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
73.2
62
72
80
80
59
February
87.3
73
90
82
81
90
March
87.2
87
96
76
86
90
April
92.2
93
85
92
92
May
92.8
91
81
97
94
June
95.5
97
94
99
95
July
95.4
95
100
82
100
August
91.1
86
98
64
100
September
95.8
91
98
98
98
October
85.8
86
81
89
86
November
81.5
87
77
86
78
December
78.6
82
79
69
76
Average
87.0
73.9
89.1
86.4
85.6
88.9
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
-14.5
-11
-12
-19
-10
-12
February
-14.2
-9
-14
-19
-15
-13
March
-5.5
-6
-8
-6
-1
-4
April
3.3
5
2
5
2
May
13.7
17
13
14
13
June
20.9
24
17
21
20
July
22.8
20
23
24
24
August
21.0
21
22
19
23
September
16.2
19
18
19
14
October
6.7
8
8
12
3
November
-4.2
-1
-3
-1
-3
December
-12.9
-3
-12
-14
-11
Average
3.3
-9.7
6.3
4.4
6.0
5.2
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
-19.1
-14
-18
-24
-17
-17
February
-22.6
-15
-23
-28
-24
-20
March
-14.1
-15
-19
-15
-11
-14
April
-6.8
-5
-5
-2
-6
May
5.6
8
6
4
5
June
13.3
16
12
14
13
July
15.6
13
16
14
18
August
13.2
13
14
13
15
September
8.6
10
9
12
7
October
1.3
2
2
5
-1
November
-9.7
-6
-7
-5
-8
December
-17.9
-9
-16
-19
-15
Average
-4.3
-15.2
-2.5
-3.8
-2.6
-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
36.4
39
16
43
17
55
February
29.8
23
21
39
37
30
March
20.8
14
10
28
23
18
April
12.9
11
21
16
13
May
7.1
4
15
7
3
June
6.4
2
11
6
5
July
5.0
3
9
1
5
August
10.1
12
6
28
6
September
6.5
5
3
7
7
October
22.4
16
25
19
34
November
39.6
30
43
23
38
December
34.6
15
31
46
32
Average
19.3
24.9
11.8
21.9
18.5
19.0
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
6.9
8
5
7
6
8
February
7.5
8
7
8
7
8
March
8.2
9
7
8
8
8
April
8.0
8
8
8
9
May
8.0
6
8
9
9
June
7.8
7
9
8
7
July
8.1
8
8
7
8
August
7.8
7
8
8
8
September
8.2
7
9
9
9
October
7.8
5
8
8
9
November
7.8
8
8
8
7
December
7.0
7
7
8
6
Average
7.8
8.1
6.9
8.0
7.9
8.0
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
296°
203°
317°
215°
238°
February
003°
267°
299°
262°
284°
March
319°
284°
286°
171°
226°
April
080°
053°
299°
304°
May
281°
151°
252°
264°
June
192°
303°
273°
255°
July
306°
305°
266°
260°
August
201°
295°
336°
272°
September
188°
255°
240°
284°
October
031°
294°
236°
289°
November
288°
024°
112°
201°
December
217°
067°
289°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.