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
2020
January
78.3
78
71
87
79
71
February
91.0
84
90
92
85
92
March
90.8
95
91
82
93
92
April
94.0
94
94
98
93
May
90.4
90
84
93
93
June
91.3
91
99
94
82
July
94.4
95
96
87
96
August
93.9
93
95
89
94
September
91.4
84
98
99
97
October
86.5
87
96
83
94
November
75.9
69
63
81
79
December
82.4
83
82
86
83
Average
88.9
86.2
87.4
89.9
89.7
89.4
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
2020
January
-14.7
-13
-12
-18
-10
-12
February
-12.2
-7
-12
-15
-15
-9
March
-4.4
-5
-7
-4
1
-5
April
4.3
6
3
6
1
May
14.2
19
12
12
13
June
20.2
24
19
22
17
July
23.6
22
24
25
24
August
21.7
22
23
21
22
September
15.8
19
18
18
14
October
5.8
7
9
10
2
November
-6.5
-2
-6
-2
-6
December
-12.9
-4
-15
-17
-8
Average
3.5
-9.9
7.1
4.9
5.9
4.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-21.6
-18
-17
-26
-18
-19
February
-23.4
-16
-24
-27
-26
-20
March
-16.6
-17
-21
-15
-12
-16
April
-7.6
-6
-6
-5
-9
May
3.4
7
3
1
2
June
11.2
14
10
13
10
July
14.3
13
15
16
15
August
13.1
14
15
13
14
September
8.1
11
10
10
6
October
0.4
2
2
4
-1
November
-11.0
-8
-11
-8
-13
December
-19.5
-12
-22
-23
-18
Average
-6.8
-17.1
-3.9
-4.2
-3.1
-4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
51.9
66
41
59
50
43
February
42.5
40
47
34
51
40
March
25.4
21
19
36
16
36
April
16.6
7
19
14
30
May
15.0
9
25
14
12
June
15.4
7
12
10
30
July
7.5
11
8
3
7
August
8.5
10
8
5
11
September
9.5
4
6
5
15
October
24.4
22
12
16
43
November
52.4
47
61
34
45
December
43.0
16
39
57
38
Average
25.3
40.4
17.9
23.4
19.7
26.9
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
2020
January
6.0
7
5
7
5
5
February
6.6
6
7
7
7
7
March
7.1
7
6
7
8
7
April
7.3
7
7
8
8
May
7.1
6
8
7
7
June
6.9
7
8
7
6
July
6.9
7
7
7
7
August
7.0
7
7
6
8
September
7.4
7
8
8
8
October
7.9
6
9
7
8
November
7.1
7
8
7
6
December
5.7
6
6
6
5
Average
6.9
6.7
6.5
7.4
7.0
7.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
317°
287°
319°
267°
234°
February
343°
286°
293°
303°
271°
March
345°
325°
312°
191°
325°
April
096°
052°
325°
307°
May
120°
005°
024°
074°
June
165°
005°
289°
060°
July
322°
286°
229°
237°
August
280°
228°
274°
237°
September
211°
235°
252°
287°
October
299°
289°
280°
286°
November
268°
001°
283°
283°
December
242°
351°
300°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.