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
99.3
99
98
100
99
99
February
98.7
97
100
100
95
100
March
99.1
98
100
99
98
100
April
98.9
99
100
98
98
99
May
99.0
99
99
100
98
100
June
99.7
100
100
100
100
100
July
99.3
100
99
100
98
100
August
99.6
100
99
100
100
100
September
99.7
100
100
100
100
October
99.2
99
99
100
99
November
98.7
99
99
99
99
December
98.1
99
98
96
98
Average
99.2
99.2
99.2
99.3
98.4
99.4
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
14.2
15
14
14
13
15
February
15.3
17
14
16
15
17
March
16.9
18
18
16
16
16
April
19.5
20
19
19
18
20
May
22.5
20
22
25
22
24
June
28.2
26
28
31
28
27
July
31.5
31
33
33
31
31
August
31.1
33
31
31
30
32
September
27.2
28
27
28
27
October
23.2
25
25
22
21
November
18.1
19
19
17
19
December
15.3
16
16
15
14
Average
22.0
22.5
22.3
22.9
21.4
21.9
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
5.6
7
6
4
5
6
February
5.7
8
4
5
6
8
March
6.7
8
7
5
5
7
April
8.7
10
9
8
7
9
May
12.7
12
13
14
13
13
June
17.2
16
18
20
17
17
July
20.2
20
22
21
21
19
August
20.3
22
20
21
20
21
September
17.3
18
18
18
17
October
13.4
16
15
12
12
November
9.9
12
11
10
9
December
7.1
7
8
7
7
Average
12.2
12.8
12.6
12.5
11.8
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.9
11
15
6
15
2
February
8.1
15
9
3
3
1
March
7.9
12
2
8
2
13
April
7.4
6
6
13
12
6
May
7.2
7
9
6
8
3
June
1.4
2
4
2
0
1
July
0.4
0
0
0
3
0
August
1.1
2
4
0
0
0
September
3.0
2
6
2
3
October
5.6
6
1
5
9
November
10.2
7
11
12
5
December
14.8
6
15
19
24
Average
5.7
6.1
5.2
5.0
6.1
4.9
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
7.5
8
8
6
7
6
February
7.1
8
6
7
7
9
March
8.4
8
10
6
7
8
April
7.5
8
9
9
6
8
May
7.4
8
6
7
9
8
June
7.2
8
6
8
7
9
July
7.6
7
8
7
8
7
August
7.5
7
9
7
8
9
September
7.6
7
9
7
7
October
6.9
8
6
7
7
November
7.2
13
7
6
5
December
7.2
8
7
8
6
Average
7.5
7.6
8.1
7.3
7.4
7.5
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
202°
202°
249°
207°
211°
February
218°
359°
230°
228°
214°
March
211°
213°
354°
337°
354°
April
229°
254°
235°
326°
351°
May
238°
344°
355°
220°
302°
June
229°
333°
309°
335°
228°
July
355°
241°
326°
271°
332°
August
352°
257°
343°
262°
272°
September
326°
230°
295°
279°
October
214°
258°
347°
212°
November
202°
209°
230°
357°
December
200°
199°
206°
202°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.