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
77.1
95
79
89
75
85
February
72.6
86
78
61
81
72
March
75.9
84
75
90
62
70
April
86.0
83
77
93
97
May
94.3
87
90
94
95
98
June
97.1
96
96
98
98
98
July
98.1
98
100
96
98
August
97.2
94
99
94
99
September
98.2
96
98
99
99
October
92.2
98
72
97
97
November
94.6
100
86
98
95
December
85.8
88
90
95
83
Average
89.1
89.6
89.7
88.1
89.4
91.3
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
32.8
33.7
33.6
33.0
30.8
34.8
February
34.7
36.1
35.2
34.2
33.8
33.7
March
39.9
40.6
42.0
39.2
39.2
39.7
April
42.3
43.8
41.7
42.0
42.1
May
41.4
41.8
42.8
41.2
39.5
41.7
June
37.2
38.2
37.8
35.2
36.7
37.5
July
33.1
32.2
34.5
32.3
33.7
August
31.3
29.8
33.0
30.1
32.7
September
33.0
31.6
33.8
31.8
34.7
October
36.4
34.2
37.3
35.6
38.5
November
36.7
33.8
37.8
35.7
38.7
December
33.5
32.1
34.2
34.3
33.2
Average
36.2
38.1
35.8
36.3
35.1
36.7
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
15.9
16.8
15.5
16.1
15.5
16.8
February
18.3
18.3
19.1
19.1
17.0
17.3
March
23.4
21.1
25.3
22.6
22.6
23.8
April
26.8
28.1
26.0
28.1
23.6
May
28.1
27.6
29.5
27.8
28.1
27.8
June
25.9
26.1
26.1
24.8
27.3
26.0
July
23.9
23.8
24.8
24.3
24.3
August
23.5
23.5
24.0
23.1
23.8
September
23.8
23.8
22.8
23.8
23.8
October
23.1
23.5
23.6
23.1
23.3
November
19.6
18.6
22.3
19.1
20.8
December
17.1
16.3
17.8
17.3
18.3
Average
22.5
22.0
22.8
22.7
22.5
22.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
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
0
June
0.3
0
0
1
0
0
July
0.5
0
1
1
1
August
1.6
6
0
2
0
September
0.7
1
1
1
1
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
0.2
0.0
0.6
0.3
0.3
0.1
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
9.0
9
9
9
10
10
February
9.4
8
9
11
10
10
March
9.6
10
9
10
10
10
April
7.8
7
7
8
8
May
7.0
7
7
6
7
7
June
7.2
7
8
6
8
7
July
7.5
8
7
9
8
August
6.6
7
6
7
6
September
5.8
5
6
6
6
October
6.4
6
7
7
6
November
8.5
8
9
8
8
December
8.6
8
8
9
10
Average
7.8
8.1
7.5
7.4
8.2
8.0
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
038°
036°
031°
001°
013°
February
028°
028°
035°
006°
006°
March
050°
048°
046°
013°
011°
April
071°
346°
346°
031°
May
247°
204°
211°
164°
113°
June
232°
218°
212°
169°
178°
July
242°
223°
208°
208°
August
238°
228°
212°
184°
September
209°
207°
196°
198°
October
090°
056°
022°
034°
November
035°
047°
357°
025°
December
028°
030°
044°
007°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.