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
67.3
63
43
80
61
71
February
80.3
63
85
82
81
97
March
81.2
62
80
74
93
87
April
85.0
74
82
79
86
May
87.5
94
78
86
93
June
89.7
85
91
93
83
July
91.8
94
89
83
96
August
89.5
82
83
84
92
September
84.6
84
83
91
87
October
81.0
73
81
83
93
November
74.0
71
70
87
67
December
67.4
56
63
81
65
Average
81.3
62.8
77.9
80.9
84.0
85.9
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
-12.3
-11
-8
-17
-8
-10
February
-11.5
-5
-10
-15
-12
-9
March
-2.0
-3
-4
-3
1
-1
April
4.9
3
3
7
4
May
14.2
19
6
15
15
June
22.2
25
21
23
22
July
25.0
23
24
26
27
August
22.5
22
23
24
23
September
16.2
19
17
18
14
October
7.3
8
9
12
3
November
-4.3
-3
-2
-1
-3
December
-10.2
-3
-13
-11
-9
Average
4.8
-7.5
7.8
5.8
8.0
6.4
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
-19.0
-18
-12
-27
-15
-18
February
-21.3
-15
-20
-26
-23
-20
March
-14.3
-14
-16
-14
-10
-14
April
-7.8
-7
-5
-4
-7
May
3.3
5
2
4
3
June
11.1
14
9
12
11
July
14.2
12
14
14
16
August
12.3
12
13
13
13
September
7.5
10
8
9
6
October
0.8
2
2
5
-3
November
-10.2
-9
-7
-7
-9
December
-18.5
-10
-21
-20
-16
Average
-5.4
-16.4
-2.4
-4.7
-2.3
-3.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
47.1
52
39
38
26
42
February
45.9
58
38
32
37
25
March
32.3
52
31
36
18
26
April
23.9
41
28
15
21
May
13.3
6
5
13
17
June
11.9
7
23
7
13
July
8.1
12
17
4
3
August
8.6
15
12
9
8
September
15.4
9
15
13
16
October
26.6
35
22
13
26
November
51.4
49
46
36
38
December
44.8
43
42
36
42
Average
28.0
53.8
26.0
24.4
16.9
20.7
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
6.8
7
5
8
7
6
February
7.7
7
8
8
8
8
March
7.9
9
7
7
9
8
April
8.1
9
9
9
8
May
7.9
8
10
8
8
June
7.6
7
8
8
8
July
7.5
7
7
7
8
August
7.6
7
7
9
8
September
8.1
8
8
8
9
October
8.1
7
9
8
8
November
7.6
9
9
9
2
December
7.2
8
7
7
7
Average
7.7
7.8
7.5
8.1
7.9
7.5
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
261°
262°
256°
222°
229°
February
290°
264°
271°
246°
268°
March
301°
355°
293°
235°
234°
April
044°
082°
017°
253°
May
188°
169°
242°
237°
June
129°
245°
252°
166°
July
266°
286°
265°
262°
August
255°
256°
228°
227°
September
169°
244°
232°
258°
October
317°
262°
225°
248°
November
262°
289°
272°
276°
December
232°
217°
235°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.