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
75.1
65
61
84
79
74
February
85.3
74
76
85
83
93
March
90.4
82
87
88
94
87
April
93.5
100
84
97
89
May
87.6
89
68
94
89
June
91.8
93
95
90
85
July
94.1
93
91
88
96
August
93.2
88
95
84
96
September
91.3
73
96
100
95
October
82.6
79
79
83
89
November
77.6
76
65
86
76
December
74.6
73
56
80
76
Average
86.4
73.7
82.7
83.1
88.7
88.0
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
-14.7
-12
-12
-19
-9
-13
February
-13.5
-7
-12
-16
-15
-10
March
-3.0
-4
-6
-4
0
-4
April
5.1
6
4
7
3
May
15.0
20
14
13
14
June
21.7
26
20
21
20
July
24.0
22
24
26
25
August
22.3
23
23
21
23
September
16.4
20
19
19
14
October
6.7
8
8
11
3
November
-5.6
-2
-4
-1
-5
December
-12.9
-3
-13
-15
-9
Average
3.8
-8.3
7.5
5.4
4.7
5.1
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
-22.1
-19
-20
-28
-18
-20
February
-25.9
-18
-26
-29
-27
-21
March
-17.8
-17
-21
-17
-13
-16
April
-7.2
-6
-6
-4
-10
May
2.6
5
3
2
1
June
10.1
13
9
11
9
July
13.4
12
13
15
15
August
12.0
13
13
12
13
September
7.1
10
8
9
5
October
-1.5
1
0
2
-3
November
-12.2
-9
-10
-9
-12
December
-20.7
-12
-20
-23
-19
Average
-7.6
-18.3
-4.8
-5.4
-6.6
-5.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
36.7
46
50
41
21
41
February
23.8
36
39
24
18
17
March
16.5
25
20
25
9
26
April
12.0
4
27
8
22
May
10.8
5
32
6
7
June
9.9
2
19
10
13
July
7.6
16
9
2
8
August
8.1
11
7
13
10
September
8.9
14
9
3
14
October
19.2
17
31
11
28
November
31.1
41
38
11
29
December
25.1
16
36
32
21
Average
17.7
35.8
19.0
23.9
11.8
18.1
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
6.1
7
5
7
6
7
February
6.8
7
7
7
7
7
March
7.7
8
7
7
9
8
April
7.7
7
8
8
7
May
8.1
7
9
8
8
June
6.8
6
8
7
7
July
6.7
7
6
7
6
August
6.4
6
7
6
6
September
6.9
7
8
8
7
October
6.9
5
9
6
7
November
6.6
7
7
7
6
December
5.9
7
6
5
5
Average
6.9
6.9
6.5
7.3
7.0
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
300°
231°
299°
212°
199°
February
322°
243°
267°
255°
252°
March
341°
277°
258°
185°
206°
April
055°
029°
273°
288°
May
126°
070°
251°
214°
June
185°
339°
268°
124°
July
305°
290°
296°
224°
August
239°
244°
269°
233°
September
197°
231°
235°
283°
October
337°
317°
176°
288°
November
261°
002°
278°
225°
December
232°
002°
289°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.