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
-3.4
-2
-1
-6
-1
-1
February
-2.0
3
-1
-4
-5
-2
March
2.0
5
1
0
5
3
April
7.2
9
6
9
6
May
14.6
15
15
16
14
June
20.8
19
23
23
22
July
23.6
22
23
23
25
August
23.2
22
24
26
23
September
20.2
22
20
20
18
October
12.5
13
14
16
9
November
4.8
5
7
6
9
December
0.3
4
0
1
1
Average
9.4
2.0
10.9
10.6
11.6
10.5
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
-8.0
-7
-5
-13
-6
-6
February
-10.3
-5
-8
-12
-13
-9
March
-6.4
-3
-6
-7
-4
-3
April
-1.3
1
-1
1
-2
May
4.8
5
5
6
5
June
10.0
10
10
12
10
July
13.7
13
13
14
16
August
14.4
14
15
16
15
September
11.5
13
11
12
10
October
5.1
6
5
9
2
November
-2.4
-1
0
-1
1
December
-6.9
-1
-5
-5
-4
Average
1.5
-5.2
3.3
1.9
3.6
2.8
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
8.6
8
8
10
8
8
February
8.8
9
9
10
8
10
March
9.8
9
10
10
11
9
April
9.0
9
9
9
9
May
7.7
7
8
9
8
June
6.4
5
7
6
7
July
6.4
5
6
7
6
August
7.0
7
7
7
7
September
7.6
7
8
8
8
October
8.5
9
8
7
9
November
8.5
8
8
8
9
December
8.0
8
7
9
8
Average
8.0
8.8
7.4
8.0
7.9
8.2
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
303°
330°
287°
320°
339°
February
290°
317°
320°
294°
311°
March
332°
008°
330°
325°
333°
April
345°
320°
337°
345°
May
002°
073°
346°
348°
June
343°
251°
235°
247°
July
341°
337°
010°
339°
August
339°
318°
216°
353°
September
189°
336°
332°
273°
October
338°
284°
350°
323°
November
275°
256°
280°
264°
December
308°
202°
269°
314°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.