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
76.4
87
64
77
87
85
February
67.3
59
74
82
61
March
75.6
64
92
69
46
April
89.9
89
90
97
96
May
98.2
99
99
99
95
June
98.9
99
97
99
99
July
98.1
98
98
100
97
August
97.6
98
98
98
97
September
98.3
98
99
98
99
October
94.9
94
92
94
100
November
87.6
80
88
93
96
December
82.5
89
71
83
91
Average
88.8
86.6
84.9
90.2
92.3
89.2
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
33.3
33.7
34.6
33.2
31.8
35.3
February
35.6
36.2
35.7
35.6
35.8
March
39.0
40.5
39.1
38.5
38.5
April
39.7
40.7
39.6
38.7
40.6
May
37.9
38.2
38.7
37.6
38.5
June
34.6
36.0
35.3
33.6
34.3
July
32.0
32.2
32.8
32.2
31.5
August
30.6
30.0
31.3
30.6
30.5
September
32.1
31.1
33.6
30.1
33.2
October
34.9
33.6
36.1
34.7
36.6
November
36.3
34.8
37.2
35.5
37.2
December
33.8
33.2
33.8
34.2
34.2
Average
34.8
33.7
35.1
35.5
34.4
35.5
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
17.9
19.3
17.8
17.6
17.6
18.5
February
20.8
20.6
21.6
20.3
20.8
March
25.7
27.0
25.5
26.3
26.3
April
28.0
29.3
27.3
27.1
27.5
May
27.4
28.1
27.3
27.0
27.5
June
25.1
26.3
24.8
24.6
24.3
July
23.9
24.6
24.0
24.1
24.1
August
23.0
23.8
23.1
22.8
22.8
September
23.6
24.3
23.8
22.3
23.5
October
24.1
24.3
25.1
23.3
24.6
November
21.2
19.8
23.3
19.8
22.0
December
18.5
17.5
18.1
19.8
18.6
Average
22.8
19.3
23.6
23.5
23.0
23.4
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
0.1
0
0
0
0
March
0.1
0
0
0
0
April
0.1
0
0
0
0
May
0.5
1
0
1
0
June
0.4
0
0
2
0
July
3.3
7
1
3
5
August
5.4
3
3
6
4
September
2.6
6
2
2
3
October
0.3
2
0
0
1
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
1.0
1.3
0.4
1.3
1.0
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
7.9
8
8
7
10
8
February
8.1
8
9
8
8
March
6.9
6
7
7
7
April
6.5
7
6
7
7
May
7.0
7
7
7
7
June
6.9
8
7
6
7
July
6.6
7
6
7
7
August
6.2
8
6
6
6
September
5.5
6
6
5
6
October
5.3
6
5
6
5
November
6.6
8
6
7
6
December
7.8
9
8
8
9
Average
6.9
7.9
7.3
6.7
6.8
6.9
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
051°
059°
057°
051°
059°
February
053°
071°
060°
066°
March
054°
083°
050°
058°
April
300°
307°
234°
135°
May
211°
216°
213°
220°
June
207°
213°
226°
209°
July
220°
200°
221°
215°
August
224°
194°
228°
213°
September
193°
197°
185°
192°
October
176°
178°
119°
208°
November
071°
063°
066°
053°
December
061°
055°
068°
065°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.