Annual mean 11°C · wettest around March · prevailing wind SW
Warmest
27.6 °C
Coldest
-2.9 °C
Wettest
32%
Windiest
6.0 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
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 Glen Ellyn over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C. Glen Ellyn has no sharply defined rainy season: the chance of rain on a given day runs from 24% in November, the driest month, to 27% in March, the wettest. Winds in Glen Ellyn are highest in March, averaging 4.8 m/s (17 km/h), and lightest in August, at 3.1 m/s (11 km/h). The prevailing wind is from the SW. The clearest skies in Glen Ellyn come in August, when the sky is typically 46% covered; January is the cloudiest month, at 69%.
Month by month Glen Ellyn 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
-2°C
-5°C
-8°C
24%
69%
4.5 m/s
0
0
1
February
1°C
-3°C
-5°C
24%
59%
4.6 m/s
1
0
8
March
7°C
2°C
1°C
27%
61%
4.8 m/s
4
0
21
April
12°C
6°C
7°C
26%
61%
4.7 m/s
19
1
46
May
19°C
13°C
16°C
27%
58%
4.1 m/s
50
13
62
June
26°C
19°C
24°C
24%
48%
3.7 m/s
60
40
39
July
27°C
21°C
28°C
25%
47%
3.2 m/s
50
57
19
August
27°C
20°C
27°C
24%
46%
3.1 m/s
56
54
24
September
24°C
16°C
22°C
24%
48%
3.3 m/s
68
32
51
October
16°C
10°C
12°C
26%
54%
3.9 m/s
36
5
62
November
8°C
3°C
2°C
24%
58%
4.2 m/s
7
0
26
December
2°C
-2°C
-4°C
26%
65%
4.3 m/s
0
0
6
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 Glen Ellyn weather by season
Year round, Glen Ellyn has days of about -2°C at their warmest in January, its coolest month, and 27°C in July, its warmest; the coolest hours of the day run from -5°C to 21°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around March and least likely around November. 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.
Glen Ellyn weather in winterDecember to February
High 0°CLow -3°CRain 25%
Winter in Glen Ellyn has typical daily highs of about 0°C and lows of about -3°C, with a 25% chance of rain on a given day.
Glen Ellyn weather in springMarch to May
High 13°CLow 7°CRain 26%
Spring in Glen Ellyn has typical daily highs of about 13°C and lows of about 7°C, with a 26% chance of rain on a given day.
Glen Ellyn weather in summerJune to August
High 27°CLow 20°CRain 24%
Summer in Glen Ellyn has typical daily highs of about 27°C and lows of about 20°C, with a 24% chance of rain on a given day.
Glen Ellyn weather in autumnSeptember to November
High 16°CLow 10°CRain 25%
Autumn in Glen Ellyn has typical daily highs of about 16°C and lows of about 10°C, with a 25% chance of rain on a given day.
When is the rainy season in Glen Ellyn?
Glen Ellyn has no sharply defined rainy season: the chance of rain on a given day runs from 24% in November, the driest month, to 27% in March, the wettest.
What time of year is Glen Ellyn windiest?
Winds in Glen Ellyn are highest in March, averaging 4.8 m/s (17 km/h), and lightest in August, at 3.1 m/s (11 km/h). The prevailing wind is from the SW.
What is the average temperature in Glen Ellyn year round?
The average temperature in Glen Ellyn over the whole year is 11°C. July is the hottest month, with highs of about 27°C; January is the coldest, with lows of about -5°C.