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
80.5
76
79
81
87
91
February
77.7
77
69
72
81
88
March
79.7
66
82
66
87
87
April
82.1
84
71
80
91
May
87.8
86
79
87
93
June
78.3
73
70
80
82
July
77.6
52
77
88
79
August
83.4
78
86
81
90
September
83.5
69
82
82
88
October
81.0
66
71
85
86
November
81.7
79
72
81
80
December
82.8
88
71
90
68
Average
81.3
72.0
74.3
74.6
83.7
85.6
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
-6.4
-5
-4
-7
-4
-7
February
-6.0
-3
-9
-7
-4
-5
March
-2.9
1
1
-2
-1
-2
April
3.6
5
4
7
3
May
9.9
12
11
10
10
June
15.5
15
17
17
17
July
19.9
22
20
19
20
August
20.1
20
22
21
20
September
15.1
17
17
16
14
October
9.6
11
11
11
8
November
2.3
2
1
6
3
December
-2.0
0
1
-2
0
Average
5.7
-3.6
7.7
7.4
8.1
6.6
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
-16.7
-16
-13
-18
-11
-17
February
-17.8
-12
-22
-18
-13
-14
March
-10.7
-5
-6
-11
-9
-12
April
-3.2
-3
-1
1
-4
May
1.6
2
2
3
2
June
7.6
8
8
9
7
July
11.7
15
12
11
12
August
12.4
12
14
13
11
September
7.4
9
9
9
6
October
2.8
5
5
4
1
November
-5.8
-5
-5
0
-4
December
-10.9
-8
-5
-9
-6
Average
-3.7
-12.9
-1.6
-1.5
0.6
-2.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
31.9
36
33
44
20
19
February
30.4
36
39
46
23
15
March
27.8
42
32
42
21
19
April
22.3
21
40
25
15
May
15.7
16
22
22
11
June
14.4
20
20
11
10
July
10.1
17
15
13
6
August
12.3
33
15
6
7
September
14.7
23
19
19
10
October
12.7
23
11
14
17
November
24.9
36
37
27
15
December
23.6
21
33
20
32
Average
20.1
38.3
25.4
27.6
17.7
13.4
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
11.0
12
11
11
10
10
February
11.5
12
10
13
11
12
March
11.9
12
11
13
12
11
April
11.4
10
12
12
12
May
11.2
11
12
12
11
June
10.0
10
10
10
9
July
9.2
8
10
9
9
August
9.3
10
8
9
10
September
10.3
9
11
11
11
October
10.1
10
10
9
11
November
10.9
9
11
12
11
December
11.6
12
14
11
13
Average
10.8
12.0
10.0
11.1
10.6
10.7
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
302°
013°
308°
001°
347°
February
297°
294°
300°
332°
296°
March
074°
357°
001°
285°
309°
April
252°
044°
073°
266°
May
285°
087°
310°
292°
June
101°
144°
202°
190°
July
151°
233°
211°
180°
August
141°
219°
241°
249°
September
068°
221°
208°
245°
October
065°
215°
035°
241°
November
295°
342°
277°
264°
December
296°
064°
308°
113°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.