Williamstown Weather Information
Williamstown historical weather data by month.
Chance Of Sunshine
Annual chance of sunshine: 49.12%
Month
% Sunny
Clear Days
Partly Cloudy Days
Cloudy Days
January
35.48%
5
6
20
February
39.29%
5
6
17
March
38.71%
5
7
19
April
45.16%
6
8
17
May
51.61%
6
10
15
June
56.67%
7
10
13
July
62.50%
8
12
12
August
64.52%
8
12
11
September
63.33%
10
9
11
October
56.67%
10
7
13
November
40.00%
6
6
18
December
35.48%
5
6
20
Temperature
Rainfall
Sum Of Heating & Cooling Degree Days
