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
74.4
74
71
79
February
84.6
79
86
90
March
86.0
87
75
95
April
86.7
92
87
81
May
95.7
95
96
June
94.2
91
98
July
97.2
97
98
August
92.1
89
95
September
90.9
86
96
October
92.5
91
97
88
November
93.3
97
86
98
December
74.9
74
68
82
Average
88.0
83.6
87.2
91.7
89.3
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
-7.2
-6
-7
-8
February
-2.7
5
-4
-5
March
2.2
6
-2
3
April
9.5
14
7
7
May
21.6
24
19
June
27.8
29
27
July
28.1
28
29
August
27.1
27
28
September
24.4
25
24
October
15.0
14
18
13
November
5.5
8
2
7
December
-1.1
4
-5
-3
Average
8.5
4.8
12.6
12.2
4.6
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
-16.4
-13
-14
-20
February
-13.2
-7
-15
-17
March
-9.5
-6
-13
-6
April
-1.6
2
-2
-1
May
9.5
11
9
June
15.4
16
15
July
15.5
14
17
August
12.4
9
16
September
10.0
10
11
October
2.7
3
3
3
November
-5.3
-4
-6
-4
December
-11.9
-6
-14
-12
Average
-3.6
-7.9
0.7
1.0
-6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
15.9
14
16
18
February
11.4
9
11
15
March
12.6
16
23
1
April
14.1
10
16
16
May
6.1
7
6
June
2.8
4
1
July
1.9
2
2
August
4.7
6
4
September
2.7
4
2
October
7.0
7
4
15
November
8.5
4
20
1
December
16.2
11
29
15
Average
9.5
12.0
8.7
7.9
9.5
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
9.4
10
8
10
February
10.7
9
11
12
March
11.4
12
11
11
April
13.6
14
12
15
May
10.9
11
11
June
8.7
8
10
July
8.4
8
9
August
8.2
8
9
September
8.5
7
10
October
10.5
10
11
11
November
10.2
10
11
9
December
9.6
9
12
9
Average
10.3
11.2
9.4
10.7
9.8
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
259°
237°
257°
February
245°
227°
276°
March
353°
008°
347°
April
004°
344°
340°
May
144°
225°
June
126°
229°
July
265°
250°
August
266°
209°
September
132°
198°
October
290°
242°
242°
November
258°
263°
258°
December
240°
298°
259°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.