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
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
0.5
0
3
-1
1
-2
February
0.0
1
-1
1
0
1
March
2.5
5
1
3
6
2
April
7.1
7
8
8
6
May
12.8
13
14
13
14
June
19.1
18
19
23
20
July
23.0
24
25
21
22
August
23.5
22
24
25
24
September
20.0
20
20
21
21
October
14.8
16
17
15
15
November
8.4
7
10
10
10
December
2.9
5
5
2
6
Average
10.3
1.7
11.3
12.4
12.3
11.9
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
-6.2
-5
-3
-10
-3
-7
February
-8.5
-6
-9
-8
-6
-8
March
-4.3
-1
-4
-3
-4
-4
April
1.0
1
2
2
0
May
5.5
5
7
6
6
June
11.6
12
12
14
12
July
16.4
18
17
16
16
August
16.9
16
18
18
17
September
13.5
15
14
14
13
October
8.6
10
10
9
8
November
1.9
1
4
3
3
December
-3.9
-1
0
-3
0
Average
3.8
-4.1
5.1
5.6
5.8
5.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
13.0
14
13
14
12
12
February
12.6
12
12
13
14
10
March
12.1
12
11
12
12
13
April
10.6
9
12
12
11
May
9.8
11
7
10
11
June
8.7
10
8
9
9
July
7.5
7
8
9
7
August
8.0
9
7
7
10
September
10.0
9
11
10
10
October
10.9
9
8
11
12
November
13.5
13
14
12
12
December
14.1
14
16
15
14
Average
10.7
12.6
10.4
10.0
10.5
10.5
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
305°
323°
294°
333°
245°
February
314°
311°
287°
299°
243°
March
242°
337°
277°
287°
245°
April
311°
308°
342°
010°
May
303°
333°
320°
239°
June
083°
196°
229°
189°
July
187°
251°
289°
138°
August
217°
176°
242°
284°
September
327°
304°
239°
272°
October
292°
243°
332°
286°
November
280°
284°
274°
263°
December
298°
026°
287°
253°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.