Saint Helena, California
ID: USC00047643 Latitude: 38.5067 Longitude: -122.4714
Elevation: 225.1 feet ( 68.6 meters)
Source: NOAA Climate Normals 1991-2020
Precipitation Total: 33.97 in., 13.37 cm.
Monthly Data Table for Saint Helena, California
Monthly Data from NOAA Monthly Normals 2006-2020
Imperial Units
Statistic |
Units |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Maximum Temperature |
°F |
60.3 |
63.7 |
66.8 |
72.7 |
78.5 |
86.7 |
89.1 |
88.7 |
87.2 |
78.4 |
66.8 |
59.0 |
Minimum Temperature |
°F |
40.3 |
41.9 |
43.7 |
46.9 |
50.8 |
54.4 |
56.3 |
56.2 |
54.4 |
50.0 |
43.9 |
39.7 |
Heating Degree Days |
°F |
455.8 |
342.4 |
304.3 |
176.7 |
76.4 |
12.1 |
0.8 |
0.5 |
8.0 |
83.7 |
293.6 |
484.9 |
Cooling Degree Days |
°F |
0.1 |
0.8 |
2.1 |
20.7 |
65.7 |
178.4 |
239.5 |
231.4 |
181.8 |
58.9 |
4.1 |
0.0 |
Precipitation |
I |
5.1 |
5.8 |
5.0 |
2.0 |
1.0 |
0.3 |
0.0 |
0.0 |
0.1 |
1.6 |
2.5 |
5.4 |
Metric Units
Statistic |
Units |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Maximum Temperature |
°C |
15.7 |
17.6 |
19.3 |
22.6 |
25.8 |
30.4 |
31.7 |
31.5 |
30.7 |
25.8 |
19.3 |
15.0 |
Minimum Temperature |
°C |
4.6 |
5.5 |
6.5 |
8.3 |
10.4 |
12.4 |
13.5 |
13.4 |
12.4 |
10.0 |
6.6 |
4.3 |
Heating Degree Days |
°C |
235.4 |
172.4 |
151.3 |
80.4 |
24.7 |
-11.1 |
-17.3 |
-17.5 |
-13.3 |
28.7 |
145.3 |
251.6 |
Cooling Degree Days |
°C |
-17.7 |
-17.3 |
-16.6 |
-6.3 |
18.7 |
81.3 |
115.3 |
110.8 |
83.2 |
14.9 |
-15.5 |
-17.8 |
Precipitation |
M |
12.9 |
14.8 |
12.6 |
5.2 |
2.5 |
0.9 |
0.0 |
0.0 |
0.2 |
4.1 |
6.3 |
13.8 |