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
98.1
99
98
100
99
97
February
98.7
96
99
100
100
March
96.9
97
96
98
100
April
94.0
86
97
95
100
May
87.5
69
84
90
97
June
85.4
85
84
81
84
July
82.4
82
85
69
88
August
84.8
77
99
88
77
September
80.0
67
66
94
89
October
90.8
94
89
89
95
November
96.3
96
85
97
99
December
96.7
98
92
99
95
Average
92.2
98.5
87.6
89.8
91.1
93.3
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
30.3
29.8
28.6
32.7
31.5
29.6
February
30.0
30.0
31.5
30.3
28.1
March
28.6
28.3
31.6
28.6
27.1
April
25.8
24.6
25.8
25.6
25.5
May
21.6
18.6
23.6
20.6
20.8
June
19.6
20.5
21.0
17.0
18.1
July
18.5
16.8
19.0
19.3
18.3
August
19.8
18.0
22.5
19.8
19.1
September
21.2
20.1
20.6
20.8
20.6
October
23.8
23.5
23.8
23.8
23.6
November
26.4
25.1
26.6
27.5
26.3
December
28.1
25.5
28.1
30.1
27.3
Average
25.1
29.8
23.2
25.5
24.4
23.7
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
23.0
21.8
22.5
22.8
25.6
24.6
February
21.9
22.1
21.8
21.6
23.3
March
20.8
20.1
23.1
19.8
22.5
April
18.1
18.1
16.6
16.1
20.1
May
13.8
13.0
14.3
11.3
12.5
June
11.4
13.6
10.8
7.5
12.3
July
10.3
8.9
10.4
10.3
11.5
August
11.7
11.5
11.1
10.0
14.6
September
15.1
14.4
13.9
12.0
17.5
October
17.2
17.5
15.4
15.0
19.5
November
19.5
19.5
18.1
17.8
21.6
December
21.4
19.3
20.6
21.3
22.8
Average
17.5
21.9
16.7
16.5
15.5
18.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.6
3
2
2
2
4
February
3.3
6
2
3
6
March
4.7
4
8
3
5
April
5.3
17
1
5
2
May
10.9
30
16
11
4
June
7.2
8
6
8
9
July
9.0
4
13
9
7
August
7.8
10
2
6
12
September
11.5
7
19
8
9
October
7.6
6
2
12
8
November
4.9
7
11
3
3
December
4.5
4
9
4
8
Average
6.1
3.2
8.3
7.5
6.2
6.3
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
9.3
9
10
10
10
10
February
8.7
9
9
9
9
March
8.4
7
8
9
9
April
8.2
9
8
8
10
May
7.3
8
7
7
8
June
6.8
7
7
7
9
July
7.1
6
8
7
8
August
8.0
8
8
8
8
September
9.3
10
9
10
10
October
10.0
11
10
10
11
November
10.2
10
9
11
11
December
10.4
11
10
10
12
Average
8.8
9.3
8.9
8.6
8.7
9.7
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
122°
109°
110°
107°
110°
February
098°
132°
107°
135°
March
114°
102°
184°
157°
April
112°
158°
112°
093°
May
192°
190°
233°
261°
June
270°
251°
244°
243°
July
210°
155°
067°
316°
August
151°
208°
139°
089°
September
084°
125°
156°
108°
October
107°
125°
152°
113°
November
101°
095°
101°
119°
December
146°
123°
130°
110°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.