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
84.9
95
76
86
90
78
February
86.9
89
87
78
86
91
March
82.9
72
80
77
90
88
April
86.5
92
83
77
91
May
91.2
92
85
92
98
June
90.9
72
91
95
95
July
93.4
86
96
94
90
August
94.8
85
93
97
97
September
91.6
83
86
87
98
October
90.5
87
86
90
93
November
87.9
89
83
94
86
December
89.7
91
73
96
82
Average
89.0
83.3
84.8
85.8
90.8
91.5
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
-5.7
-3
-2
-7
-2
-5
February
-4.3
-1
-5
-5
-3
-3
March
0.6
2
1
0
3
0
April
5.7
7
6
8
5
May
13.5
14
15
14
15
June
19.9
18
20
22
22
July
23.9
25
24
22
23
August
23.4
21
24
26
23
September
18.2
20
18
18
19
October
12.4
14
15
13
11
November
3.7
3
4
6
6
December
-1.2
2
1
0
2
Average
8.2
-1.4
9.8
9.9
10.5
9.7
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
-14.7
-13
-10
-17
-9
-13
February
-14.0
-12
-17
-15
-11
-13
March
-9.9
-5
-6
-9
-9
-10
April
-3.7
-2
-1
0
-4
May
2.4
3
3
3
4
June
8.7
10
9
10
10
July
12.9
16
13
11
14
August
12.4
12
14
14
12
September
7.9
10
8
10
7
October
3.0
5
4
4
2
November
-4.4
-4
-3
-2
-3
December
-8.2
-5
-4
-7
-6
Average
-2.7
-10.3
1.0
0.3
1.3
-1.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
30.5
29
35
31
22
36
February
25.8
26
24
36
24
21
March
28.4
40
27
36
18
26
April
19.9
11
25
33
11
May
15.0
19
20
17
6
June
12.1
26
11
11
9
July
7.9
11
11
11
10
August
9.8
25
12
7
6
September
15.3
22
22
27
5
October
13.8
27
11
14
9
November
22.5
36
21
13
18
December
22.9
25
38
16
32
Average
19.2
32.4
23.0
21.1
17.5
13.8
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
7.2
8
6
7
7
6
February
8.1
8
8
7
8
8
March
8.8
8
8
9
10
9
April
8.2
8
9
7
9
May
8.1
9
8
7
10
June
7.0
6
7
7
7
July
6.6
7
7
6
6
August
6.3
6
6
6
7
September
6.7
6
7
7
7
October
7.1
6
7
5
8
November
7.9
8
8
7
7
December
8.0
8
8
9
8
Average
7.5
7.8
7.1
7.4
7.0
7.7
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
290°
301°
286°
303°
304°
February
296°
295°
299°
297°
293°
March
038°
012°
301°
297°
307°
April
024°
330°
027°
326°
May
335°
014°
344°
320°
June
079°
079°
107°
061°
July
085°
291°
096°
099°
August
074°
075°
073°
292°
September
053°
311°
289°
249°
October
004°
253°
044°
274°
November
280°
288°
276°
277°
December
288°
350°
284°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.