/s
0
0
17
February
8°C
5°C
4°C
17%
61%
4.3 m/s
0
0
28
March
10°C
6°C
5°C
17%
60%
4.1 m/s
3
0
41
April
13°C
7°C
9°C
11%
48%
3.6 m/s
14
1
64
May
17°C
11°C
14°C
13%
49%
3.5 m/s
42
2
83
June
20°C
14°C
18°C
12%
49%
3.7 m/s
68
12
75
July
22°C
16°C
20°C
13%
49%
3.6 m/s
78
17
70
August
22°C
15°C
19°C
12%
48%
3.5 m/s
79
13
73
September
19°C
13°C
17°C
14%
51%
3.4 m/s
64
6
81
October
15°C
11°C
12°C
19%
56%
3.5 m/s
25
0
82
November
10°C
7°C
6°C
17%
61%
3.5 m/s
2
0
49
December
8°C
6°C
4°C
20%
67%
3.9 m/s
0
0
29
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 Harrow on the Hill weather by season
Year round, Harrow on the Hill has days of about 7°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 12°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.
Harrow on the Hill weather in winterDecember to February
High 8°CLow 5°CRain 18%
Winter in Harrow on the Hill has typical daily highs of about 8°C and lows of about 5°C, with a 18% chance of rain on a given day.
Harrow on the Hill weather in springMarch to May
High 14°CLow 8°CRain 14%
Spring in Harrow on the Hill has typical daily highs of about 14°C and lows of about 8°C, with a 14% chance of rain on a given day.
Harrow on the Hill weather in summerJune to August
High 21°CLow 15°CRain 12%
Summer in Harrow on the Hill has typical daily highs of about 21°C and lows of about 15°C, with a 12% chance of rain on a given day.
Harrow on the Hill weather in autumnSeptember to November
High 15°CLow 10°CRain 16%
Autumn in Harrow on the Hill has typical daily highs of about 15°C and lows of about 10°C, with a 16% chance of rain on a given day.
When is the rainy season in Harrow on the Hill?
Harrow on the Hill has no sharply defined rainy season: the chance of rain on a given day runs from 11% in April, the driest month, to 20% in December, the wettest.
What time of year is Harrow on the Hill windiest?
Winds in Harrow on the Hill are highest in February, averaging 4.3 m/s (15 km/h), and lightest in September, at 3.4 m/s (12 km/h). The prevailing wind is from the SW.
What is the average temperature in Harrow on the Hill year round?
The average temperature in Harrow on the Hill over the whole year is 12°C. July is the hottest month, with highs of about 22°C; January is the coldest, with lows of about 4°C.