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
66.9
72
74
58
64
63
February
67.1
44
68
77
78
86
March
77.0
74
69
82
79
90
April
91.2
83
96
90
97
97
May
90.8
91
91
94
90
93
June
92.3
94
87
92
95
95
July
92.7
89
91
95
95
94
August
94.4
95
91
93
96
99
September
88.0
86
87
90
92
87
October
81.4
78
66
80
87
90
November
68.5
78
66
75
64
December
62.7
51
59
56
62
Average
84.3
82.8
81.2
84.8
86.4
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
4.5
4
6
6
3
7
February
5.4
7
6
7
4
7
March
7.6
8
8
9
8
8
April
11.5
11
11
11
10
13
May
16.3
19
16
15
13
15
June
20.1
18
22
19
21
20
July
20.8
20
20
21
23
18
August
21.5
21
20
24
20
24
September
18.0
19
21
17
18
18
October
13.4
13
13
15
13
13
November
8.2
7
9
9
10
December
5.0
5
1
4
6
Average
12.9
14.1
12.9
13.1
12.0
13.1
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
0.2
-1
2
2
-1
3
February
0.4
3
1
2
-3
2
March
0.5
3
1
-2
0
1
April
2.2
4
2
1
0
2
May
6.8
9
6
6
7
5
June
10.4
10
10
10
11
11
July
11.4
11
12
11
13
10
August
12.0
12
12
13
12
13
September
9.9
11
12
9
11
9
October
7.2
7
7
9
7
8
November
3.3
2
5
4
4
December
1.1
1
-3
-1
3
Average
5.6
6.7
5.5
5.5
4.8
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
29.5
29
37
35
29
28
February
33.8
47
18
44
24
53
March
18.3
12
35
5
20
15
April
14.4
31
14
16
14
6
May
12.1
13
4
13
31
13
June
11.6
24
4
18
6
13
July
18.1
25
36
14
12
22
August
14.9
15
21
5
17
11
September
17.4
20
14
21
14
10
October
30.6
22
51
21
27
31
November
31.2
45
45
35
30
December
29.5
42
24
25
40
Average
19.6
23.0
24.4
19.2
19.4
19.9
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
10.5
12
12
12
8
12
February
11.4
12
11
14
9
15
March
10.6
10
11
8
10
11
April
9.9
10
10
11
10
10
May
9.3
9
9
9
9
10
June
8.3
9
7
8
7
8
July
9.2
9
10
10
8
10
August
8.3
8
8
7
9
7
September
8.5
8
8
8
8
8
October
9.6
9
11
10
9
9
November
8.9
8
11
9
10
December
9.6
12
7
8
9
Average
9.4
9.2
9.5
9.4
8.7
9.6
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
247°
235°
261°
229°
239°
February
234°
269°
244°
098°
239°
March
137°
247°
105°
254°
233°
April
216°
066°
288°
309°
279°
May
096°
017°
261°
245°
285°
June
251°
280°
249°
280°
164°
July
239°
237°
270°
261°
256°
August
232°
256°
222°
266°
166°
September
128°
206°
155°
248°
240°
October
194°
234°
215°
218°
185°
November
198°
167°
242°
222°
December
249°
141°
203°
156°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.