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
2024
2023
2022
2021
2020
January
62.9
71
59
54
65
53
February
75.2
65
76
69
77
81
March
87.7
85
86
92
93
90
April
94.6
94
94
93
93
98
May
93.2
81
95
99
93
100
June
95.7
93
98
96
93
97
July
94.4
94
92
99
84
99
August
93.2
91
86
98
92
99
September
91.0
88
88
90
94
October
78.7
78
72
82
80
November
67.1
65
72
57
69
December
56.3
52
59
44
50
Average
82.7
85.6
82.9
85.9
83.3
87.7
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
2024
2023
2022
2021
2020
January
3.9
4
5
4
3
6
February
6.9
9
7
8
7
8
March
10.1
12
10
12
10
10
April
14.2
14
12
13
11
18
May
18.0
19
19
21
14
18
June
23.0
21
25
24
24
21
July
23.9
23
24
26
21
24
August
24.1
25
23
27
20
26
September
20.2
23
18
20
22
October
14.4
16
17
14
13
November
8.0
8
10
7
10
December
5.0
6
1
5
5
Average
13.9
16.0
14.8
15.5
13.0
14.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-1.9
-2
1
0
-1
1
February
0.7
4
1
1
1
2
March
1.9
5
2
1
1
2
April
4.3
5
4
4
1
5
May
8.1
10
8
9
6
7
June
12.3
11
13
12
13
12
July
13.4
14
13
13
13
12
August
13.8
15
13
15
12
15
September
9.9
12
9
10
10
October
6.5
8
8
4
8
November
2.7
4
4
2
3
December
1.0
3
-3
1
2
Average
6.2
7.8
6.8
6.4
5.2
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
22.1
24
30
20
23
11
February
16.9
21
9
28
15
23
March
15.3
16
22
11
9
16
April
11.8
18
18
13
11
3
May
9.7
20
9
7
12
5
June
6.6
10
2
12
6
7
July
8.2
14
15
2
13
4
August
7.6
7
17
3
7
4
September
6.5
4
13
2
6
October
13.9
21
11
12
17
November
17.7
34
14
12
4
December
22.6
30
15
12
28
Average
12.7
15.7
16.7
11.4
10.5
9.2
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
2024
2023
2022
2021
2020
January
8.0
9
10
7
5
8
February
9.1
10
8
12
6
12
March
8.6
8
10
7
8
9
April
8.0
9
8
9
7
7
May
6.9
6
7
7
9
6
June
6.3
7
7
6
5
7
July
6.3
6
9
6
6
6
August
6.2
6
7
6
7
4
September
5.5
6
6
5
3
October
7.1
8
6
7
7
November
7.0
10
7
5
4
December
7.3
10
5
5
5
Average
7.1
7.3
8.3
6.9
6.4
6.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
245°
231°
248°
228°
206°
February
229°
273°
239°
093°
219°
March
225°
242°
085°
236°
125°
April
248°
276°
051°
355°
080°
May
237°
038°
261°
213°
032°
June
251°
057°
242°
147°
213°
July
241°
243°
302°
185°
233°
August
239°
246°
059°
190°
224°
September
202°
249°
124°
226°
October
224°
220°
210°
213°
November
230°
220°
235°
206°
December
239°
056°
220°
204°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.