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
64.3
54
62
46
72
71
February
64.7
53
59
61
64
62
March
67.7
56
70
70
75
73
April
74.2
71
70
82
68
69
May
74.1
61
77
84
73
79
June
89.2
90
83
93
94
88
July
90.5
88
89
94
91
86
August
87.1
89
92
96
85
83
September
74.9
72
73
56
83
October
73.6
80
74
57
87
November
68.3
57
71
65
82
December
59.6
59
39
63
48
Average
76.7
72.4
75.4
78.5
74.1
78.1
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
-24.7
-19
-22
-27
-18
-22
February
-28.3
-24
-33
-31
-23
-27
March
-20.8
-18
-21
-20
-20
-20
April
-11.4
-8
-10
-11
-10
-12
May
-1.0
1
4
0
-2
-4
June
9.3
10
11
12
9
9
July
16.5
18
17
18
15
16
August
14.4
17
16
15
13
15
September
7.5
9
9
7
7
October
-1.5
2
0
3
-2
November
-13.1
-9
-14
-8
-15
December
-20.9
-12
-20
-19
-20
Average
-6.8
-3.2
-4.2
-6.8
-5.6
-7.8
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
-31.3
-29
-29
-32
-27
-30
February
-34.0
-31
-38
-36
-31
-33
March
-28.7
-26
-28
-27
-28
-29
April
-20.9
-16
-18
-20
-18
-19
May
-8.7
-5
-3
-5
-8
-11
June
1.8
2
3
3
2
1
July
7.9
8
9
9
7
9
August
7.7
9
9
8
7
9
September
2.7
4
3
4
3
October
-5.4
-2
-4
1
-5
November
-20.1
-16
-22
-16
-21
December
-27.8
-22
-26
-26
-26
Average
-13.8
-12.9
-11.2
-12.2
-11.0
-13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
91.6
94
92
98
76
91
February
92.8
98
99
92
64
99
March
80.5
81
99
80
76
82
April
46.9
31
36
34
68
65
May
25.1
15
16
20
21
34
June
8.5
8
11
14
7
8
July
9.2
7
11
7
8
5
August
13.1
12
10
13
20
8
September
20.1
11
20
29
28
October
33.6
14
30
27
45
November
75.3
77
84
64
75
December
87.1
81
97
77
80
Average
39.6
35.4
37.6
38.7
38.1
43.1
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
13.2
15
12
18
10
12
February
12.5
13
11
15
13
13
March
13.5
14
11
15
14
14
April
12.3
12
8
11
15
14
May
12.7
11
12
13
12
15
June
10.9
12
11
12
11
9
July
11.5
12
11
11
13
11
August
12.4
12
11
13
15
11
September
13.6
13
14
12
14
October
14.7
13
18
13
15
November
13.6
15
14
12
13
December
12.7
12
12
14
13
Average
12.6
12.1
11.4
13.5
13.0
12.7
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
340°
345°
336°
341°
323°
February
339°
334°
328°
317°
338°
March
357°
005°
333°
347°
327°
April
041°
358°
354°
029°
018°
May
086°
340°
039°
344°
346°
June
028°
141°
053°
330°
017°
July
307°
032°
001°
330°
078°
August
003°
302°
343°
326°
119°
September
221°
314°
092°
014°
October
299°
348°
237°
336°
November
327°
343°
358°
318°
December
349°
012°
351°
330°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.