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
-1.6
0
2
-3
0
1
February
0.9
4
3
-1
-3
0
March
4.4
8
4
4
8
6
April
10.3
13
10
12
9
May
17.3
17
20
17
15
June
22.1
22
21
24
23
July
24.6
24
25
23
26
August
23.9
22
25
26
24
September
21.1
21
21
21
20
October
14.8
15
15
17
13
November
7.1
8
10
7
11
December
2.7
6
2
4
3
Average
11.3
3.9
13.0
12.5
13.1
12.4
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
-6.4
-4
-2
-11
-4
-4
February
-6.2
-3
-4
-8
-9
-5
March
-3.4
0
-3
-3
-1
-1
April
2.0
3
2
3
1
May
7.7
7
10
7
7
June
13.1
12
12
16
13
July
16.0
16
15
15
17
August
15.8
14
16
17
16
September
12.7
13
13
13
11
October
7.8
9
6
11
6
November
1.1
1
3
1
4
December
-2.1
2
-2
-1
-2
Average
4.1
-3.6
5.7
4.5
5.8
5.1
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
10.5
11
9
11
9
10
February
10.8
10
12
11
10
11
March
10.6
11
11
11
11
9
April
10.0
9
10
9
10
May
8.8
7
9
8
10
June
7.8
8
7
8
7
July
7.2
7
7
8
7
August
7.5
8
8
7
8
September
8.0
7
8
9
9
October
9.8
10
9
9
10
November
11.2
11
12
11
12
December
10.6
9
11
12
11
Average
9.4
10.4
8.8
9.2
8.9
9.5
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
243°
209°
227°
310°
233°
February
246°
216°
229°
245°
265°
March
278°
310°
243°
268°
226°
April
212°
234°
291°
280°
May
320°
181°
283°
346°
June
348°
267°
223°
261°
July
254°
240°
297°
276°
August
300°
255°
242°
278°
September
166°
282°
262°
224°
October
263°
224°
112°
228°
November
248°
218°
240°
234°
December
197°
195°
226°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.