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
65.0
73
65
77
67
55
February
71.9
53
68
86
83
83
March
78.3
66
71
95
84
86
April
93.0
86
93
92
98
99
May
94.1
93
100
95
88
95
June
96.7
96
96
98
99
97
July
95.7
94
97
97
95
94
August
94.0
97
87
96
94
95
September
89.6
90
91
94
88
89
October
79.3
74
69
81
78
90
November
68.0
71
82
70
69
December
63.7
61
65
60
60
Average
86.3
85.0
84.4
91.1
86.9
87.9
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
3.1
1
5
5
2
6
February
4.0
5
5
5
2
6
March
6.6
7
6
9
8
7
April
11.3
11
11
11
10
13
May
16.7
20
17
15
14
14
June
21.4
20
22
21
23
22
July
21.9
21
20
22
24
19
August
21.5
22
20
24
19
23
September
17.8
20
20
17
17
19
October
12.5
13
12
14
13
13
November
7.2
5
8
7
9
December
3.6
3
0
2
5
Average
12.6
13.8
12.1
12.9
11.8
12.9
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
-2.4
-5
1
-1
-3
2
February
-2.1
0
-2
-1
-6
1
March
-2.7
1
-2
-4
-1
-1
April
0.8
2
1
0
-1
0
May
5.3
8
5
5
4
3
June
10.4
10
10
10
12
11
July
12.0
11
11
12
15
11
August
11.7
11
12
13
11
12
September
9.0
10
11
8
9
8
October
5.5
6
5
8
5
6
November
2.6
1
4
3
5
December
-1.5
-1
-5
-4
2
Average
4.5
5.4
4.1
4.3
3.6
5.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.6
26
27
15
26
27
February
23.2
28
16
20
16
32
March
16.8
15
21
0
12
15
April
9.8
16
7
11
9
6
May
9.6
5
2
15
18
13
June
6.5
8
6
9
3
6
July
9.1
8
13
6
8
14
August
9.3
10
16
5
11
7
September
10.7
8
7
14
10
8
October
15.4
14
31
6
16
13
November
20.6
23
18
24
18
December
24.4
30
29
25
25
Average
12.9
12.2
14.3
10.6
13.1
13.4
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
7.3
8
8
8
7
8
February
7.7
8
7
9
8
9
March
7.7
8
8
6
8
9
April
8.6
8
9
9
9
8
May
7.8
8
8
7
7
8
June
7.2
7
7
6
7
8
July
7.0
7
7
7
7
8
August
6.3
6
6
6
7
6
September
7.1
8
6
7
7
7
October
7.4
8
8
7
7
8
November
6.8
7
7
7
7
December
6.8
8
6
6
7
Average
7.4
7.5
7.4
7.0
7.1
7.6
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
287°
214°
284°
001°
243°
February
239°
283°
250°
027°
245°
March
105°
250°
179°
267°
246°
April
196°
063°
048°
343°
275°
May
096°
139°
234°
180°
264°
June
216°
130°
234°
237°
094°
July
227°
228°
251°
164°
245°
August
216°
219°
182°
249°
184°
September
102°
206°
104°
119°
264°
October
191°
281°
230°
224°
177°
November
066°
122°
288°
236°
December
287°
017°
015°
146°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.