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
82.0
76
87
87
82
81
February
82.8
91
68
82
80
93
March
86.4
90
89
90
91
94
April
90.7
92
84
93
100
May
87.7
87
90
91
93
June
86.7
97
83
95
77
July
86.8
85
86
94
80
August
87.1
87
83
86
87
September
89.0
84
96
91
90
October
86.1
86
88
88
89
November
87.8
67
88
96
95
December
81.6
73
89
95
73
Average
86.5
86.3
84.8
86.9
90.3
87.5
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
8.9
8.5
8.5
9.3
9.4
8.3
February
9.4
8.8
10.9
9.3
10.1
8.6
March
10.6
11.1
11.0
10.5
11.5
10.5
April
12.6
12.6
12.0
12.6
10.8
May
15.3
15.8
15.0
16.3
13.6
June
18.2
17.6
19.5
18.6
17.5
July
20.1
19.1
19.3
22.3
19.5
August
19.9
20.0
19.3
22.1
18.3
September
18.4
17.0
21.0
18.6
19.3
October
15.6
15.5
16.8
16.8
16.0
November
12.1
12.5
12.1
13.4
11.5
December
10.2
10.3
11.1
7.7
10.6
Average
13.8
9.5
14.2
14.6
15.2
13.7
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
5.6
4.5
4.9
6.2
6.0
5.0
February
6.0
5.5
8.1
6.0
6.7
5.2
March
6.7
6.7
7.0
7.0
7.0
5.9
April
7.5
8.1
7.4
7.2
5.0
May
9.9
10.5
10.1
10.3
8.4
June
12.6
12.0
13.5
12.5
12.1
July
14.4
14.4
14.1
15.0
14.4
August
14.8
14.9
14.8
16.1
14.1
September
13.8
13.4
15.4
13.9
14.1
October
11.8
12.0
12.5
13.1
11.6
November
8.9
9.0
8.8
10.0
8.8
December
7.3
7.5
8.5
4.2
7.5
Average
9.5
5.5
10.2
10.4
10.4
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
19.6
19
14
21
16
28
February
17.6
14
31
12
19
14
March
13.7
5
12
18
11
9
April
9.8
13
16
8
3
May
7.4
9
6
4
15
June
8.9
5
4
7
13
July
7.6
13
12
2
10
August
8.2
9
12
7
7
September
9.0
12
5
11
4
October
14.7
10
13
10
10
November
16.3
16
25
16
13
December
20.4
21
18
17
16
Average
11.8
12.1
12.7
12.3
9.2
11.1
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
12.2
12
12
13
10
12
February
13.4
11
14
10
16
13
March
12.1
10
12
13
11
11
April
10.2
12
11
11
10
May
9.9
9
10
9
13
June
9.5
10
10
10
7
July
9.7
9
12
9
10
August
10.0
10
11
9
10
September
10.5
11
9
10
9
October
11.7
10
12
12
12
November
12.7
11
15
15
10
December
13.8
13
16
9
15
Average
11.0
10.9
10.8
11.4
10.6
10.6
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
200°
205°
261°
258°
265°
February
140°
242°
351°
248°
146°
March
081°
210°
226°
102°
258°
April
241°
260°
036°
042°
May
245°
027°
274°
244°
June
297°
024°
264°
345°
July
259°
243°
293°
254°
August
253°
261°
001°
266°
September
288°
209°
274°
278°
October
188°
214°
197°
233°
November
142°
266°
231°
321°
December
277°
246°
101°
232°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.