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
0.4
-1
2
2
4
2
February
-1.8
7
3
2
-4
3
March
6.6
7
2
9
12
10
April
12.7
14
10
15
13
May
20.1
23
19
20
19
June
27.1
27
25
31
28
July
31.5
30
32
34
31
August
30.3
30
33
32
32
September
25.2
25
28
28
24
October
14.6
13
17
17
16
November
7.5
10
4
11
9
December
2.9
8
-4
2
7
Average
13.7
4.4
15.5
15.4
16.9
16.2
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
-10.4
-12
-8
-10
-6
-9
February
-12.9
-4
-8
-11
-15
-8
March
-5.1
-5
-8
-5
-3
-3
April
-1.8
0
-2
0
-2
May
7.0
10
6
5
7
June
12.7
14
12
14
13
July
16.3
15
16
18
15
August
14.6
15
16
15
15
September
10.3
12
12
11
9
October
2.1
2
4
5
3
November
-4.3
-2
-7
-1
-4
December
-8.3
-5
-13
-10
-6
Average
1.1
-7.0
3.1
1.9
2.9
2.5
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
11.9
11
9
16
12
12
February
12.1
13
12
15
14
12
March
12.5
12
11
16
13
13
April
14.2
14
19
13
15
May
12.1
10
14
11
14
June
11.1
9
11
11
12
July
9.7
10
10
10
9
August
9.9
11
9
11
11
September
11.3
10
10
11
13
October
13.9
12
13
13
14
November
12.9
12
15
14
13
December
12.2
12
12
13
13
Average
11.9
11.7
10.9
13.2
12.1
12.4
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
284°
288°
290°
290°
287°
February
292°
294°
295°
298°
283°
March
335°
004°
306°
294°
290°
April
305°
317°
313°
306°
May
106°
292°
111°
140°
June
101°
278°
009°
295°
July
308°
314°
124°
135°
August
317°
343°
281°
021°
September
068°
303°
307°
295°
October
310°
305°
313°
292°
November
296°
288°
289°
278°
December
296°
313°
267°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.