Annual mean 10°C · wettest around September · prevailing wind NE
Warmest
30.2 °C
Coldest
3.1 °C
Wettest
77%
Windiest
4.0 m/s
Prevailing
NE
3.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Thornton over the whole year is 10°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -5°C. Thornton has no sharply defined rainy season: the chance of rain on a given day runs from 18% in January, the driest month, to 35% in September, the wettest. Winds in Thornton are highest in April, averaging 3.2 m/s (12 km/h), and lightest in September, at 2.2 m/s (8 km/h). The prevailing wind is from the NE. The clearest skies in Thornton come in September, when the sky is typically 25% covered; May is the cloudiest month, at 43%.
Month by month Thornton 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
4°C
-5°C
-1°C
18%
33%
2.4 m/s
0
0
13
February
5°C
-4°C
-1°C
24%
34%
2.8 m/s
2
0
20
March
10°C
-1°C
4°C
21%
39%
3.0 m/s
8
0
38
April
14°C
3°C
9°C
24%
40%
3.2 m/s
25
0
57
May
18°C
9°C
15°C
34%
43%
2.7 m/s
51
5
70
June
26°C
15°C
23°C
24%
30%
2.6 m/s
68
42
42
July
30°C
17°C
27°C
22%
27%
2.5 m/s
49
72
15
August
28°C
15°C
26°C
22%
27%
2.4 m/s
62
64
24
September
25°C
11°C
22°C
35%
25%
2.2 m/s
71
33
50
October
17°C
4°C
12°C
31%
27%
2.4 m/s
44
2
66
November
10°C
-0°C
6°C
23%
26%
2.4 m/s
14
0
44
December
6°C
-4°C
1°C
28%
27%
2.5 m/s
1
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 Thornton weather by season
Year round, Thornton has days of about 4°C at their warmest in January, its coolest month, and 30°C in July, its warmest; the coolest hours of the day run from -5°C to 17°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around September and least likely around January. 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.
Thornton weather in winterDecember to February
High 5°CLow -4°CRain 23%
Winter in Thornton has typical daily highs of about 5°C and lows of about -4°C, with a 23% chance of rain on a given day.
Thornton weather in springMarch to May
High 14°CLow 4°CRain 26%
Spring in Thornton has typical daily highs of about 14°C and lows of about 4°C, with a 26% chance of rain on a given day.
Thornton weather in summerJune to August
High 28°CLow 16°CRain 23%
Summer in Thornton has typical daily highs of about 28°C and lows of about 16°C, with a 23% chance of rain on a given day.
Thornton weather in autumnSeptember to November
High 17°CLow 5°CRain 30%
Autumn in Thornton has typical daily highs of about 17°C and lows of about 5°C, with a 30% chance of rain on a given day.
When is the rainy season in Thornton?
Thornton has no sharply defined rainy season: the chance of rain on a given day runs from 18% in January, the driest month, to 35% in September, the wettest.
What time of year is Thornton windiest?
Winds in Thornton are highest in April, averaging 3.2 m/s (12 km/h), and lightest in September, at 2.2 m/s (8 km/h). The prevailing wind is from the NE.
What is the average temperature in Thornton year round?
The average temperature in Thornton over the whole year is 10°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -5°C.