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
77.9
84
80
78
88
61
February
79.0
65
82
83
74
87
March
83.2
79
75
83
83
95
April
89.2
88
80
91
99
95
May
85.1
81
74
92
88
94
June
89.4
96
89
91
80
89
July
90.8
92
83
91
88
91
August
96.1
96
97
95
95
September
91.0
88
95
94
88
October
88.2
84
88
89
93
November
82.3
89
79
86
79
December
72.3
74
86
54
72
Average
86.7
85.1
83.2
88.6
86.2
88.2
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
6.8
7
8
8
6
8
February
7.1
9
8
8
5
8
March
8.9
10
9
10
8
9
April
11.8
13
11
12
9
13
May
15.3
18
15
16
13
15
June
18.7
18
20
19
19
19
July
20.2
20
20
21
20
18
August
21.1
20
23
19
23
September
18.6
21
19
19
19
October
14.8
15
16
15
14
November
10.3
11
11
11
11
December
7.6
9
6
8
8
Average
13.4
13.5
13.8
14.2
12.6
13.6
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
3.5
3
5
5
2
6
February
3.3
6
4
5
1
5
March
4.3
6
5
4
4
4
April
6.1
7
6
6
4
6
May
9.4
11
9
9
8
8
June
12.7
12
12
13
13
13
July
14.1
15
13
15
15
12
August
15.4
15
16
15
16
September
12.9
14
12
13
12
October
10.7
11
12
11
11
November
6.6
7
8
8
7
December
4.2
5
1
4
4
Average
8.6
8.6
8.8
9.0
8.1
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.1
19
16
12
18
8
February
15.1
22
8
24
13
17
March
14.0
22
24
11
11
2
April
12.2
25
18
11
6
3
May
7.9
11
7
11
13
4
June
9.7
17
4
13
9
8
July
10.1
21
17
8
3
7
August
8.1
13
5
8
6
September
12.7
12
22
5
5
October
14.5
21
9
14
22
November
17.2
32
18
12
5
December
18.1
24
21
18
18
Average
11.6
19.2
15.9
12.8
9.9
7.9
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
18.0
19
19
18
16
18
February
17.7
16
15
25
15
23
March
15.9
15
18
12
16
18
April
15.2
18
15
17
15
13
May
13.3
13
13
14
14
13
June
13.4
15
13
13
12
14
July
14.0
15
17
14
12
14
August
13.7
14
12
15
15
September
13.8
13
14
12
13
October
17.2
18
17
17
18
November
16.9
20
18
15
14
December
16.6
20
14
15
15
Average
15.0
15.5
15.9
15.1
14.1
15.3
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
265°
239°
271°
263°
230°
February
218°
274°
245°
140°
236°
March
223°
230°
078°
258°
206°
April
260°
043°
329°
348°
046°
May
243°
011°
269°
263°
329°
June
267°
010°
276°
360°
273°
July
257°
249°
285°
286°
255°
August
262°
338°
296°
254°
September
202°
315°
240°
239°
October
226°
219°
214°
203°
November
232°
197°
276°
219°
December
248°
148°
212°
185°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.