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
70.7
76
84
63
62
68
February
80.6
72
77
80
82
86
March
87.2
92
85
90
87
92
April
93.5
94
94
95
94
97
May
93.7
96
93
91
89
97
June
95.1
96
97
97
94
92
July
94.7
95
89
96
97
95
August
95.5
95
93
96
93
97
September
92.1
96
92
89
93
October
86.4
79
89
95
85
November
74.4
84
77
79
74
December
67.9
56
78
57
71
Average
88.5
91.4
87.6
89.2
87.3
89.4
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
5.1
5
7
7
4
8
February
6.8
9
7
8
6
9
March
9.6
12
9
11
10
10
April
13.5
14
12
13
11
15
May
18.2
21
18
19
15
17
June
22.8
21
25
23
24
23
July
22.7
23
22
23
24
20
August
23.5
24
22
26
21
26
September
19.5
23
18
19
20
October
14.8
15
17
15
14
November
8.8
8
9
9
10
December
5.6
6
2
5
6
Average
14.4
16.0
14.4
14.9
13.4
14.6
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
1.3
0
3
3
0
3
February
1.3
4
2
3
-1
3
March
2.4
5
3
1
2
2
April
4.9
7
4
4
3
5
May
9.1
12
8
9
7
7
June
13.2
12
13
12
14
14
July
13.8
14
14
13
16
12
August
14.5
15
14
15
13
16
September
11.1
13
10
12
10
October
8.5
9
9
8
8
November
4.1
4
4
5
5
December
1.9
3
-3
1
3
Average
7.3
8.5
7.4
7.0
6.6
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.9
17
19
20
26
19
February
15.1
19
15
25
10
22
March
10.8
7
13
4
8
11
April
8.5
16
11
10
7
2
May
6.5
5
4
6
15
4
June
5.0
6
3
2
4
5
July
7.1
7
11
4
5
9
August
6.4
4
9
2
11
7
September
6.4
2
8
7
4
October
11.6
15
3
11
12
November
13.6
21
10
13
10
December
17.0
27
11
14
14
Average
9.6
9.2
10.8
7.3
9.9
8.7
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
11
11
8
10
February
9.6
10
9
13
8
14
March
9.1
8
10
7
10
10
April
9.2
9
9
10
10
9
May
8.4
7
8
8
9
9
June
7.6
8
7
7
7
8
July
8.0
8
8
8
8
8
August
7.2
7
7
7
8
7
September
7.4
6
7
7
7
October
8.3
8
7
8
9
November
7.8
8
7
8
8
December
8.2
10
5
7
7
Average
8.3
8.0
8.2
8.1
8.1
8.5
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
244°
233°
264°
242°
232°
February
242°
271°
243°
096°
238°
March
172°
250°
079°
260°
246°
April
240°
049°
321°
302°
292°
May
086°
358°
273°
251°
297°
June
260°
332°
281°
295°
005°
July
250°
239°
282°
260°
264°
August
244°
255°
314°
271°
211°
September
212°
246°
254°
239°
October
224°
226°
218°
210°
November
232°
179°
239°
217°
December
243°
121°
225°
170°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.