Annual mean 10°C · wettest around May · prevailing wind SW
Warmest
27.2 °C
Coldest
-4.2 °C
Wettest
62%
Windiest
6.0 m/s
Prevailing
SW
4.6 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 Janesville over the whole year is 10°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -7°C. Janesville has no sharply defined rainy season: the chance of rain on a given day runs from 67% in February, the driest month, to 75% in May, the wettest. Winds in Janesville are highest in April, averaging 4.3 m/s (15 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW. The clearest skies in Janesville come in July, when the sky is typically 45% covered; January is the cloudiest month, at 65%.
Month by month Janesville 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
-7°C
-9°C
69%
65%
3.7 m/s
0
0
1
February
-1°C
-6°C
-7°C
67%
54%
3.9 m/s
1
0
5
March
6°C
-0°C
-0°C
74%
57%
4.1 m/s
2
0
16
April
12°C
4°C
6°C
74%
59%
4.3 m/s
15
0
41
May
19°C
11°C
16°C
75%
55%
3.5 m/s
48
10
62
June
25°C
18°C
24°C
74%
47%
3.2 m/s
62
36
40
July
27°C
19°C
27°C
73%
45%
2.5 m/s
54
55
21
August
26°C
17°C
26°C
74%
47%
2.4 m/s
61
48
28
September
23°C
14°C
21°C
73%
47%
2.8 m/s
65
26
53
October
15°C
8°C
11°C
73%
53%
3.3 m/s
30
3
56
November
7°C
1°C
1°C
71%
55%
3.7 m/s
6
0
21
December
0°C
-3°C
-5°C
69%
63%
3.7 m/s
0
0
4
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 Janesville weather by season
Year round, Janesville has days of about -4°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -7°C to 19°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around May and least likely around February. 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.
Janesville weather in winterDecember to February
High -1°CLow -5°CRain 68%
Winter in Janesville has typical daily highs of about -1°C and lows of about -5°C, with a 68% chance of rain on a given day.
Janesville weather in springMarch to May
High 12°CLow 5°CRain 74%
Spring in Janesville has typical daily highs of about 12°C and lows of about 5°C, with a 74% chance of rain on a given day.
Janesville weather in summerJune to August
High 26°CLow 18°CRain 73%
Summer in Janesville has typical daily highs of about 26°C and lows of about 18°C, with a 73% chance of rain on a given day.
Janesville weather in autumnSeptember to November
High 15°CLow 8°CRain 72%
Autumn in Janesville has typical daily highs of about 15°C and lows of about 8°C, with a 72% chance of rain on a given day.
When is the rainy season in Janesville?
Janesville has no sharply defined rainy season: the chance of rain on a given day runs from 67% in February, the driest month, to 75% in May, the wettest.
What time of year is Janesville windiest?
Winds in Janesville are highest in April, averaging 4.3 m/s (15 km/h), and lightest in August, at 2.4 m/s (9 km/h). The prevailing wind is from the SW.
What is the average temperature in Janesville year round?
The average temperature in Janesville over the whole year is 10°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -7°C.