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
53.4
67
50
46
45
59
February
71.3
62
68
69
76
77
March
83.7
81
87
91
88
85
April
90.6
91
83
85
90
95
May
90.3
81
91
98
92
98
June
93.0
89
99
95
84
95
July
92.6
92
93
99
84
93
August
93.2
92
90
97
88
99
September
89.2
81
93
88
95
92
October
78.5
83
83
85
75
November
61.8
64
70
51
70
December
49.9
48
40
43
44
Average
82.8
83.2
82.4
84.8
79.9
85.3
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
2.7
3
4
3
2
5
February
5.7
8
6
7
6
6
March
8.8
10
8
10
8
8
April
12.5
13
11
11
9
16
May
16.6
17
17
19
13
16
June
21.5
19
24
23
22
19
July
22.5
22
22
24
20
22
August
22.5
24
21
26
19
24
September
18.2
17
22
17
19
20
October
13.4
15
16
12
11
November
6.9
7
9
5
8
December
4.1
5
0
5
4
Average
13.2
14.7
13.3
14.0
11.6
13.4
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
-1.0
-2
1
-1
-1
1
February
0.3
4
1
1
0
2
March
1.9
4
2
2
1
2
April
4.1
5
3
4
1
6
May
7.9
10
8
9
5
6
June
12.2
11
13
12
14
11
July
13.3
14
13
13
13
12
August
13.6
15
13
15
12
15
September
10.1
11
12
9
11
11
October
7.2
8
9
6
7
November
2.5
3
4
2
3
December
0.5
2
-4
1
1
Average
6.2
7.7
6.6
6.4
5.2
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.4
16
21
16
20
10
February
14.3
20
9
25
9
26
March
12.3
8
18
5
9
15
April
7.8
13
9
9
10
4
May
7.4
12
3
3
10
6
June
3.4
3
0
4
3
5
July
5.4
7
6
1
10
5
August
5.2
3
12
1
6
4
September
6.1
8
2
9
3
3
October
11.2
13
8
6
14
November
12.4
22
5
11
4
December
17.9
20
4
11
17
Average
8.9
9.2
9.8
6.5
8.6
8.4
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
2024
2023
2022
2021
2020
January
9.8
10
11
9
10
10
February
10.5
11
10
13
9
14
March
9.7
9
11
8
9
10
April
8.2
9
8
8
8
8
May
7.3
7
7
7
10
7
June
6.8
7
6
6
6
7
July
7.2
7
9
7
7
8
August
7.0
7
7
6
7
7
September
7.1
8
7
7
6
7
October
9.1
9
8
9
10
November
8.9
11
9
7
9
December
9.7
12
7
8
9
Average
8.2
8.1
8.6
7.8
8.0
8.4
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
247°
245°
259°
257°
223°
February
237°
263°
243°
155°
242°
March
208°
240°
115°
266°
240°
April
247°
259°
360°
333°
173°
May
242°
021°
260°
243°
353°
June
259°
028°
242°
232°
256°
July
242°
247°
306°
262°
271°
August
245°
252°
018°
266°
219°
September
224°
179°
242°
201°
236°
October
222°
197°
203°
223°
November
238°
205°
246°
185°
December
246°
124°
221°
194°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.