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
80.4
84
87
84
87
66
February
78.6
72
83
77
79
78
March
82.3
77
79
84
85
87
April
89.7
94
82
94
97
96
May
82.8
55
75
96
77
97
June
89.1
95
94
95
80
84
July
93.2
96
92
94
87
90
August
96.0
95
96
95
97
96
September
93.6
93
97
99
90
90
October
88.7
85
85
93
88
90
November
82.7
91
76
85
82
December
73.9
74
93
62
73
Average
87.3
85.1
86.6
91.2
85.3
87.5
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
7.6
7
9
8
7
9
February
7.2
9
8
8
5
9
March
7.8
9
8
9
7
8
April
9.8
11
10
10
8
10
May
12.4
10
12
13
11
13
June
16.4
16
17
16
16
16
July
18.4
18
18
19
18
17
August
19.5
20
18
21
18
20
September
17.9
19
20
18
18
18
October
15.1
15
16
16
16
15
November
11.3
12
12
12
12
December
8.6
9
7
9
9
Average
12.8
13.4
13.0
13.2
12.0
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
4.9
5
6
6
4
7
February
4.7
7
6
5
2
6
March
5.3
7
5
6
5
6
April
7.1
8
7
7
5
8
May
9.7
8
10
11
8
10
June
13.6
13
14
14
13
14
July
15.8
16
16
16
16
15
August
17.1
18
17
18
16
18
September
15.3
16
17
15
16
16
October
12.5
13
12
14
13
12
November
8.7
9
10
9
9
December
6.0
6
4
6
6
Average
10.2
10.7
10.4
10.7
9.5
10.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.6
13
9
4
14
11
February
11.6
19
3
14
11
21
March
8.9
8
12
5
11
1
April
6.3
15
6
5
2
3
May
5.4
6
6
6
12
1
June
6.8
8
5
6
7
8
July
5.2
10
11
5
4
5
August
5.4
5
7
3
6
6
September
7.9
9
5
7
5
3
October
10.8
10
15
5
10
18
November
10.8
25
8
10
5
December
12.1
17
7
13
11
Average
7.7
9.6
9.2
5.8
7.9
6.8
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
22.0
23
24
22
20
24
February
22.7
21
19
29
24
28
March
19.6
18
22
15
20
20
April
17.9
20
18
18
17
17
May
15.0
11
15
15
16
13
June
15.2
15
16
14
14
16
July
15.4
14
19
16
15
16
August
15.7
15
16
13
17
18
September
16.9
18
15
17
15
17
October
21.4
18
21
21
22
23
November
21.3
23
24
20
21
December
21.5
23
18
20
21
Average
17.9
16.5
18.4
17.6
17.6
18.6
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
245°
235°
266°
261°
232°
February
224°
276°
240°
164°
231°
March
198°
233°
107°
253°
221°
April
232°
080°
038°
344°
078°
May
110°
027°
245°
241°
305°
June
255°
056°
240°
003°
174°
July
240°
235°
267°
275°
242°
August
225°
243°
054°
287°
207°
September
141°
201°
322°
224°
227°
October
198°
222°
214°
217°
204°
November
001°
200°
275°
215°
December
288°
164°
218°
196°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.