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
80.7
77
63
75
86
83
February
87.5
84
78
75
79
93
March
91.3
85
89
87
89
94
April
93.6
85
94
94
88
May
95.1
94
94
96
95
June
93.3
80
97
99
96
July
90.4
57
92
100
94
August
89.6
73
86
89
93
September
91.6
80
99
82
94
October
74.7
62
74
81
82
November
79.5
68
85
76
84
December
87.8
79
88
87
90
Average
88.2
81.8
75.8
88.4
89.7
91.1
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
-19.7
-22
-15
-21
-16
-23
February
-16.7
-13
-18
-17
-21
-15
March
-7.9
-8
-7
-8
-8
-8
April
4.7
7
3
4
4
May
17.3
24
15
14
14
June
22.0
23
24
25
21
July
24.6
27
25
26
23
August
22.6
25
25
22
21
September
16.1
18
20
15
15
October
4.4
5
8
6
2
November
-11.9
-6
-10
-10
-11
December
-18.8
-12
-19
-23
-16
Average
1.6
-15.2
6.1
4.6
2.9
2.0
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
-25.0
-29
-20
-26
-23
-30
February
-25.1
-22
-27
-27
-30
-24
March
-19.6
-18
-19
-19
-21
-21
April
-8.4
-5
-10
-9
-8
May
4.1
8
2
3
2
June
10.0
11
10
12
10
July
12.3
14
13
13
11
August
10.5
12
12
10
11
September
4.2
7
5
6
4
October
-3.1
-3
-1
-2
-5
November
-17.2
-12
-17
-16
-19
December
-25.7
-19
-28
-30
-23
Average
-9.5
-24.8
-5.6
-7.6
-8.9
-8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
38.6
51
48
40
26
34
February
34.6
24
45
41
40
30
March
22.8
22
26
29
29
17
April
13.4
18
13
18
23
May
9.6
8
16
8
14
June
13.4
15
9
4
16
July
7.5
5
5
6
16
August
8.2
6
9
12
11
September
6.9
7
3
15
6
October
20.5
8
26
8
34
November
31.5
25
25
37
33
December
25.7
23
27
34
15
Average
18.9
32.7
16.6
17.4
16.7
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
4.7
4
4
7
4
4
February
5.4
4
5
6
7
6
March
5.9
6
6
6
6
7
April
6.8
7
7
7
7
May
5.9
6
6
6
6
June
6.0
6
6
7
5
July
5.5
4
5
6
6
August
5.4
5
5
6
5
September
5.1
4
5
5
5
October
5.4
5
6
5
6
November
5.2
5
6
5
5
December
4.3
5
4
4
5
Average
5.5
4.7
5.1
6.0
5.7
5.7
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
338°
332°
343°
092°
325°
February
346°
342°
348°
334°
326°
March
004°
012°
343°
343°
333°
April
341°
341°
339°
339°
May
220°
008°
095°
359°
June
322°
336°
328°
177°
July
006°
268°
294°
329°
August
314°
193°
343°
335°
September
322°
278°
354°
305°
October
317°
322°
198°
321°
November
338°
341°
331°
330°
December
284°
344°
315°
300°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.