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
72.3
85
84
67
68
63
February
83.1
76
86
93
84
90
March
89.5
85
89
96
92
90
April
92.4
96
90
96
95
95
May
90.9
85
85
96
95
99
June
92.9
93
97
93
83
98
July
96.0
97
94
98
94
94
August
93.7
92
94
96
94
95
September
92.2
93
92
92
88
October
91.1
90
92
85
92
November
78.7
84
77
79
78
December
73.6
78
74
65
71
Average
89.0
89.4
89.5
91.2
87.3
89.8
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
6.7
7
8
7
6
8
February
9.4
11
9
11
8
10
March
12.0
13
11
14
12
11
April
15.2
15
13
15
12
19
May
19.2
19
19
21
17
20
June
23.2
21
26
23
23
22
July
24.6
24
24
26
23
23
August
24.6
25
24
27
22
27
September
21.2
24
20
22
22
October
16.7
18
19
16
15
November
10.7
11
12
10
12
December
7.9
9
4
8
8
Average
16.1
16.9
16.3
16.9
14.8
16.5
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
1.7
1
3
2
1
3
February
3.0
6
3
4
2
5
March
4.4
6
5
4
4
4
April
5.9
8
5
6
3
7
May
9.5
11
9
10
8
9
June
13.1
11
15
13
14
13
July
14.4
14
14
14
15
13
August
14.7
15
14
16
14
16
September
11.8
14
11
13
12
October
9.3
10
11
8
9
November
5.0
6
6
4
6
December
3.3
6
-1
4
4
Average
8.1
9.1
8.7
8.2
7.3
8.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
32.3
33
38
27
47
28
February
30.9
53
11
40
21
50
March
27.8
37
40
9
22
28
April
19.5
42
23
17
14
7
May
20.5
36
16
15
39
5
June
16.6
28
6
20
26
22
July
17.6
21
24
3
28
22
August
20.0
15
18
9
42
24
September
21.1
13
31
8
17
October
25.9
32
15
32
48
November
33.8
53
33
39
20
December
36.1
43
15
35
40
Average
23.8
31.7
24.3
17.9
29.0
23.8
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
2024
2023
2022
2021
2020
January
9.7
11
12
8
9
10
February
11.6
12
9
14
11
16
March
10.7
10
12
8
11
12
April
9.3
12
9
10
9
8
May
8.5
8
9
8
11
9
June
7.8
8
8
7
7
8
July
8.3
7
10
7
8
9
August
8.0
8
9
8
9
8
September
8.2
7
8
7
8
October
9.6
9
8
9
12
November
9.4
12
10
8
9
December
10.3
13
7
9
10
Average
9.1
8.9
9.7
8.6
8.8
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
225°
219°
234°
223°
202°
February
207°
269°
227°
142°
220°
March
192°
223°
086°
257°
339°
April
234°
346°
011°
356°
060°
May
255°
009°
272°
226°
001°
June
273°
019°
260°
328°
234°
July
246°
234°
297°
265°
255°
August
229°
258°
014°
275°
226°
September
178°
252°
134°
272°
October
202°
195°
198°
199°
November
212°
184°
252°
187°
December
218°
111°
211°
188°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.