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
70.2
80
66
72
83
February
57.0
0
72
91
50
75
March
57.8
0
93
82
87
72
April
61.0
0
90
89
77
82
May
60.9
0
100
93
79
78
June
63.6
0
92
85
89
July
70.1
0
100
98
97
August
70.1
0
99
91
94
September
64.5
0
93
93
83
October
43.7
0
68
61
65
November
63.7
78
46
59
December
69.3
85
82
56
Average
69.0
81.4
88.1
76.5
79.4
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
5.7
7
8
1
7
February
8.5
11
7
12
8
10
March
11.2
13
10
11
12
9
April
14.8
17
14
17
12
15
May
18.3
19
17
22
17
18
June
24.3
23
27
24
20
July
27.3
28
30
26
26
August
27.1
27
28
26
25
September
19.2
11
23
23
21
October
15.6
12
20
16
14
November
9.2
11
9
11
December
5.4
4
7
4
Average
15.4
18.2
9.0
18.4
15.2
15.6
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
2.2
3
4
0
4
February
4.1
5
4
5
4
7
March
6.2
6
5
5
8
5
April
9.3
6
10
9
9
12
May
12.1
7
11
15
13
15
June
15.8
3
19
20
17
July
18.5
7
22
22
20
August
18.4
7
20
22
21
September
13.2
3
16
17
17
October
10.9
6
15
12
10
November
6.5
7
7
9
December
3.0
1
5
2
Average
9.9
5.3
4.9
12.1
11.6
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
0
0
25
0
February
8.8
0
12
1
7
0
March
7.7
0
2
4
0
15
April
11.4
0
0
7
18
19
May
8.8
0
0
7
11
10
June
2.0
0
1
1
7
July
0.8
0
0
1
1
August
0.9
0
1
0
4
September
2.1
0
4
1
9
October
5.6
0
3
0
9
November
15.3
4
35
0
December
14.2
11
2
30
Average
6.7
3.6
3.3
7.4
8.4
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
3.0
4
4
0
0
February
3.2
4
3
5
0
0
March
3.4
5
5
4
0
0
April
3.8
6
4
6
0
0
May
4.5
5
3
5
4
3
June
4.7
4
5
5
5
July
4.6
5
5
5
5
August
4.1
4
4
4
5
September
3.3
3
4
4
4
October
2.9
4
3
3
3
November
2.6
3
4
3
December
2.3
3
3
3
Average
3.6
4.4
4.0
4.2
2.6
2.5
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
281°
026°
350°
360°
February
262°
323°
015°
360°
360°
March
236°
075°
348°
360°
357°
April
215°
005°
047°
360°
359°
May
181°
304°
057°
071°
360°
June
163°
057°
059°
076°
July
153°
048°
071°
070°
August
223°
323°
017°
086°
September
251°
037°
360°
275°
October
245°
329°
314°
021°
November
329°
274°
331°
December
268°
250°
251°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.