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
77.7
77
78
85
62
79
February
83.0
68
84
89
80
92
March
87.9
75
90
83
93
91
April
83.7
71
70
83
89
May
91.6
90
85
90
96
June
90.9
86
88
93
90
July
94.2
93
92
95
August
90.1
81
84
81
94
September
88.5
84
89
91
87
October
81.8
73
76
82
91
November
77.8
78
80
80
68
December
77.7
69
63
78
86
Average
85.4
72.8
81.9
82.4
83.9
89.3
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
-13.3
-11
-11
-18
-9
-11
February
-11.2
-7
-11
-12
-12
-9
March
-3.1
-4
-5
-4
0
-2
April
4.1
2
4
7
3
May
14.6
18
14
15
14
June
21.3
24
21
21
21
July
24.3
22
23
26
August
21.5
22
22
21
22
September
15.8
19
17
17
14
October
7.3
8
9
13
3
November
-4.4
-3
-2
-1
-2
December
-11.2
-3
-12
-13
-12
Average
4.1
-8.6
7.0
5.3
4.3
6.3
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
-22.2
-19
-19
-29
-16
-21
February
-24.3
-18
-25
-29
-25
-22
March
-18.8
-17
-20
-18
-14
-17
April
-9.5
-10
-8
-5
-9
May
1.4
3
2
2
0
June
9.4
11
10
9
10
July
12.4
11
12
14
August
10.7
10
12
12
12
September
6.3
7
6
8
6
October
0.5
1
1
5
-3
November
-11.9
-10
-7
-7
-9
December
-20.4
-11
-20
-24
-21
Average
-7.4
-19.6
-5.8
-6.0
-6.1
-5.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
34.4
47
54
27
26
27
February
30.4
44
37
23
33
26
March
22.6
43
25
28
15
22
April
21.3
43
39
12
13
May
14.6
17
17
17
19
June
9.2
6
18
11
13
July
8.9
11
19
4
August
9.0
13
12
18
9
September
14.4
10
21
12
23
October
20.3
29
24
10
26
November
44.4
44
42
42
42
December
36.8
36
49
36
48
Average
22.1
44.6
25.3
25.9
19.7
19.4
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
6.0
6
6
7
5
6
February
6.6
6
7
7
7
7
March
7.1
8
6
6
8
7
April
7.8
9
8
8
7
May
7.1
7
8
7
8
June
6.7
6
7
7
7
July
6.5
6
6
7
August
6.4
6
6
6
7
September
6.8
6
7
6
8
October
6.8
6
7
6
7
November
6.9
7
7
7
7
December
6.2
7
6
6
7
Average
6.8
6.6
6.4
6.9
6.8
6.9
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
267°
270°
251°
240°
261°
February
304°
265°
273°
240°
265°
March
331°
348°
304°
279°
335°
April
021°
040°
008°
325°
May
001°
144°
293°
341°
June
069°
301°
355°
072°
July
264°
305°
255°
August
285°
265°
078°
270°
September
228°
266°
237°
262°
October
319°
268°
250°
239°
November
254°
304°
276°
267°
December
240°
024°
256°
251°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.