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
72.9
71
60
68
77
88
February
77.2
79
72
66
79
80
March
83.9
85
78
69
96
84
April
85.8
78
81
97
95
May
93.7
96
87
96
99
June
90.7
82
88
93
97
July
92.1
81
94
96
94
August
92.1
82
93
92
96
September
90.5
83
87
97
93
October
87.2
79
92
86
89
November
83.0
85
76
85
84
December
80.5
78
77
78
81
Average
86.2
78.4
79.7
82.0
90.3
91.0
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
-6.6
-4
-3
-10
-4
-4
February
-4.9
1
-4
-5
-4
-3
March
1.8
5
3
1
3
3
April
9.4
11
10
14
9
May
19.0
20
21
19
19
June
23.4
23
23
26
25
July
26.3
26
26
24
28
August
24.7
24
25
28
24
September
20.4
23
19
21
18
October
13.6
16
15
15
11
November
3.6
4
6
5
6
December
-3.8
1
2
-2
0
Average
9.6
0.4
11.9
11.5
12.0
11.3
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
-15.9
-12
-10
-22
-11
-12
February
-14.2
-10
-15
-16
-15
-14
March
-8.9
-4
-6
-8
-7
-6
April
-1.8
1
0
2
-2
May
6.3
6
7
6
6
June
11.8
13
12
14
12
July
15.2
17
14
14
17
August
14.2
13
15
17
14
September
9.6
11
9
11
7
October
4.1
7
2
6
2
November
-4.0
-4
-2
-3
-2
December
-11.9
-6
-5
-11
-7
Average
-1.8
-9.4
2.2
1.0
1.8
1.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
33.4
42
51
39
23
17
February
29.7
25
42
38
32
22
March
23.0
20
35
45
11
15
April
19.5
24
26
12
18
May
10.4
16
15
7
3
June
12.6
19
22
9
3
July
8.5
21
10
3
6
August
7.8
17
12
2
8
September
8.0
12
14
5
9
October
14.3
30
9
11
17
November
22.3
24
36
18
10
December
29.9
39
40
30
29
Average
17.7
29.1
26.6
24.5
12.1
11.8
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
7.4
8
8
7
6
7
February
8.0
6
8
9
7
9
March
8.2
8
8
8
8
8
April
8.6
9
9
8
9
May
8.3
9
8
8
9
June
7.7
7
7
8
9
July
7.0
6
8
7
7
August
6.6
6
7
7
7
September
6.3
6
6
6
7
October
7.0
6
7
6
7
November
6.9
7
7
6
7
December
6.7
7
9
6
7
Average
7.4
7.6
7.1
7.6
7.1
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
260°
017°
347°
355°
314°
February
239°
008°
310°
247°
226°
March
337°
334°
313°
241°
054°
April
105°
011°
027°
352°
May
327°
191°
253°
248°
June
063°
219°
217°
215°
July
198°
220°
202°
206°
August
225°
222°
215°
227°
September
201°
340°
245°
225°
October
225°
207°
044°
233°
November
233°
216°
238°
244°
December
016°
032°
338°
273°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.