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
77.9
86
83
68
78
91
February
88.2
77
93
87
91
91
March
94.7
95
95
93
94
98
April
92.6
94
92
86
95
92
May
91.5
90
87
99
93
93
June
94.3
93
96
93
94
98
July
97.1
98
96
100
93
99
August
97.5
95
98
100
96
98
September
96.4
99
97
93
98
October
91.4
97
98
90
91
November
86.9
91
90
79
94
December
82.5
76
88
89
86
Average
91.8
91.4
92.4
92.6
91.1
94.3
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
8.5
11
8
7
7
11
February
12.3
13
12
13
13
14
March
14.9
16
16
14
14
15
April
17.5
18
18
16
17
19
May
21.1
20
21
25
19
23
June
26.2
25
27
29
26
24
July
28.8
29
29
32
27
29
August
29.2
29
30
32
27
29
September
25.2
28
25
25
25
October
20.1
24
24
19
17
November
13.6
15
15
10
16
December
10.7
11
11
12
10
Average
19.2
19.8
19.8
20.5
18.0
19.5
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
2.2
4
3
-1
1
4
February
4.1
6
1
4
8
5
March
5.8
7
6
8
5
6
April
7.4
7
7
7
6
11
May
10.9
11
12
13
9
12
June
15.3
15
16
17
15
14
July
16.7
17
17
18
15
17
August
16.7
17
18
19
15
17
September
14.0
17
14
16
14
October
11.0
12
15
9
9
November
6.2
7
8
5
8
December
3.8
4
3
3
5
Average
9.7
10.3
10.0
10.5
8.7
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
24.2
14
28
14
32
20
February
17.2
20
8
23
14
18
March
19.2
15
26
18
15
6
April
14.9
15
26
18
10
12
May
17.5
18
28
2
22
9
June
9.6
13
10
10
6
8
July
6.3
6
7
2
16
2
August
5.9
7
8
1
5
8
September
11.3
5
13
18
17
October
15.8
10
7
8
34
November
23.4
35
27
28
4
December
25.8
30
8
24
41
Average
14.7
13.2
17.4
10.9
15.7
13.7
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
8.4
7
9
5
9
10
February
10.4
9
8
10
16
10
March
11.5
11
9
17
11
12
April
11.0
12
9
10
11
12
May
8.8
8
8
9
9
9
June
8.6
8
9
10
9
8
July
8.2
8
9
8
7
9
August
7.6
7
7
8
6
9
September
8.8
12
10
9
8
October
9.9
9
12
9
10
November
9.4
7
9
7
11
December
8.5
8
7
9
10
Average
9.2
8.9
8.6
9.7
9.1
9.7
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
149°
288°
290°
293°
114°
February
281°
112°
295°
120°
290°
March
125°
289°
122°
290°
122°
April
008°
298°
281°
112°
118°
May
290°
293°
248°
295°
199°
June
301°
134°
104°
120°
302°
July
298°
299°
294°
301°
295°
August
286°
300°
293°
307°
295°
September
116°
299°
123°
283°
October
117°
119°
120°
262°
November
284°
138°
296°
120°
December
286°
126°
286°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.