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
85.7
84
89
94
85
84
February
92.4
88
93
86
99
86
March
96.7
99
94
94
98
100
April
98.5
100
96
98
99
May
98.3
100
94
100
100
99
June
98.9
98
99
99
99
July
98.9
98
98
100
99
August
98.6
100
95
100
99
September
96.7
96
97
95
97
October
91.5
84
94
91
89
November
80.2
78
92
78
77
December
79.9
79
81
78
82
Average
94.5
94.0
93.2
94.7
95.1
94.1
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
5.6
6.4
5.7
6.9
6.0
4.5
February
8.4
6.7
11.4
8.0
9.6
7.7
March
12.5
14.1
13.8
11.9
13.5
11.6
April
16.2
16.5
14.0
14.8
13.0
May
20.6
21.3
21.3
20.8
23.1
16.6
June
25.9
23.3
27.8
27.1
26.6
July
26.7
26.5
26.1
28.3
24.3
August
26.6
28.0
24.8
29.8
23.0
September
22.0
21.6
25.6
20.1
22.5
October
16.2
15.8
17.8
18.1
14.5
November
9.3
8.5
9.8
11.0
7.7
December
6.1
5.5
7.5
1.5
6.7
Average
15.9
12.2
16.5
16.8
17.4
14.9
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
0.5
0.5
-1.3
2.7
1.1
0.1
February
0.8
-1.7
4.7
1.6
1.9
-2.9
March
2.7
2.5
4.2
3.5
1.7
1.5
April
5.1
5.7
5.0
4.5
2.3
May
9.5
9.3
11.4
10.3
10.5
6.7
June
14.0
12.5
14.8
13.5
15.4
July
14.9
14.5
14.5
14.9
14.5
August
15.3
15.4
15.0
17.6
13.1
September
11.0
12.5
12.9
10.5
11.4
October
7.6
8.8
8.3
8.5
5.4
November
3.6
3.9
4.5
4.2
3.0
December
1.6
1.0
2.9
-3.5
2.0
Average
6.8
3.0
7.8
8.0
7.5
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
22.0
13
14
19
18
41
February
15.4
8
16
11
24
22
March
14.7
5
16
26
6
14
April
12.3
16
15
17
15
May
11.8
5
17
9
6
21
June
7.2
11
3
8
7
July
8.3
11
11
2
11
August
9.2
4
18
6
13
September
10.2
17
4
17
5
October
15.4
11
20
14
16
November
17.4
13
26
13
24
December
22.3
13
19
21
19
Average
12.5
7.2
13.1
14.0
11.0
15.9
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
8.4
8
9
10
8
8
February
8.8
6
9
9
11
7
March
8.8
7
8
10
8
8
April
8.3
9
9
9
8
May
7.8
9
7
9
8
9
June
7.4
7
8
7
6
July
7.1
7
8
7
7
August
6.8
7
7
7
7
September
6.8
8
6
7
6
October
7.1
7
7
6
6
November
7.0
7
10
6
6
December
7.6
8
10
6
7
Average
7.6
7.5
7.5
8.3
7.5
7.1
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
212°
225°
205°
228°
227°
February
071°
205°
248°
219°
053°
March
028°
208°
228°
052°
238°
April
229°
020°
027°
341°
May
343°
160°
023°
279°
223°
June
249°
030°
262°
347°
July
223°
230°
310°
226°
August
225°
229°
032°
236°
September
137°
141°
237°
116°
October
102°
205°
193°
191°
November
190°
206°
197°
202°
December
212°
214°
033°
205°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.