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
71.9
72
81
58
71
79
February
84.3
80
84
90
84
88
March
91.0
93
93
93
94
86
April
95.4
95
94
92
98
95
May
93.7
87
95
98
96
93
June
94.5
93
95
95
94
95
July
96.9
95
96
99
96
98
August
95.6
91
95
97
97
96
September
93.8
97
96
93
95
October
86.1
93
87
89
88
November
81.3
83
84
82
91
December
69.0
70
71
65
79
Average
89.6
89.3
90.9
90.5
89.7
91.0
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
8.1
9
8
7
7
10
February
11.0
12
11
12
11
12
March
13.7
14
14
15
14
13
April
17.0
17
16
16
16
20
May
20.3
19
21
23
18
22
June
24.8
23
27
26
24
22
July
27.0
27
26
29
24
27
August
26.9
27
27
29
24
28
September
24.1
27
23
24
25
October
18.8
21
21
18
16
November
12.3
13
14
10
15
December
9.1
10
6
9
9
Average
17.9
18.3
18.4
18.9
16.6
18.1
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
2.3
3
3
2
1
4
February
3.1
6
2
3
4
5
March
4.5
5
5
5
3
5
April
6.1
7
6
6
4
9
May
9.3
10
10
11
8
10
June
13.6
13
15
14
14
12
July
14.8
15
14
15
14
14
August
14.5
15
15
17
13
15
September
12.0
15
11
13
12
October
9.5
10
12
7
9
November
4.8
7
6
3
6
December
3.5
6
0
4
4
Average
8.3
9.0
8.8
8.7
7.2
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
30.0
26
39
20
33
32
February
27.3
37
12
31
25
43
March
27.5
35
28
21
13
32
April
17.9
29
24
24
5
8
May
22.4
48
18
6
33
8
June
18.6
21
11
19
25
33
July
10.8
11
15
5
19
3
August
13.0
11
22
6
19
17
September
17.6
16
34
22
10
October
27.2
31
22
23
45
November
33.3
46
42
29
12
December
33.9
36
10
37
47
Average
22.0
26.6
23.4
18.8
22.9
22.5
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
8.9
9
10
7
9
10
February
9.5
10
7
9
10
13
March
9.5
9
11
8
9
10
April
8.3
9
9
9
9
7
May
8.1
8
9
7
10
9
June
7.2
8
7
7
6
9
July
7.6
7
9
7
8
8
August
7.2
7
8
7
8
8
September
7.4
7
8
7
7
October
8.6
9
8
9
10
November
8.4
11
9
7
7
December
9.5
10
8
10
11
Average
8.2
8.1
8.7
7.8
8.4
8.8
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
212°
236°
342°
250°
199°
February
219°
033°
230°
178°
230°
March
216°
230°
127°
312°
343°
April
253°
301°
327°
038°
183°
May
236°
010°
347°
234°
037°
June
297°
356°
248°
231°
229°
July
258°
244°
029°
249°
311°
August
260°
264°
006°
292°
244°
September
207°
267°
203°
291°
October
201°
197°
197°
227°
November
229°
211°
334°
182°
December
222°
058°
217°
219°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.