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
69.5
75
79
63
70
55
February
67.6
47
77
77
80
80
March
73.3
76
62
89
73
86
April
90.6
84
95
92
96
96
May
89.3
93
95
91
82
93
June
91.2
95
88
90
91
96
July
92.5
91
93
95
94
92
August
94.7
96
94
94
96
95
September
88.1
90
93
89
84
October
80.9
72
80
81
88
November
68.5
72
76
73
68
December
65.6
65
82
61
41
Average
84.1
84.9
84.2
87.2
84.5
85.0
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
4.9
4
6
6
3
8
February
5.4
7
7
7
3
7
March
7.3
8
7
9
7
8
April
11.4
11
12
11
10
12
May
15.9
20
16
15
13
14
June
19.4
18
21
18
20
20
July
19.8
19
19
19
22
18
August
20.8
21
19
23
19
23
September
17.7
21
17
18
18
October
13.3
13
15
13
13
November
8.5
7
9
9
10
December
5.4
5
2
5
6
Average
12.6
13.4
12.7
13.0
11.7
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
1.0
-1
2
3
-1
4
February
1.0
3
2
2
-3
3
March
1.2
4
1
-1
1
1
April
2.9
5
3
2
1
3
May
7.4
10
7
8
7
6
June
10.7
10
10
11
11
12
July
12.1
12
12
12
14
11
August
12.3
13
13
12
12
13
September
10.2
13
9
12
10
October
7.9
8
9
8
8
November
4.1
3
6
5
6
December
1.6
2
-2
0
3
Average
6.1
7.1
6.2
6.2
5.6
6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.2
15
14
10
25
16
February
18.1
25
8
23
9
26
March
12.2
12
25
1
10
7
April
9.0
21
6
7
7
7
May
8.9
10
3
9
23
6
June
8.6
12
3
9
7
12
July
10.7
13
19
9
8
14
August
9.9
10
11
6
9
9
September
13.1
9
13
7
8
October
20.1
32
14
23
17
November
17.8
23
21
19
11
December
20.2
21
9
16
35
Average
12.5
14.1
13.1
9.9
12.6
12.6
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
10.2
13
11
13
7
11
February
11.7
12
11
15
9
15
March
11.4
11
12
9
12
13
April
10.7
11
11
11
12
11
May
10.1
10
11
10
10
11
June
8.7
9
8
8
8
7
July
9.2
9
11
11
9
9
August
8.7
10
10
8
10
6
September
9.0
9
10
8
8
October
10.4
12
11
11
9
November
9.4
10
12
10
9
December
9.2
12
8
9
7
Average
9.8
10.3
10.4
10.1
9.4
9.5
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
234°
208°
271°
227°
232°
February
212°
252°
244°
097°
236°
March
115°
234°
117°
257°
229°
April
195°
082°
302°
314°
283°
May
083°
351°
262°
249°
294°
June
242°
290°
247°
293°
180°
July
226°
243°
274°
282°
251°
August
214°
254°
257°
280°
196°
September
206°
102°
246°
237°
October
233°
182°
211°
166°
November
147°
135°
251°
214°
December
250°
100°
174°
132°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.