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
68.7
58
86
74
85
74
February
88.8
95
96
91
96
86
March
95.3
92
98
99
98
95
April
96.9
99
95
97
96
May
97.1
97
97
95
100
99
June
96.4
100
99
98
98
99
July
98.8
99
99
100
100
August
97.5
100
97
95
97
September
97.3
94
98
95
98
October
91.7
94
98
86
94
November
79.1
73
94
64
77
December
75.1
71
83
93
61
Average
91.8
90.7
93.8
94.4
93.2
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
5.0
7.2
6.4
8.0
4.9
6.0
February
9.7
7.4
15.1
8.8
11.0
10.5
March
13.9
16.1
16.6
14.5
11.6
11.0
April
18.3
21.3
15.1
16.8
14.5
May
22.5
21.1
23.6
21.8
24.8
21.6
June
28.2
30.8
30.1
25.8
29.3
29.1
July
30.1
32.7
31.3
31.3
31.3
August
30.6
34.2
29.8
30.3
28.0
September
25.1
25.8
28.1
21.8
24.3
October
19.9
19.8
23.1
19.1
16.6
November
11.8
10.0
12.9
11.8
12.0
December
7.0
6.0
9.5
7.5
6.0
Average
18.3
16.6
20.1
19.1
18.7
17.6
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
-3.3
-2.8
-3.5
1.3
-4.7
-1.5
February
-1.3
-3.9
3.2
-2.7
-1.3
-2.9
March
1.8
3.6
5.0
2.5
-2.5
-1.1
April
5.6
7.5
4.7
4.0
3.0
May
11.0
8.9
12.5
11.6
11.5
9.5
June
15.5
15.0
17.0
15.1
16.1
14.1
July
16.8
18.6
17.1
16.5
18.6
August
16.8
18.1
16.8
17.6
15.0
September
12.1
12.6
14.5
12.0
10.8
October
7.5
7.7
9.5
8.6
5.5
November
3.6
0.1
3.2
4.5
3.6
December
0.1
-0.0
0.2
1.5
0.3
Average
7.1
4.9
8.3
8.0
7.4
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
14.2
8
15
17
11
25
February
8.2
5
4
10
5
7
March
8.9
10
8
8
6
14
April
7.7
5
13
7
14
May
6.6
6
8
9
2
9
June
3.2
0
4
5
1
2
July
2.1
3
1
0
2
August
2.6
1
2
4
7
September
4.5
11
1
7
4
October
4.2
6
3
1
4
November
10.6
8
18
8
13
December
13.4
9
6
15
27
Average
6.5
5.2
6.2
7.0
4.8
9.4
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
5.8
5
6
7
6
7
February
6.8
7
7
6
7
6
March
6.8
7
7
7
6
6
April
7.0
7
7
7
6
May
6.4
6
7
7
6
6
June
5.0
5
5
5
5
5
July
5.0
5
5
6
6
August
4.8
5
5
5
4
September
5.7
7
6
5
5
October
5.5
5
6
4
7
November
6.3
5
7
5
7
December
6.2
6
5
7
7
Average
5.9
5.6
5.9
5.8
5.6
5.9
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
170°
272°
158°
251°
175°
February
100°
189°
306°
280°
306°
March
119°
128°
284°
333°
295°
April
189°
336°
281°
264°
May
300°
125°
106°
013°
267°
June
323°
248°
345°
319°
304°
July
354°
289°
288°
333°
August
005°
080°
272°
301°
September
141°
082°
240°
033°
October
118°
177°
062°
085°
November
311°
224°
058°
097°
December
013°
199°
102°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.