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
81.1
89
72
66
93
83
February
88.6
90
85
81
85
93
March
89.6
94
88
88
89
86
April
93.6
98
90
92
98
May
93.4
87
89
97
92
June
92.8
83
90
98
89
July
90.7
68
94
91
95
August
89.9
91
96
96
86
September
88.8
71
100
87
85
October
86.6
82
94
80
87
November
82.5
81
92
67
88
December
91.4
85
94
95
92
Average
89.7
91.2
82.6
90.1
90.0
89.6
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
-14.5
-16
-11
-15
-11
-19
February
-10.8
-4
-11
-11
-14
-7
March
-1.5
1
-1
0
-1
-2
April
8.5
11
5
9
9
May
18.7
24
15
17
16
June
22.4
25
23
25
20
July
24.3
26
24
25
23
August
23.3
27
26
23
21
September
17.4
20
21
17
16
October
8.2
9
12
8
5
November
-8.5
-3
-8
-8
-9
December
-14.4
-9
-17
-21
-12
Average
5.0
-7.4
9.0
7.1
5.7
5.0
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
-21.2
-25
-17
-22
-19
-26
February
-21.7
-17
-20
-21
-26
-18
March
-14.0
-14
-14
-12
-14
-15
April
-5.9
-2
-7
-5
-4
May
5.1
7
3
4
4
June
9.7
11
10
11
10
July
11.7
13
12
12
13
August
10.3
11
12
10
11
September
3.9
6
5
4
4
October
-3.7
-3
0
-3
-5
November
-15.4
-10
-16
-15
-17
December
-21.1
-17
-26
-28
-19
Average
-7.7
-19.4
-4.9
-5.5
-6.4
-6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
34.4
38
25
45
20
43
February
30.5
19
36
39
35
23
March
24.2
16
34
27
28
29
April
15.6
11
19
17
6
May
9.1
3
18
13
15
June
10.2
5
10
5
15
July
9.5
5
8
10
18
August
8.1
6
6
7
13
September
6.0
3
4
8
13
October
10.8
2
10
7
18
November
26.2
19
26
32
33
December
21.2
9
24
20
20
Average
16.7
23.0
11.8
17.7
15.3
19.2
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
3.0
3
2
4
3
2
February
4.0
4
3
4
4
5
March
4.2
4
4
4
5
6
April
5.7
5
6
6
6
May
5.3
5
6
5
6
June
5.3
6
5
5
5
July
4.9
4
5
5
5
August
4.8
5
4
5
5
September
4.4
5
4
4
5
October
4.5
4
5
4
5
November
3.4
3
4
3
3
December
2.7
3
4
2
3
Average
4.4
3.7
4.2
4.6
4.5
4.7
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
328°
301°
315°
231°
347°
February
293°
037°
351°
308°
279°
March
340°
349°
344°
334°
328°
April
304°
334°
329°
292°
May
239°
334°
028°
326°
June
274°
299°
290°
299°
July
293°
239°
271°
284°
August
247°
246°
268°
263°
September
228°
224°
238°
257°
October
233°
275°
189°
289°
November
210°
267°
307°
270°
December
195°
307°
210°
151°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.