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
80.5
80
90
89
89
68
February
82.2
87
73
85
96
80
March
87.1
92
88
81
85
91
April
92.4
93
92
97
98
May
93.3
90
92
97
96
June
94.0
99
93
96
85
July
94.0
91
95
100
91
August
94.3
92
96
97
94
September
93.3
91
96
96
88
October
87.5
86
91
98
89
November
83.6
80
92
84
91
December
77.8
71
79
79
67
Average
89.3
87.2
88.3
90.8
94.2
87.8
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
7.8
6.9
8.0
8.3
8.3
6.5
February
9.4
7.9
11.1
9.9
10.6
8.1
March
11.4
13.0
11.6
10.1
12.4
11.0
April
14.2
13.5
13.3
14.5
11.8
May
17.8
18.0
17.5
18.1
15.0
June
21.2
19.8
23.6
20.6
21.1
July
22.8
21.6
20.8
25.0
22.3
August
22.3
22.8
21.3
25.3
20.1
September
19.8
18.6
23.0
19.1
20.8
October
15.7
15.5
16.8
17.1
15.9
November
11.2
10.8
11.0
12.9
10.6
December
9.0
9.5
10.0
5.5
9.5
Average
14.6
9.3
15.1
15.5
16.1
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
1.7
0.7
1.8
2.5
1.5
1.1
February
3.0
2.1
5.9
2.3
4.0
2.7
March
4.0
2.5
5.2
5.0
3.7
2.5
April
5.0
6.7
4.5
5.0
1.3
May
8.2
10.0
8.1
9.0
6.2
June
11.7
10.3
12.5
10.8
12.5
July
13.6
13.0
13.1
13.8
14.0
August
13.4
13.5
13.4
14.5
12.8
September
10.9
11.0
13.1
11.0
11.9
October
8.4
8.5
9.4
9.0
8.5
November
4.8
5.0
4.5
6.5
4.4
December
3.8
5.2
5.7
-1.6
5.4
Average
6.8
1.7
8.0
7.9
7.6
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
15.6
19
11
15
6
29
February
17.3
17
25
4
14
24
March
12.9
2
17
27
10
10
April
7.4
10
14
5
3
May
7.3
11
4
7
14
June
6.9
4
2
5
14
July
7.8
9
12
2
11
August
7.8
7
7
5
8
September
8.1
12
5
8
8
October
13.6
13
12
8
12
November
14.3
9
22
22
6
December
16.7
13
25
9
16
Average
10.6
11.5
10.8
11.3
7.5
11.9
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
7
9
9
6
8
February
9.2
8
9
7
12
9
March
9.1
7
8
10
8
9
April
8.2
10
8
9
8
May
7.6
7
9
7
9
June
7.5
7
8
7
6
July
7.3
7
9
7
7
August
7.4
8
8
7
8
September
7.4
8
7
7
7
October
7.5
6
7
7
8
November
7.5
7
9
8
7
December
8.2
9
10
6
8
Average
7.8
7.3
7.9
8.1
7.6
7.6
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
232°
261°
248°
263°
273°
February
122°
233°
280°
240°
146°
March
049°
197°
234°
085°
261°
April
251°
056°
028°
035°
May
243°
033°
234°
230°
June
265°
059°
208°
358°
July
235°
233°
241°
232°
August
228°
241°
076°
260°
September
307°
193°
294°
197°
October
188°
215°
209°
228°
November
261°
256°
216°
291°
December
265°
235°
019°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.