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
82.6
74
78
82
94
86
February
87.8
89
75
83
88
94
March
90.4
81
89
85
94
90
April
93.6
96
85
99
93
May
95.2
87
98
97
96
June
94.4
79
99
99
98
July
94.0
85
98
93
94
August
94.7
89
92
97
97
September
94.1
83
97
93
97
October
94.2
98
95
98
91
November
88.9
85
92
83
93
December
84.6
100
63
79
82
Average
91.0
80.8
86.4
90.4
93.5
93.2
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
-11.8
-13
-7
-13
-6
-12
February
-9.4
-2
-8
-11
-13
-5
March
1.4
-1
-3
1
15
-3
April
8.3
11
7
10
6
May
19.0
25
15
17
17
June
22.7
24
23
25
21
July
24.9
25
26
26
24
August
23.2
23
26
24
23
September
17.4
21
21
18
16
October
8.5
10
13
10
4
November
-4.8
0
-3
0
-4
December
-9.6
0
-14
-17
-6
Average
6.4
-6.5
10.1
8.3
9.2
6.8
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
-19.4
-21
-14
-22
-15
-20
February
-20.0
-13
-20
-23
-24
-17
March
-13.5
-13
-16
-12
-9
-15
April
-4.2
-2
-4
-4
-6
May
4.8
8
3
4
4
June
10.1
11
10
12
9
July
11.9
12
12
13
12
August
10.6
11
12
10
11
September
5.2
7
7
7
5
October
-2.9
0
2
0
-3
November
-11.4
-7
-12
-9
-12
December
-17.0
-10
-22
-25
-13
Average
-5.1
-16.2
-2.4
-4.5
-4.7
-4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
27.1
35
25
37
14
23
February
23.6
19
36
40
24
16
March
18.4
26
31
28
11
16
April
13.9
15
26
9
16
May
7.9
3
24
5
7
June
10.2
13
10
6
16
July
8.2
13
7
5
14
August
7.8
14
8
4
11
September
7.6
2
8
11
12
October
12.8
19
4
2
27
November
29.9
22
44
28
27
December
26.1
7
49
44
28
Average
15.8
27.0
16.2
22.1
11.6
16.6
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
6.2
5
6
7
6
7
February
6.6
6
7
6
7
8
March
7.5
9
7
8
8
8
April
8.1
9
9
7
8
May
7.9
8
9
8
7
June
7.3
7
7
8
7
July
6.8
7
7
7
7
August
7.0
7
7
7
9
September
7.3
7
7
9
7
October
8.3
8
9
9
8
November
7.2
7
8
7
7
December
6.5
6
9
6
7
Average
7.2
6.8
7.1
7.7
7.6
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
306°
070°
326°
164°
325°
February
289°
310°
315°
289°
285°
March
044°
080°
327°
278°
323°
April
128°
349°
307°
300°
May
144°
059°
043°
005°
June
309°
009°
263°
156°
July
304°
261°
249°
278°
August
263°
280°
271°
255°
September
233°
270°
263°
291°
October
238°
250°
200°
280°
November
300°
315°
109°
290°
December
219°
313°
289°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.