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
81.6
87
74
76
90
81
February
84.8
90
85
77
87
89
March
82.8
71
84
73
86
89
April
86.6
87
86
92
90
May
93.2
99
91
95
93
June
92.0
86
90
95
96
July
92.4
84
95
95
87
August
91.3
83
93
91
94
September
90.6
81
88
91
97
October
88.1
83
89
90
88
November
87.7
87
86
95
89
December
83.5
79
78
77
89
Average
87.8
81.2
84.6
86.0
91.0
90.5
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
-4.2
-3
-2
-7
-3
-3
February
-3.9
0
-2
-3
-2
-2
March
2.1
4
3
2
4
3
April
8.9
11
9
12
8
May
17.5
18
20
18
17
June
22.1
21
22
24
24
July
25.7
27
26
23
26
August
24.2
22
25
26
25
September
19.9
21
19
20
20
October
13.4
15
16
14
11
November
4.1
4
6
5
7
December
-2.8
2
2
0
1
Average
9.7
0.4
11.7
11.7
11.8
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
-15.5
-14
-10
-20
-11
-14
February
-15.2
-12
-17
-15
-15
-15
March
-8.0
-5
-6
-8
-8
-9
April
-2.9
0
-1
0
-3
May
4.4
4
5
4
4
June
10.1
11
10
12
10
July
14.0
15
14
12
15
August
12.8
12
14
15
12
September
8.2
10
8
10
6
October
3.2
6
3
4
2
November
-5.4
-5
-3
-4
-2
December
-11.8
-6
-5
-10
-7
Average
-2.8
-11.8
1.3
0.5
0.7
0.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
32.9
28
45
36
25
34
February
22.3
15
20
34
22
20
March
25.1
38
29
32
16
19
April
18.6
12
26
20
15
May
12.3
15
11
11
13
June
10.5
20
12
6
5
July
5.9
6
5
8
6
August
7.8
17
10
6
5
September
10.1
15
9
14
2
October
12.3
17
8
9
16
November
20.2
23
22
15
13
December
27.2
40
40
26
16
Average
17.1
28.2
19.9
18.5
13.5
12.5
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
7.6
8
7
8
7
7
February
7.9
9
7
9
7
8
March
8.8
8
8
8
10
9
April
8.7
8
9
10
10
May
8.5
9
8
8
9
June
7.2
6
7
8
7
July
6.2
5
7
7
6
August
6.0
6
5
5
7
September
6.7
5
6
8
9
October
7.2
7
6
6
8
November
7.9
8
8
7
7
December
8.0
7
11
8
8
Average
7.6
8.1
6.9
7.4
7.4
7.9
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
287°
337°
311°
322°
328°
February
293°
323°
295°
303°
277°
March
306°
338°
292°
276°
320°
April
241°
325°
347°
308°
May
324°
249°
314°
297°
June
047°
235°
243°
227°
July
186°
257°
271°
193°
August
251°
241°
212°
266°
September
324°
296°
240°
232°
October
239°
202°
332°
255°
November
276°
271°
280°
251°
December
311°
340°
284°
248°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.