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
92.0
89
89
95
0
February
87.7
89
89
88
March
88.6
85
79
94
95
100
April
89.0
90
88
89
100
May
92.4
100
98
87
96
June
97.9
100
99
97
July
99.6
100
100
100
August
98.1
90
98
100
100
September
92.5
92
100
97
October
91.0
87
91
90
November
93.1
96
88
94
December
91.6
94
85
95
Average
92.7
87.6
89.7
94.4
94.5
96.4
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
2.3
1
3
5
-2
February
2.5
5
4
3
March
5.9
6
0
9
8
7
April
10.5
11
8
11
22
May
16.5
22
15
16
16
June
22.6
22
28
22
July
28.0
28
31
26
August
27.3
28
29
28
29
September
21.3
23
25
23
October
12.5
13
15
12
November
6.6
10
2
9
December
3.5
9
-2
6
Average
13.5
3.8
10.4
13.7
20.2
17.8
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
-9.0
-11
-7
-9
-2
February
-10.8
-6
-8
-10
March
-5.2
-6
-9
-4
-3
7
April
-2.3
-2
-4
-2
20
May
4.2
5
3
3
4
June
8.7
8
10
9
July
12.7
12
15
10
August
11.8
14
13
15
12
September
7.2
8
9
7
October
0.6
0
3
-1
November
-5.8
-3
-8
-4
December
-7.6
-4
-13
-4
Average
1.1
-8.4
-2.3
0.4
5.8
4.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.7
16
0
0
0
February
9.1
17
0
0
March
6.0
18
0
0
6
0
April
5.6
0
0
9
0
May
4.0
0
0
2
6
June
2.6
0
0
5
July
0.6
0
0
1
August
1.6
8
0
0
1
September
4.6
7
0
2
October
7.4
14
0
13
November
3.8
4
0
7
December
5.9
7
0
5
Average
5.5
16.7
4.3
2.8
4.6
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
8.9
8
8
11
0
February
10.0
9
10
13
March
9.1
8
8
12
11
27
April
10.3
9
13
10
10
May
9.1
6
10
9
9
June
9.0
9
10
9
July
7.4
8
7
8
August
7.6
8
8
9
8
September
8.3
8
9
10
October
9.4
8
9
10
November
9.6
8
11
11
December
8.6
7
8
9
Average
8.8
8.4
8.2
10.0
9.0
9.0
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
299°
300°
292°
360°
February
289°
297°
302°
March
300°
322°
300°
289°
278°
April
296°
303°
306°
313°
May
117°
297°
303°
288°
June
278°
310°
301°
July
305°
320°
294°
August
272°
312°
311°
307°
September
287°
280°
299°
October
299°
300°
299°
November
282°
293°
282°
December
292°
306°
291°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.