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
74.4
70
63
80
65
75
February
83.8
76
69
83
78
93
March
84.7
69
83
87
91
87
April
89.1
91
79
83
91
May
88.8
92
83
85
91
June
85.7
88
83
84
76
July
83.9
82
79
68
85
August
88.5
65
94
94
90
September
90.1
88
89
100
92
October
80.2
59
82
90
86
November
76.7
77
68
82
75
December
69.9
50
58
82
70
Average
83.4
71.4
76.9
81.5
83.8
85.1
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
-15.8
-12
-10
-19
-10
-14
February
-14.4
-9
-17
-16
-14
-12
March
-5.2
-6
-7
-5
-2
-4
April
2.9
3
3
5
1
May
12.5
17
12
12
11
June
19.7
24
19
19
19
July
23.1
21
23
23
25
August
20.6
21
22
20
21
September
15.0
19
17
17
13
October
6.1
7
8
11
2
November
-6.7
-3
-4
-2
-5
December
-13.9
-4
-13
-16
-12
Average
2.8
-9.0
7.1
4.5
5.2
3.7
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
-23.2
-21
-20
-30
-18
-22
February
-25.0
-21
-28
-30
-27
-24
March
-18.0
-19
-21
-19
-15
-19
April
-9.0
-9
-8
-6
-10
May
0.4
3
2
0
-1
June
8.1
11
7
8
8
July
11.7
11
11
11
14
August
10.8
11
11
10
12
September
6.5
10
7
9
5
October
0.2
1
1
4
-3
November
-12.7
-10
-10
-7
-12
December
-20.0
-12
-20
-24
-19
Average
-8.8
-21.8
-4.8
-6.0
-5.7
-6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
44.9
57
58
41
43
42
February
30.9
51
34
25
32
27
March
30.5
53
30
29
24
32
April
16.8
24
29
20
14
May
15.3
13
25
21
21
June
13.6
7
27
15
14
July
11.5
24
19
7
7
August
9.9
13
14
10
12
September
12.5
6
21
6
20
October
26.1
31
24
18
39
November
53.9
53
54
44
61
December
46.5
56
55
40
47
Average
25.7
53.4
27.0
28.3
21.0
24.9
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
6.2
7
2
8
6
6
February
6.1
7
9
0
7
8
March
6.5
8
6
0
8
7
April
6.5
7
2
8
8
May
7.1
6
8
7
8
June
6.5
6
7
7
6
July
6.7
7
6
6
7
August
6.9
6
7
7
7
September
7.5
6
8
8
8
October
7.7
6
9
7
8
November
6.9
10
0
9
8
December
6.3
8
0
7
8
Average
6.9
7.4
6.1
4.9
7.1
7.3
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
295°
288°
280°
261°
258°
February
325°
278°
360°
271°
281°
March
323°
303°
130°
296°
263°
April
029°
060°
319°
304°
May
071°
249°
296°
340°
June
164°
293°
257°
127°
July
281°
302°
263°
245°
August
286°
276°
250°
238°
September
234°
278°
248°
287°
October
346°
278°
268°
271°
November
296°
360°
289°
283°
December
263°
360°
272°
273°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.