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
80.6
74
84
78
74
82
February
79.3
70
76
82
83
84
March
86.6
85
86
74
85
88
April
84.7
75
82
83
89
May
90.9
88
94
86
91
June
89.6
86
87
93
81
July
87.6
84
69
94
91
August
90.7
88
87
90
91
September
89.3
88
89
82
93
October
83.3
66
84
88
89
November
80.3
86
79
81
79
December
83.2
78
75
86
85
Average
85.7
76.6
81.8
81.7
86.0
87.3
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
-12.9
-9
-9
-16
-9
-10
February
-10.0
-6
-11
-12
-10
-8
March
-4.4
-2
-5
-4
-1
-3
April
2.7
2
3
6
1
May
12.8
15
15
14
10
June
19.1
22
20
19
18
July
23.0
22
21
22
25
August
21.7
22
22
24
21
September
17.0
21
19
16
16
October
9.4
10
12
14
5
November
-1.0
0
1
1
1
December
-8.1
-3
-7
-9
-7
Average
4.6
-6.3
7.1
6.6
7.2
5.7
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
-21.4
-17
-20
-28
-15
-18
February
-22.1
-17
-25
-27
-23
-19
March
-16.3
-13
-17
-17
-14
-16
April
-8.7
-6
-6
-4
-10
May
1.1
2
4
1
-1
June
6.4
7
9
5
7
July
11.1
11
10
9
14
August
10.2
9
11
12
11
September
7.0
7
7
9
7
October
2.1
4
4
5
-2
November
-8.3
-8
-5
-5
-7
December
-17.7
-11
-17
-19
-15
Average
-6.3
-16.7
-4.1
-4.0
-4.9
-4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
38.6
57
40
32
30
47
February
32.3
40
39
35
24
35
March
26.3
33
37
37
25
19
April
20.4
33
31
13
15
May
12.8
14
12
12
19
June
12.0
0
27
12
13
July
10.2
13
24
9
5
August
8.5
8
17
7
8
September
13.2
6
18
17
17
October
20.7
26
32
12
18
November
40.2
39
52
32
35
December
42.0
44
45
38
48
Average
22.6
42.7
23.5
28.8
17.6
20.3
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
8.5
9
7
11
8
7
February
9.0
8
9
10
8
10
March
9.5
9
9
10
11
10
April
9.6
10
10
8
10
May
8.8
8
9
9
9
June
8.4
8
9
8
9
July
7.7
7
8
7
7
August
8.2
7
8
9
8
September
8.6
7
9
9
10
October
8.5
8
9
7
9
November
9.2
10
10
10
9
December
8.7
9
9
9
9
Average
8.7
8.8
8.2
9.1
8.4
8.8
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
271°
260°
249°
255°
272°
February
295°
250°
258°
229°
260°
March
324°
324°
309°
279°
006°
April
318°
013°
031°
333°
May
346°
127°
269°
343°
June
018°
256°
350°
001°
July
253°
291°
067°
236°
August
320°
224°
233°
236°
September
273°
274°
250°
236°
October
318°
234°
212°
238°
November
247°
270°
245°
244°
December
249°
255°
243°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.