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
January
65.5
68
65
February
89.4
96
89
March
81.6
87
76
April
88.7
89
May
June
July
98.2
98
August
92.5
93
September
89.8
87
94
October
92.0
86
98
November
90.2
97
84
December
65.8
70
60
Average
85.1
84.2
84.4
86.6
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
January
-5.4
-1
-6
February
-3.4
-4
-2
March
2.7
7
-2
April
7.8
8
May
June
July
30.6
31
August
28.4
29
September
24.5
25
23
October
16.0
15
17
November
6.3
9
4
December
1.6
5
-3
Average
7.9
4.2
9.8
9.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-13.1
-11
-14
February
-14.3
-14
-14
March
-9.6
-5
-11
April
-2.3
-2
May
June
July
17.3
17
August
15.7
16
September
11.5
12
10
October
3.6
4
3
November
-4.2
-3
-5
December
-8.9
-4
-11
Average
-4.9
-8.8
-1.0
-2.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
22.3
26
21
February
9.9
4
11
March
17.4
14
21
April
14.1
14
May
June
July
0.0
0
August
1.8
2
September
4.3
5
3
October
3.7
5
3
November
13.2
7
20
December
16.2
10
26
Average
12.2
15.0
10.0
11.6
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
January
10.0
10
10
February
11.2
13
11
March
12.3
13
12
April
12.7
13
May
June
July
6.8
7
August
7.8
8
September
8.3
8
10
October
11.0
11
11
November
12.5
12
13
December
10.5
9
13
Average
11.3
12.2
10.2
11.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
327°
314°
February
314°
312°
March
335°
339°
April
327°
May
June
July
052°
August
332°
September
105°
280°
October
302°
279°
November
282°
296°
December
284°
304°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.