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
-7.0
-9
-7
-8
-5
-7
February
-8.2
-2
-6
-8
-13
-1
March
0.1
-2
-6
-1
8
4
April
9.4
5
6
12
10
May
20.6
23
19
18
20
June
24.7
27
25
26
24
July
26.8
26
26
29
25
August
26.1
24
27
26
28
September
20.6
18
24
24
21
October
10.9
11
13
14
8
November
0.0
2
-3
4
2
December
-5.4
3
-12
-9
-2
Average
8.3
-5.6
10.0
9.7
11.3
11.0
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
-17.1
-18
-16
-20
-14
-16
February
-19.4
-12
-17
-21
-22
-14
March
-11.0
-12
-18
-10
-6
-8
April
-5.7
-5
-3
-4
-7
May
3.6
7
4
2
3
June
9.7
12
9
10
9
July
11.7
10
12
13
12
August
9.6
8
12
11
10
September
5.1
5
6
6
5
October
-3.9
-1
0
0
-3
November
-10.8
-7
-11
-7
-9
December
-15.4
-9
-20
-19
-13
Average
-5.6
-14.1
-3.5
-3.1
-3.5
-3.3
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
10.6
10
8
13
11
11
February
10.8
11
12
12
12
10
March
11.4
10
10
13
11
11
April
12.2
12
14
10
13
May
11.4
9
12
11
12
June
11.2
9
12
12
13
July
8.7
9
8
8
9
August
8.5
9
8
9
8
September
10.5
10
10
12
11
October
11.7
11
12
11
12
November
10.8
10
13
11
11
December
10.0
10
10
12
9
Average
10.6
10.5
9.8
11.4
10.7
11.0
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
279°
290°
286°
243°
262°
February
261°
281°
289°
285°
264°
March
325°
126°
288°
225°
274°
April
067°
004°
313°
301°
May
108°
297°
248°
167°
June
211°
279°
283°
280°
July
296°
360°
100°
252°
August
283°
221°
308°
256°
September
173°
257°
275°
287°
October
303°
295°
226°
288°
November
253°
286°
257°
255°
December
251°
308°
271°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.