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
67.5
62
61
58
75
83
February
71.4
55
74
62
74
82
March
72.9
76
81
74
74
70
April
75.0
76
80
75
68
87
May
74.9
73
69
88
58
75
June
0
0
0
0
0
July
84.9
96
80
75
64
85
August
84.2
92
75
86
73
90
September
77.0
62
67
74
87
October
70.9
62
67
67
65
November
71.3
61
75
79
62
December
63.6
50
50
100
100
Average
76.3
78.2
71.6
74.7
69.9
80.0
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
-26.8
-22
-31
-25
-19
-27
February
-29.1
-21
-37
-31
-23
-32
March
-22.3
-19
-18
-21
-26
-23
April
-13.2
-10
-13
-14
-11
-14
May
-4.3
-4
-3
-3
-4
-4
June
4.2
2
3
8
3
3
July
10.7
10
10
16
8
13
August
9.1
11
9
10
7
10
September
2.9
3
4
2
2
October
-4.9
-2
-3
1
-2
November
-14.6
-7
-17
-10
-16
December
-17.0
-14
-15
-18
-15
Average
-8.0
-7.6
-9.8
-8.9
-8.5
-9.4
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
-33.4
-29
-39
-32
-27
-34
February
-36.0
-32
-42
-37
-32
-37
March
-31.8
-27
-28
-29
-34
-33
April
-23.4
-20
-23
-25
-20
-24
May
-11.3
-10
-10
-15
-12
-11
June
-1.7
-3
0
0
-1
-1
July
4.1
3
4
5
3
6
August
3.7
5
4
3
2
4
September
-1.5
1
-1
-1
-1
October
-8.2
-7
-8
-3
-7
November
-21.3
-14
-25
-16
-24
December
-26.1
-23
-25
-25
-25
Average
-15.2
-14.0
-15.4
-16.8
-14.4
-16.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
65.4
56
64
61
59
75
February
59.4
54
36
82
51
34
March
57.9
50
60
60
52
73
April
50.1
38
43
57
68
46
May
36.6
15
28
38
42
63
June
0
0
0
0
0
July
12.6
12
6
16
33
3
August
10.7
6
15
8
27
7
September
21.1
23
36
11
12
October
50.9
32
56
33
54
November
60.8
57
76
59
53
December
63.6
50
50
100
0
Average
38.2
28.7
33.2
44.3
41.0
38.4
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
12.2
14
10
13
11
12
February
11.0
10
9
13
11
12
March
11.4
7
10
13
11
12
April
11.7
12
10
11
13
12
May
11.6
8
15
12
11
15
June
0
0
0
0
0
July
10.9
17
6
9
10
9
August
10.9
13
12
11
11
9
September
12.2
15
12
11
10
October
12.8
11
15
13
13
November
13.3
15
15
12
14
December
16.4
24
12
5
14
Average
11.6
10.8
11.6
12.2
11.4
11.4
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
312°
335°
338°
343°
317°
February
312°
318°
323°
324°
321°
March
324°
351°
326°
307°
312°
April
299°
345°
331°
351°
324°
May
294°
326°
332°
324°
351°
June
360°
360°
360°
360°
360°
July
309°
025°
344°
117°
297°
August
324°
310°
353°
029°
359°
September
026°
032°
039°
359°
October
297°
334°
222°
053°
November
031°
320°
324°
308°
December
134°
096°
026°
300°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.