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
79.4
70
86
83
84
February
81.0
83
72
90
86
March
88.9
93
85
90
90
April
93.7
95
90
98
97
May
90.7
95
93
82
93
89
June
91.5
91
95
95
82
July
92.0
93
95
91
88
August
97.2
100
98
93
96
September
93.1
92
96
91
93
October
88.7
94
91
87
80
November
84.1
82
88
84
79
December
62.5
60
68
52
57
Average
87.5
87.4
85.8
89.2
90.4
84.7
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
6.0
5.2
5.2
6.7
7.0
February
7.4
5.5
9.0
7.2
7.7
March
9.7
11.9
11.1
8.8
7.2
April
11.0
13.0
11.5
10.0
7.5
May
15.5
17.3
18.8
14.8
14.9
12.1
June
18.6
16.6
20.5
18.3
19.0
July
20.0
19.3
20.3
20.3
20.1
August
20.2
21.3
21.0
20.0
18.5
September
18.5
17.6
21.0
17.1
18.1
October
14.0
14.0
14.8
14.0
13.4
November
8.9
8.3
9.3
9.5
8.8
December
6.0
7.4
7.4
2.6
5.7
Average
12.8
10.1
13.5
13.6
12.7
14.1
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
2.2
0.9
1.1
3.6
3.5
February
2.6
-1.7
4.7
2.3
3.3
March
2.6
1.1
4.9
3.5
0.8
April
4.4
6.7
3.5
3.7
3.0
May
8.1
7.0
11.1
7.7
8.0
6.9
June
11.3
11.0
11.5
10.9
12.0
July
13.8
13.4
14.0
13.1
14.5
August
13.3
13.8
12.5
13.4
13.5
September
11.4
11.6
12.5
9.9
11.5
October
9.0
8.1
9.6
9.5
8.5
November
5.1
4.7
5.0
5.5
5.4
December
2.3
3.7
3.9
-1.0
1.5
Average
6.7
2.2
7.9
7.5
7.0
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
15.9
23
12
12
11
February
14.9
14
16
8
24
March
7.7
4
6
19
0
April
6.3
8
4
1
18
May
7.0
9
4
4
4
14
June
1.3
1
0
1
5
July
4.6
1
8
4
3
August
2.9
0
5
1
4
September
3.4
0
4
4
5
October
7.9
0
8
3
18
November
16.8
35
13
4
8
December
24.2
28
19
24
29
Average
8.7
11.3
9.7
8.0
5.0
9.8
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
9.9
9
11
10
11
February
10.3
8
11
12
14
March
9.0
8
9
11
7
April
9.3
10
9
9
6
May
8.2
9
7
8
8
8
June
7.3
8
8
6
7
July
7.3
7
8
7
7
August
7.5
8
8
7
8
September
7.1
8
7
7
8
October
8.7
8
9
7
9
November
9.0
10
10
8
7
December
9.9
10
10
9
8
Average
8.3
8.6
8.9
9.0
7.8
7.4
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
217°
236°
223°
274°
February
124°
226°
280°
266°
March
276°
165°
243°
019°
April
235°
048°
020°
027°
May
312°
076°
007°
286°
246°
June
277°
011°
288°
350°
July
269°
235°
289°
296°
August
233°
255°
001°
273°
September
094°
186°
117°
241°
October
098°
228°
181°
195°
November
220°
220°
156°
240°
December
229°
235°
105°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.