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
81.8
89
83
84
89
63
February
80.6
72
82
89
70
88
March
85.1
85
78
89
84
95
April
89.5
94
79
89
98
98
May
88.8
86
80
95
91
98
June
91.0
94
93
95
84
94
July
92.4
94
90
94
87
89
August
96.1
96
96
96
96
September
93.3
94
98
92
90
October
89.7
84
90
87
91
November
83.7
89
81
85
84
December
74.2
75
85
66
71
Average
88.5
88.6
85.9
91.2
86.9
89.9
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
6.7
7
8
8
6
9
February
7.5
9
9
9
6
9
March
9.1
11
9
11
9
9
April
12.0
13
11
12
10
14
May
15.7
18
15
16
13
16
June
19.1
18
21
19
19
19
July
20.6
20
20
21
20
19
August
21.2
20
23
19
23
September
18.8
21
19
20
19
October
15.2
16
17
15
14
November
10.5
11
11
11
12
December
7.8
9
5
8
8
Average
13.7
13.7
14.1
14.5
12.9
14.1
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
3.1
3
5
4
2
5
February
3.1
6
4
4
1
5
March
4.0
6
4
4
4
4
April
6.0
7
6
6
4
6
May
9.5
11
10
10
8
9
June
13.1
12
15
12
13
13
July
14.5
15
15
14
14
13
August
15.1
15
16
15
17
September
12.7
14
12
13
12
October
10.4
11
11
10
9
November
6.1
6
7
7
7
December
3.8
5
0
4
4
Average
8.4
8.5
9.0
8.6
7.9
8.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.7
19
22
22
19
18
February
20.5
26
6
35
18
29
March
16.9
20
23
13
15
8
April
18.3
39
16
21
17
4
May
10.1
12
9
15
20
4
June
11.3
21
4
14
9
12
July
14.2
24
23
7
7
12
August
14.1
22
8
19
12
September
20.4
18
35
5
12
October
22.9
31
12
25
34
November
31.2
55
27
32
12
December
23.9
34
15
23
27
Average
17.2
22.8
20.9
17.8
16.0
13.7
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
13.1
13
14
12
12
14
February
13.8
14
11
18
12
18
March
12.3
11
13
9
12
14
April
11.5
13
12
12
11
11
May
9.7
9
9
10
11
10
June
9.6
11
10
10
8
9
July
10.6
11
13
10
9
11
August
10.0
11
8
10
10
September
9.7
9
8
9
10
October
12.3
13
12
12
13
November
12.0
14
13
10
12
December
11.8
14
9
10
10
Average
11.1
11.6
11.7
10.8
10.3
11.4
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
243°
233°
260°
248°
224°
February
213°
266°
238°
151°
232°
March
211°
227°
076°
254°
198°
April
246°
023°
341°
351°
044°
May
254°
016°
260°
255°
328°
June
261°
008°
272°
360°
284°
July
249°
244°
275°
270°
251°
August
261°
355°
278°
249°
September
203°
280°
233°
235°
October
219°
218°
210°
201°
November
223°
194°
253°
212°
December
238°
123°
206°
186°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.