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
76.6
82
83
68
74
68
February
83.3
80
76
87
79
92
March
87.2
84
80
92
91
93
April
93.5
98
85
95
93
97
May
92.8
85
91
97
93
99
June
94.2
93
97
94
90
96
July
92.5
89
88
95
88
92
August
92.9
94
89
94
89
96
September
89.8
87
87
90
93
90
October
85.1
77
81
84
85
92
November
79.4
79
83
72
80
December
69.4
64
70
68
74
Average
88.5
87.4
84.1
89.0
86.2
90.8
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
6.2
6
8
7
6
8
February
8.6
11
9
10
8
10
March
11.4
13
11
13
11
11
April
14.6
15
13
14
11
18
May
19.3
20
19
21
16
20
June
23.2
21
26
23
24
23
July
23.8
23
23
25
23
22
August
24.2
25
23
27
21
27
September
20.5
21
23
20
21
21
October
16.0
16
17
18
16
15
November
10.2
10
12
9
12
December
7.2
9
3
8
8
Average
15.7
16.9
15.7
16.3
14.4
16.1
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
1.4
1
3
2
1
3
February
1.8
5
2
3
0
4
March
2.8
5
4
1
2
3
April
4.4
7
4
4
1
5
May
8.4
11
9
9
7
6
June
12.4
11
14
12
13
12
July
13.1
13
13
13
14
12
August
13.5
15
13
15
13
15
September
10.5
11
13
10
11
10
October
8.4
8
10
9
8
8
November
3.7
5
4
3
5
December
2.4
4
-3
3
3
Average
7.1
8.7
7.7
6.8
6.2
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
21.4
31
33
16
14
11
February
21.9
37
21
32
15
22
March
19.5
23
42
6
8
13
April
13.7
27
26
14
8
2
May
10.7
23
13
7
15
3
June
9.5
20
9
15
6
6
July
12.6
25
22
8
11
11
August
10.4
13
25
6
10
6
September
13.8
23
12
25
6
6
October
17.3
19
29
12
16
17
November
17.1
35
11
11
6
December
20.6
33
16
7
20
Average
13.5
23.7
24.8
13.4
10.3
9.2
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
9.3
10
11
8
9
9
February
10.0
10
8
13
8
14
March
9.0
8
9
7
9
11
April
8.2
9
8
9
7
8
May
6.8
6
7
7
9
7
June
6.6
7
7
7
5
7
July
6.9
7
9
6
6
7
August
6.7
7
7
6
7
7
September
7.0
8
7
6
6
7
October
8.1
7
9
7
8
9
November
8.2
10
8
7
8
December
8.8
11
5
8
8
Average
7.7
7.7
8.4
7.3
7.2
8.3
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
226°
223°
241°
227°
213°
February
214°
256°
230°
138°
225°
March
214°
230°
087°
250°
188°
April
233°
212°
010°
338°
068°
May
228°
015°
253°
231°
344°
June
250°
030°
236°
317°
224°
July
241°
230°
277°
242°
242°
August
223°
242°
343°
249°
214°
September
204°
196°
222°
198°
212°
October
199°
206°
206°
205°
202°
November
215°
192°
225°
199°
December
230°
154°
207°
194°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.