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
68.0
60
66
49
79
87
February
70.3
53
88
62
68
75
March
70.4
58
83
73
67
74
April
72.5
71
63
75
59
69
May
73.6
56
82
65
81
77
June
77.3
63
76
80
87
54
July
80.5
87
79
91
63
49
August
80.2
76
93
91
87
48
September
75.6
84
81
48
52
October
73.7
82
71
66
57
November
74.9
59
78
76
76
December
70.1
66
63
77
67
Average
74.6
66.2
77.7
75.8
71.0
63.3
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
2020
January
-20.4
-18
-11
-24
-18
-18
February
-24.0
-21
-29
-27
-21
-23
March
-17.5
-17
-20
-17
-16
-18
April
-9.4
-6
-8
-10
-8
-10
May
0.3
2
7
0
-1
-2
June
8.6
10
13
9
9
7
July
16.2
17
15
17
17
14
August
15.0
17
16
16
14
15
September
8.5
11
10
8
7
October
1.1
3
3
4
-1
November
-10.8
-7
0
-5
-12
December
-16.6
-11
0
-19
-17
Average
-4.6
-2.1
-2.4
-2.1
-3.0
-5.1
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
-28.4
-28
-25
-30
-25
-26
February
-32.6
-29
-36
-34
-29
-30
March
-25.0
-26
-28
-24
-25
-26
April
-17.0
-15
-17
-19
-17
-17
May
-6.3
-3
-1
-4
-7
-9
June
2.0
3
4
3
3
0
July
7.3
8
8
9
8
2
August
7.7
9
9
8
7
8
September
3.6
5
4
5
3
October
-4.9
-2
-1
1
-4
November
-18.6
-14
-18
-12
-19
December
-25.8
-20
-25
-25
-23
Average
-11.3
-11.8
-10.4
-11.7
-10.4
-12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
69.2
72
78
83
52
71
February
69.6
72
70
78
61
71
March
56.5
60
50
65
53
67
April
32.8
29
17
28
50
57
May
21.1
20
14
31
25
14
June
10.1
15
14
14
11
7
July
8.9
10
22
7
5
5
August
11.3
11
11
18
15
6
September
15.7
10
14
32
18
October
20.2
14
25
19
14
November
50.2
41
40
45
36
December
61.6
46
67
67
61
Average
29.9
30.7
26.6
32.5
32.2
30.0
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
13.1
15
11
18
10
12
February
13.4
13
12
16
15
14
March
13.9
15
11
15
15
14
April
12.7
12
9
11
16
15
May
13.0
12
12
13
13
14
June
11.6
12
12
12
12
10
July
11.6
10
13
11
13
11
August
13.0
12
11
14
15
12
September
13.9
13
14
14
15
October
12.9
11
9
13
14
November
12.9
14
11
12
12
December
12.6
13
5
14
15
Average
12.8
12.4
11.7
12.6
13.6
13.0
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
332°
322°
322°
326°
327°
February
324°
323°
320°
318°
326°
March
344°
350°
327°
326°
328°
April
033°
352°
006°
302°
018°
May
075°
164°
037°
344°
344°
June
035°
141°
034°
322°
103°
July
270°
028°
017°
308°
095°
August
341°
314°
349°
301°
147°
September
239°
305°
077°
353°
October
290°
317°
238°
322°
November
314°
326°
338°
319°
December
283°
291°
344°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.