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
83.6
88
95
60
80
90
February
89.1
90
85
94
93
89
March
95.4
94
100
92
95
98
April
94.8
97
99
82
95
May
91.7
85
99
94
71
93
June
95.3
96
98
96
82
98
July
96.7
99
100
82
99
August
96.4
100
99
80
95
September
98.2
98
99
97
99
October
92.7
93
93
93
97
November
87.3
91
87
86
96
December
77.5
80
83
70
92
Average
92.0
90.7
95.1
91.6
84.4
95.2
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
17.1
17.6
19.6
15.6
15.9
19.0
February
18.8
16.3
19.3
18.6
20.8
20.6
March
23.7
24.0
23.8
24.3
22.0
24.5
April
30.3
33.2
29.1
31.5
32.8
May
36.9
38.8
35.3
35.6
34.8
39.7
June
42.5
42.7
44.8
40.6
42.7
42.2
July
45.1
44.7
45.7
44.2
45.8
August
44.8
44.8
45.7
45.0
45.2
September
41.4
40.1
41.8
41.2
39.6
October
33.8
32.3
33.3
35.2
34.1
November
24.3
23.1
25.3
24.8
25.8
December
18.8
18.3
20.3
19.8
18.6
Average
31.1
28.0
31.6
30.9
31.9
32.4
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
5.6
5.5
7.5
6.5
3.7
5.0
February
6.9
4.2
8.1
6.0
7.5
8.0
March
11.7
12.5
11.4
13.0
9.4
11.5
April
16.3
17.8
15.8
16.5
17.0
May
21.9
23.6
22.1
21.3
20.6
23.1
June
26.2
26.5
28.5
25.5
26.1
25.1
July
28.7
29.8
28.1
27.8
29.1
August
28.2
29.1
29.1
28.5
27.3
September
24.5
25.1
24.1
24.5
23.6
October
18.8
16.8
20.1
19.1
18.3
November
12.5
12.1
13.1
12.9
11.9
December
7.8
5.5
9.0
9.9
6.7
Average
17.1
14.6
17.8
17.3
17.5
17.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.6
5
0
7
1
1
February
3.7
4
7
0
1
3
March
3.0
5
4
1
1
1
April
2.2
2
2
1
0
May
0.6
0
0
0
1
0
June
0.0
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
0.8
0
2
1
1
November
3.1
3
3
4
0
December
1.9
1
3
1
1
Average
1.4
2.3
1.3
1.4
0.8
0.5
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
7.2
7
7
7
7
7
February
7.4
7
7
8
8
7
March
8.7
8
8
8
9
9
April
8.6
9
8
9
9
May
8.8
10
8
9
10
8
June
10.0
10
9
8
9
12
July
10.9
11
9
12
9
August
10.1
10
8
11
8
September
8.2
9
7
8
10
October
6.8
7
5
7
7
November
6.5
7
7
6
7
December
7.0
7
6
7
8
Average
8.5
8.4
8.3
7.5
8.9
8.6
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
317°
262°
297°
243°
260°
February
312°
300°
321°
289°
312°
March
344°
322°
186°
269°
263°
April
347°
322°
296°
307°
May
317°
316°
322°
293°
288°
June
307°
307°
316°
302°
297°
July
306°
304°
292°
298°
August
305°
303°
301°
287°
September
314°
318°
296°
301°
October
318°
328°
323°
320°
November
335°
249°
314°
310°
December
315°
315°
291°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.