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
-2.9
-1
1
-1
0
-2
February
-3.7
-1
-3
-2
-1
-3
March
0.0
2
0
0
1
-1
April
4.3
5
4
6
4
May
9.7
11
11
10
11
June
16.0
15
17
19
17
July
20.6
21
22
19
20
August
21.8
19
22
22
21
September
17.5
18
18
18
18
October
12.3
14
14
13
12
November
6.3
5
7
8
7
December
1.8
3
4
2
4
Average
7.6
0.3
7.4
9.8
9.7
9.1
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
-6.0
-5
-4
-7
-3
-7
February
-8.2
-5
-9
-8
-5
-8
March
-5.3
-2
-4
-5
-5
-6
April
-1.6
0
0
1
-1
May
3.8
4
5
5
4
June
9.9
9
11
12
11
July
15.3
16
16
14
15
August
16.8
16
18
17
16
September
12.5
14
13
13
12
October
7.6
9
9
9
7
November
1.4
1
3
4
2
December
-3.5
-1
0
-3
-1
Average
2.6
-5.9
2.7
4.6
4.9
3.8
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
14.4
15
13
15
13
13
February
14.6
14
14
16
16
14
March
13.8
13
13
12
15
14
April
12.8
12
13
12
13
May
12.4
14
11
12
14
June
11.2
12
9
12
11
July
10.0
9
11
11
9
August
10.5
12
10
10
12
September
12.1
6
12
13
13
October
12.1
11
11
11
13
November
14.9
13
16
14
14
December
15.2
16
15
16
14
Average
12.7
13.8
12.3
12.1
12.6
12.6
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
285°
329°
281°
330°
320°
February
306°
294°
276°
296°
262°
March
187°
353°
258°
251°
316°
April
312°
321°
042°
296°
May
278°
300°
283°
268°
June
090°
196°
211°
200°
July
155°
231°
239°
185°
August
123°
212°
231°
253°
September
257°
296°
220°
232°
October
271°
230°
331°
267°
November
264°
275°
258°
254°
December
289°
050°
284°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.