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
2025
2024
2023
2022
2021
January
98.6
100
100
99
100
98
February
99.2
99
99
100
100
98
March
99.4
100
99
100
100
April
99.1
100
100
100
100
May
99.7
100
100
100
100
June
99.8
100
100
100
100
July
99.8
100
100
100
100
August
99.9
100
100
100
100
September
99.7
100
100
100
100
October
99.3
99
100
100
99
November
98.9
99
97
99
97
December
98.5
99
99
98
97
Average
99.4
99.1
99.6
99.5
99.7
99.2
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
2025
2024
2023
2022
2021
January
14.2
16.5
15.4
15.4
13.4
15.3
February
15.4
14.0
17.0
14.5
15.5
16.3
March
17.6
18.5
17.6
15.8
16.1
April
20.6
23.0
19.0
20.6
19.6
May
24.8
24.8
23.6
25.1
25.1
June
29.9
33.3
29.1
31.1
29.3
July
33.2
35.6
34.2
34.1
33.5
August
33.5
34.6
33.2
32.7
33.8
September
29.2
28.8
29.6
28.8
29.0
October
24.8
25.6
26.8
25.1
22.1
November
20.2
19.8
21.1
20.6
19.8
December
16.1
15.8
17.1
18.3
15.0
Average
22.4
15.3
24.3
23.5
23.6
22.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
5.7
7.9
6.2
6.4
4.2
7.5
February
6.2
6.7
6.7
4.4
5.4
6.2
March
7.0
7.7
7.5
4.7
6.5
April
9.7
10.8
9.1
9.6
8.8
May
13.5
14.1
13.4
12.6
13.3
June
18.4
20.6
17.8
19.8
16.8
July
20.9
22.8
21.1
21.3
21.3
August
21.4
22.0
20.3
21.1
21.6
September
18.0
18.6
18.8
17.1
17.3
October
14.2
14.0
15.5
14.0
14.4
November
11.0
10.4
11.1
10.5
12.5
December
7.7
7.5
7.7
11.0
6.9
Average
12.2
7.3
13.5
12.8
12.7
12.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.9
7
5
7
5
8
February
5.1
10
4
1
5
4
March
3.8
3
4
4
4
April
3.0
3
6
3
2
May
1.9
2
5
2
1
June
0.8
0
1
0
0
July
0.1
0
0
0
0
August
0.1
0
0
0
0
September
1.9
2
2
1
1
October
2.6
0
1
0
10
November
5.9
10
4
5
9
December
9.0
10
2
11
12
Average
3.7
8.4
2.7
2.4
2.3
3.6
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
2025
2024
2023
2022
2021
January
5.6
5
7
5
5
7
February
6.0
7
5
6
6
6
March
5.3
4
5
6
6
April
5.7
6
5
6
6
May
4.8
6
6
4
4
June
4.0
4
4
4
3
July
4.5
5
3
6
5
August
5.2
4
5
4
5
September
5.5
4
6
5
5
October
5.3
5
4
6
6
November
5.7
6
4
5
7
December
5.1
6
3
6
6
Average
5.3
6.2
5.0
4.5
5.3
5.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
093°
054°
131°
043°
194°
February
055°
064°
071°
007°
063°
March
009°
013°
044°
016°
April
007°
233°
028°
004°
May
005°
040°
351°
295°
June
342°
349°
298°
277°
July
346°
300°
358°
329°
August
317°
331°
314°
326°
September
288°
030°
307°
010°
October
032°
040°
028°
051°
November
034°
207°
091°
069°
December
080°
130°
083°
141°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.