Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
2025
2024
2023
2022
2021
January
95.7
94
96
98
97
98
February
95.0
95
95
96
98
96
March
97.8
99
98
97
95
April
98.3
98
98
99
97
May
97.3
98
95
100
99
June
96.9
100
96
97
95
July
99.7
100
100
100
100
August
96.7
87
100
97
100
September
88.9
52
99
83
99
October
95.5
83
97
98
100
November
95.8
98
97
99
93
December
95.4
96
97
96
95
Average
95.9
94.2
91.8
97.6
96.6
97.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km 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
2025
2024
2023
2022
2021
January
31.2
30.8
31.8
31.6
32.0
30.6
February
30.8
31.1
31.3
30.1
31.3
31.0
March
31.1
32.8
30.8
30.1
30.5
April
30.9
32.5
31.0
31.6
29.8
May
29.3
28.6
29.5
29.3
28.1
June
29.1
32.1
29.6
28.3
27.5
July
30.7
30.3
32.5
32.5
30.3
August
32.4
33.7
34.8
31.5
33.2
September
34.4
35.7
36.2
33.2
35.2
October
33.9
35.2
36.5
32.5
34.2
November
32.2
32.0
34.0
33.2
30.3
December
31.3
32.2
32.5
31.5
31.1
Average
31.4
30.9
32.3
32.4
31.4
31.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
23.7
23.8
24.6
23.1
24.3
23.8
February
24.0
24.1
24.5
23.6
24.0
24.1
March
23.9
25.1
22.1
23.1
23.8
April
23.4
24.5
22.8
22.1
23.3
May
21.5
19.8
21.6
19.6
21.3
June
19.4
20.1
19.3
17.6
18.8
July
18.1
16.0
19.3
19.0
17.1
August
19.0
19.0
21.1
18.3
18.1
September
21.5
21.8
23.3
19.3
22.0
October
23.1
23.8
24.1
22.1
22.5
November
23.2
23.8
23.3
21.6
23.0
December
23.7
23.6
24.5
23.0
24.5
Average
22.2
23.9
22.2
22.3
21.1
21.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.5
16
8
4
3
3
February
7.2
7
12
8
5
4
March
4.3
5
7
6
6
April
2.3
3
3
1
4
May
2.2
2
3
1
2
June
1.6
1
2
3
3
July
0.0
0
0
0
0
August
0.9
1
0
1
0
September
0.8
0
0
2
0
October
1.8
2
1
3
1
November
3.8
5
5
0
6
December
6.5
6
5
6
7
Average
4.0
11.8
3.7
3.1
2.4
2.9
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
2025
2024
2023
2022
2021
January
7.0
6
7
7
7
7
February
6.3
4
6
6
6
5
March
6.1
6
6
6
5
April
5.7
6
5
6
6
May
5.4
5
5
5
5
June
5.2
5
5
6
5
July
5.2
5
6
5
5
August
6.8
6
7
7
7
September
7.2
6
8
9
8
October
7.2
7
9
6
8
November
6.3
6
9
7
5
December
6.2
5
7
6
6
Average
6.1
5.0
5.8
6.5
6.2
6.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
332°
330°
336°
325°
333°
February
340°
338°
339°
324°
327°
March
348°
323°
331°
330°
April
329°
035°
340°
148°
May
185°
173°
140°
139°
June
316°
077°
140°
154°
July
155°
360°
332°
152°
August
315°
342°
147°
149°
September
338°
342°
311°
332°
October
332°
319°
323°
333°
November
337°
327°
340°
334°
December
345°
328°
332°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.