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
72.9
63
80
76
65
76
February
74.2
64
70
71
80
78
March
77.8
75
74
67
82
82
April
81.7
73
74
89
82
May
87.4
87
83
92
89
June
84.1
66
73
92
89
July
90.0
81
82
95
91
August
87.1
77
90
93
86
September
84.9
81
84
81
90
October
76.8
63
81
76
76
November
67.8
68
63
74
72
December
69.4
66
60
76
64
Average
80.2
67.6
74.0
75.4
84.5
82.7
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
-11.5
-8
-8
-16
-9
-9
February
-9.8
-5
-9
-11
-8
-7
March
-3.9
0
-4
-3
2
-1
April
5.5
7
5
11
4
May
14.2
17
16
16
13
June
21.1
24
20
22
22
July
24.0
24
22
23
26
August
21.5
21
22
24
21
September
16.9
20
18
16
15
October
9.1
11
11
13
5
November
-2.6
-2
1
1
2
December
-8.5
-4
-6
-8
-7
Average
5.6
-5.7
8.1
7.1
9.0
7.0
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
-21.7
-16
-19
-29
-15
-18
February
-21.0
-16
-23
-27
-22
-18
March
-15.6
-12
-15
-15
-12
-15
April
-7.8
-5
-5
-4
-8
May
1.0
2
2
1
0
June
7.8
9
8
8
9
July
11.1
11
10
9
14
August
9.7
9
10
13
8
September
6.2
7
5
8
6
October
1.1
3
2
3
-3
November
-9.9
-9
-6
-5
-6
December
-17.9
-13
-15
-18
-15
Average
-6.7
-15.5
-4.5
-5.6
-3.6
-4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
46.7
60
44
41
41
47
February
44.6
56
51
50
35
39
March
35.7
40
54
48
24
26
April
25.4
39
37
13
21
May
16.3
23
18
10
21
June
11.6
10
24
9
10
July
9.0
12
17
6
11
August
8.6
12
15
5
6
September
13.9
17
18
16
17
October
27.9
40
29
10
31
November
57.0
64
68
47
44
December
50.6
43
60
45
62
Average
28.0
51.8
33.7
34.5
18.6
24.6
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
7.6
7
7
9
7
8
February
8.6
9
8
10
8
9
March
9.5
9
9
9
11
9
April
8.7
8
9
8
9
May
8.3
9
7
8
9
June
8.0
7
8
8
7
July
7.1
6
8
8
5
August
6.5
7
7
8
1
September
7.3
7
8
9
6
October
7.7
8
9
6
7
November
8.8
9
9
9
8
December
7.8
8
8
8
9
Average
8.0
8.4
7.8
8.4
8.1
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
246°
285°
253°
290°
265°
February
285°
228°
266°
268°
256°
March
278°
318°
298°
279°
266°
April
283°
301°
334°
301°
May
318°
261°
294°
312°
June
350°
262°
286°
257°
July
271°
274°
296°
252°
August
312°
246°
238°
302°
September
298°
292°
238°
243°
October
308°
206°
184°
240°
November
251°
259°
243°
220°
December
256°
276°
212°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.