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
75.8
87
63
93
80
87
February
81.9
88
96
97
72
98
March
88.3
83
95
94
91
95
April
94.6
95
82
98
97
100
May
97.9
97
100
100
99
99
June
98.4
97
100
99
98
98
July
99.1
99
99
100
100
100
August
99.0
100
98
98
98
100
September
96.7
95
100
97
100
98
October
91.1
93
99
99
98
87
November
73.7
91
66
82
75
December
64.4
79
51
67
43
Average
90.9
94.2
93.0
93.7
92.0
92.0
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
3.0
4
6
4
4
6
February
6.4
11
7
9
4
10
March
10.9
12
13
9
9
14
April
16.9
21
13
16
14
19
May
22.3
23
23
23
21
20
June
27.9
30
27
28
25
28
July
29.6
33
30
30
30
30
August
30.1
31
32
30
27
31
September
24.4
25
27
22
21
27
October
17.9
17
22
18
16
20
November
9.5
11
10
11
8
December
5.1
7
4
4
5
Average
17.4
20.5
18.0
17.1
15.5
18.0
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
-5.9
-5
0
-3
-3
-3
February
-2.2
2
-2
-2
-4
0
March
0.2
2
1
-3
-1
3
April
4.9
7
6
5
2
4
May
9.7
9
10
9
9
9
June
15.7
17
15
15
15
16
July
16.8
19
18
16
18
16
August
16.5
18
18
18
15
16
September
11.4
14
13
11
8
12
October
6.2
7
7
5
2
10
November
1.8
2
2
1
2
December
-1.2
-1
-1
-1
1
Average
6.6
8.8
7.1
6.2
5.1
7.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.4
15
20
19
21
4
February
13.9
3
15
2
17
6
March
11.5
15
4
14
14
4
April
9.1
7
25
8
10
0
May
5.4
3
5
2
9
10
June
3.4
2
4
1
8
3
July
2.8
3
7
2
2
2
August
1.6
3
3
2
2
0
September
4.9
13
1
5
4
1
October
2.8
3
2
1
3
4
November
12.8
16
12
6
13
December
18.9
3
20
20
27
Average
7.6
6.1
7.9
6.1
8.8
5.3
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
7.9
8
9
10
7
7
February
8.5
9
10
8
8
10
March
9.0
9
9
9
9
10
April
8.7
8
9
10
7
9
May
7.9
8
8
7
8
9
June
7.1
6
7
8
8
6
July
6.7
7
7
7
6
7
August
6.7
7
6
7
7
7
September
7.1
8
7
7
7
7
October
7.3
7
9
7
7
7
November
7.4
9
7
7
6
December
7.7
7
7
9
8
Average
7.6
7.4
8.1
7.9
7.3
7.7
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
310°
113°
327°
253°
331°
February
235°
335°
314°
336°
301°
March
078°
285°
001°
351°
004°
April
340°
008°
321°
316°
316°
May
088°
041°
333°
306°
329°
June
319°
359°
015°
356°
355°
July
334°
319°
338°
351°
357°
August
346°
032°
008°
343°
028°
September
064°
055°
327°
332°
359°
October
341°
279°
326°
043°
165°
November
295°
019°
263°
009°
December
293°
080°
340°
090°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.