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
87.2
88
95
94
90
75
February
90.6
91
91
93
100
85
March
91.4
97
92
89
83
89
April
93.1
98
96
99
95
May
95.5
99
89
94
98
95
June
95.1
100
98
96
87
July
98.3
97
99
100
97
August
97.6
99
97
98
100
September
95.3
91
97
98
93
October
94.2
94
94
99
95
November
90.5
89
93
85
96
December
84.4
77
84
89
82
Average
93.7
94.5
93.4
94.6
95.4
91.5
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
7.6
6.7
7.5
8.5
7.9
6.2
February
9.5
7.5
11.5
10.3
11.9
8.1
March
11.1
12.0
11.8
10.5
11.5
10.8
April
13.5
14.0
12.6
13.8
10.9
May
17.4
18.3
17.8
16.3
18.1
14.8
June
21.0
19.8
22.3
21.1
21.0
July
23.1
22.3
22.1
25.1
22.1
August
23.2
24.1
23.8
25.3
20.8
September
20.0
19.6
22.8
19.6
21.0
October
16.0
15.6
17.3
17.5
16.1
November
11.1
11.0
11.0
12.5
10.9
December
8.8
9.0
9.8
5.7
9.5
Average
14.8
11.2
15.4
15.7
16.2
14.4
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
2.1
1.8
3.2
2.0
1.8
1.3
February
3.3
2.7
6.5
2.7
4.2
2.7
March
4.2
2.6
6.4
4.7
3.7
2.7
April
5.0
7.2
5.5
4.5
1.6
May
8.5
8.6
10.3
9.6
9.0
7.0
June
12.1
12.3
14.5
10.5
12.1
July
14.0
15.0
15.0
13.5
13.8
August
13.2
15.0
9.8
14.0
12.9
September
11.3
12.0
13.5
11.3
12.1
October
8.8
9.5
10.0
9.5
8.5
November
5.2
6.0
5.4
6.7
5.2
December
4.0
5.7
5.9
-1.8
4.9
Average
7.3
4.0
9.1
8.3
7.6
7.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
8.6
10
7
9
3
18
February
10.3
10
9
1
9
16
March
8.4
0
11
18
5
6
April
5.0
7
10
2
0
May
4.5
2
11
2
7
8
June
4.0
1
2
2
8
July
4.7
5
8
0
6
August
4.5
3
4
2
2
September
4.7
4
2
4
3
October
8.8
6
10
4
7
November
9.0
6
12
19
6
December
10.9
9
17
4
9
Average
6.3
4.5
6.4
7.2
4.6
6.8
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
9.4
9
11
10
8
9
February
11.0
9
11
8
15
10
March
10.3
7
11
11
9
10
April
9.3
12
9
10
8
May
8.4
9
8
8
8
10
June
8.8
9
9
9
7
July
9.0
9
11
9
8
August
9.1
10
9
8
9
September
9.0
9
8
8
8
October
9.6
8
9
10
10
November
9.0
8
10
10
8
December
9.9
11
11
7
9
Average
9.2
8.5
9.6
9.4
9.1
8.7
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
226°
246°
246°
258°
255°
February
150°
226°
269°
237°
161°
March
068°
186°
228°
093°
256°
April
240°
098°
045°
033°
May
025°
198°
040°
230°
225°
June
240°
085°
195°
037°
July
220°
233°
211°
192°
August
220°
232°
109°
246°
September
245°
188°
265°
197°
October
191°
220°
209°
220°
November
235°
250°
212°
276°
December
251°
232°
350°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.