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
88.0
90
95
91
95
78
February
91.6
94
92
93
92
92
March
90.9
86
94
91
90
92
April
91.0
86
94
95
92
May
91.4
95
93
86
98
99
June
95.4
97
100
95
98
95
July
97.0
97
99
94
98
August
92.3
85
99
91
84
September
82.9
46
98
87
91
October
87.8
66
78
96
96
November
91.6
97
78
97
92
December
90.5
91
97
95
89
Average
90.9
92.1
86.5
91.3
93.8
91.2
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
31.6
31.6
33.6
30.8
33.5
29.3
February
31.2
32.7
32.6
30.1
32.1
31.1
March
30.8
29.6
33.0
31.1
30.3
30.3
April
29.4
30.3
28.6
29.8
27.6
May
26.5
28.1
24.6
26.1
26.8
25.6
June
25.4
23.8
27.8
26.6
26.0
23.6
July
26.6
25.3
26.8
29.3
26.8
August
28.9
29.3
31.3
27.8
29.6
September
31.7
33.2
32.8
28.8
32.3
October
32.3
32.8
34.2
30.5
32.5
November
32.3
32.1
34.6
33.7
30.8
December
31.4
31.0
34.0
32.3
31.5
Average
29.7
29.2
30.4
30.6
30.0
29.3
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
22.1
22.8
24.3
21.1
23.3
20.5
February
21.9
22.8
23.1
19.5
22.5
22.1
March
21.2
21.5
23.8
22.0
19.6
21.1
April
20.6
22.6
19.5
21.1
20.8
May
17.9
19.5
16.8
18.3
16.6
17.8
June
16.4
16.1
19.3
17.1
15.4
15.5
July
16.5
15.0
18.6
18.6
15.5
August
17.5
17.8
20.1
17.0
18.6
September
20.2
21.1
22.1
18.8
21.8
October
21.3
22.5
23.1
20.3
21.1
November
21.6
22.6
24.3
20.3
21.3
December
22.2
21.6
23.8
22.3
22.8
Average
20.0
20.5
20.8
20.8
19.5
19.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.4
8
2
8
1
15
February
6.4
4
8
9
2
5
March
5.3
7
1
7
7
4
April
4.4
8
4
1
5
May
5.1
2
6
8
3
1
June
4.0
4
0
4
1
4
July
2.5
6
1
5
2
August
2.8
3
0
6
1
September
1.4
1
0
2
1
October
3.0
3
3
2
3
November
3.3
3
1
1
7
December
7.3
8
4
3
9
Average
4.4
5.1
4.1
4.2
2.6
4.8
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
10.0
9
10
10
10
11
February
9.8
10
10
11
10
8
March
9.4
8
12
10
10
8
April
9.7
11
9
11
9
May
10.6
11
13
9
10
11
June
11.7
12
14
11
11
10
July
12.0
12
12
14
11
August
12.5
13
12
12
13
September
12.4
13
14
12
13
October
11.5
10
13
10
11
November
10.4
10
15
11
10
December
10.3
10
13
11
8
Average
10.8
9.8
11.2
11.6
11.0
10.2
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
333°
336°
339°
340°
337°
February
341°
338°
330°
332°
321°
March
347°
333°
333°
345°
312°
April
341°
177°
336°
308°
May
337°
288°
337°
245°
321°
June
276°
333°
339°
286°
217°
July
195°
334°
339°
330°
August
312°
333°
306°
284°
September
328°
334°
214°
332°
October
321°
336°
324°
330°
November
328°
336°
228°
330°
December
322°
333°
316°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.