Annual mean 12°C · wettest around May · prevailing wind W
Warmest
28.2 °C
Coldest
0.9 °C
Wettest
68%
Windiest
4.5 m/s
Prevailing
W
3.5 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 Allentown over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C. Allentown has no sharply defined rainy season: the chance of rain on a given day runs from 68% in October, the driest month, to 70% in May, the wettest. Winds in Allentown are highest in March, averaging 3.3 m/s (12 km/h), and lightest in August, at 1.8 m/s (6 km/h). The prevailing wind is from the W. The clearest skies in Allentown come in July, when the sky is typically 36% covered; January is the cloudiest month, at 52%.
Month by month Allentown 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
1°C
-3°C
-4°C
68%
52%
2.9 m/s
0
0
5
February
4°C
-1°C
-1°C
69%
47%
2.7 m/s
2
0
15
March
8°C
2°C
3°C
68%
46%
3.3 m/s
7
0
29
April
14°C
7°C
10°C
68%
49%
3.1 m/s
26
2
54
May
19°C
12°C
17°C
70%
49%
2.5 m/s
55
14
62
June
25°C
17°C
24°C
68%
38%
2.3 m/s
61
39
39
July
28°C
21°C
29°C
68%
36%
1.9 m/s
34
62
10
August
27°C
19°C
27°C
68%
38%
1.8 m/s
48
55
21
September
23°C
15°C
22°C
68%
39%
1.9 m/s
65
30
49
October
17°C
10°C
15°C
68%
46%
2.1 m/s
47
7
68
November
10°C
3°C
5°C
68%
40%
2.5 m/s
11
0
37
December
4°C
0°C
-1°C
69%
52%
2.5 m/s
0
0
11
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 Allentown weather by season
Year round, Allentown has days of about 1°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -3°C to 21°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around May and least likely around October. 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.
Allentown weather in winterDecember to February
High 3°CLow -1°CRain 69%
Winter in Allentown has typical daily highs of about 3°C and lows of about -1°C, with a 69% chance of rain on a given day.
Allentown weather in springMarch to May
High 14°CLow 7°CRain 69%
Spring in Allentown has typical daily highs of about 14°C and lows of about 7°C, with a 69% chance of rain on a given day.
Allentown weather in summerJune to August
High 26°CLow 19°CRain 68%
Summer in Allentown has typical daily highs of about 26°C and lows of about 19°C, with a 68% chance of rain on a given day.
Allentown weather in autumnSeptember to November
High 16°CLow 9°CRain 68%
Autumn in Allentown has typical daily highs of about 16°C and lows of about 9°C, with a 68% chance of rain on a given day.
When is the rainy season in Allentown?
Allentown has no sharply defined rainy season: the chance of rain on a given day runs from 68% in October, the driest month, to 70% in May, the wettest.
What time of year is Allentown windiest?
Winds in Allentown are highest in March, averaging 3.3 m/s (12 km/h), and lightest in August, at 1.8 m/s (6 km/h). The prevailing wind is from the W.
What is the average temperature in Allentown year round?
The average temperature in Allentown over the whole year is 12°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -3°C.