Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
January
78.2
71
69
70
February
79.0
68
72
73
March
80.2
74
70
71
April
80.0
73
73
May
81.5
75
75
June
79.3
72
78
July
85.7
75
77
89
August
79.9
89
71
34
September
77.4
69
21
October
56.0
70
19
November
59.2
71
67
21
December
61.3
70
70
38
Average
71.0
71.2
72.0
72.0
40.8
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
3.0
2
4
7
February
5.0
6
4
6
March
8.0
8
3
11
April
12.1
14
10
May
19.4
22
18
June
23.4
23
24
July
31.6
30
32
34
August
29.8
34
33
27
September
24.5
28
25
October
16.7
17
17
November
8.3
11
3
11
December
4.4
9
-1
3
Average
13.4
5.3
13.5
15.8
18.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-9.5
-11
-5
-7
February
-7.4
-4
-7
-10
March
-4.7
-4
-7
-3
April
-1.8
-1
-3
May
4.9
6
2
June
9.8
10
7
July
13.2
11
10
16
August
10.3
13
9
9
September
7.5
7
7
October
3.1
2
3
November
-4.5
-2
-7
-1
December
-8.6
-3
-12
-9
Average
2.1
-7.8
0.3
-1.8
3.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
0.0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
May
0.0
0
0
June
0.0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
October
0.0
0
0
November
0.0
0
0
0
December
0.0
0
0
0
Average
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
January
4.6
2
3
4
February
4.8
3
3
4
March
4.4
2
3
3
April
4.3
3
3
May
3.5
2
3
June
3.1
2
3
July
4.1
2
2
6
August
4.8
1
3
6
September
5.0
3
8
October
4.3
3
7
November
4.4
3
3
10
December
4.3
3
3
8
Average
4.5
2.5
2.6
2.9
7.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
199°
218°
233°
February
231°
229°
248°
March
212°
327°
276°
April
251°
287°
May
083°
265°
June
038°
231°
July
230°
239°
202°
August
318°
258°
229°
September
227°
220°
October
249°
236°
November
214°
231°
235°
December
222°
228°
224°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.