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
2.7
2
5
2
2
3
February
2.6
2
3
3
2
4
March
4.2
6
4
5
6
5
April
7.9
9
8
8
7
May
11.7
12
12
12
11
June
15.7
15
16
18
16
July
19.1
19
20
18
23
August
19.4
19
20
20
20
September
16.7
16
17
18
17
October
14.0
15
15
14
14
November
9.1
7
11
10
10
December
4.9
6
6
6
7
Average
9.8
3.3
10.8
11.5
11.1
11.3
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
-3.1
-3
0
-6
-1
-2
February
-4.8
-2
-4
-4
-3
-2
March
-1.2
1
0
0
-1
0
April
2.9
4
4
4
2
May
6.2
7
7
7
6
June
9.7
9
10
11
10
July
12.2
13
14
13
11
August
13.2
13
14
14
12
September
12.1
12
12
13
12
October
9.5
10
10
10
9
November
3.9
2
5
6
5
December
-1.7
1
1
0
2
Average
4.4
-2.5
5.6
5.9
6.0
5.3
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
16.0
16
16
18
15
15
February
15.4
16
16
15
15
14
March
16.2
16
17
15
16
16
April
12.6
10
14
14
14
May
10.5
11
10
10
13
June
9.4
10
8
10
9
July
8.1
8
9
9
8
August
7.9
8
8
7
9
September
9.5
8
10
9
11
October
11.5
10
9
11
12
November
15.3
14
15
15
13
December
16.3
14
19
18
17
Average
12.4
16.2
11.2
11.7
12.0
12.1
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
321°
347°
317°
341°
311°
February
317°
321°
304°
302°
272°
March
328°
341°
261°
268°
327°
April
294°
311°
332°
325°
May
234°
116°
181°
223°
June
079°
173°
173°
167°
July
148°
172°
158°
168°
August
174°
152°
151°
196°
September
050°
277°
183°
160°
October
275°
115°
002°
282°
November
289°
268°
291°
209°
December
336°
355°
290°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.