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
95.7
99
100
98
76
100
February
92.6
97
100
100
98
96
March
90.8
99
100
99
98
99
April
92.8
88
99
100
100
May
92.1
99
94
99
98
99
June
88.4
100
99
98
100
99
July
98.5
100
100
100
99
August
99.4
100
98
100
98
September
99.6
99
100
100
99
October
99.7
99
100
100
100
November
99.7
100
99
100
100
December
98.4
100
100
100
100
Average
95.7
98.9
98.2
99.2
97.3
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
35.5
35.2
34.3
35.0
35.6
38.2
February
35.2
35.1
36.7
35.2
35.8
33.7
March
36.5
37.2
35.5
36.1
37.8
34.3
April
35.1
35.2
33.2
36.0
34.7
May
31.2
31.1
31.8
30.3
30.0
31.3
June
27.8
28.3
28.3
26.8
28.3
25.8
July
28.4
28.1
27.6
27.3
28.6
August
30.0
30.6
31.6
29.5
30.1
September
33.2
33.8
34.7
30.8
32.6
October
35.1
35.7
37.8
32.0
33.2
November
35.5
37.1
36.5
31.6
34.6
December
36.8
36.6
35.8
37.2
39.2
Average
33.3
33.4
33.6
33.4
32.5
33.0
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
26.9
26.8
26.6
26.5
27.1
27.3
February
26.5
27.3
27.3
26.6
25.8
25.8
March
26.0
27.1
26.0
26.8
26.6
24.1
April
22.5
22.8
22.8
23.5
21.5
May
18.0
17.5
18.6
17.1
20.3
19.5
June
14.7
13.8
15.5
13.9
15.5
16.1
July
13.6
14.9
13.5
12.0
14.9
August
14.7
16.5
16.1
15.0
15.0
September
17.7
22.0
18.5
17.1
17.0
October
20.5
22.5
21.0
19.8
18.8
November
23.4
26.6
23.8
21.6
22.6
December
25.9
26.6
24.6
25.5
27.3
Average
21.0
22.4
22.1
20.9
20.6
20.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.2
8
0
3
0
2
February
2.6
12
0
1
3
4
March
1.2
0
2
1
0
2
April
1.4
0
4
4
0
May
1.7
1
1
0
9
4
June
2.0
1
4
3
0
6
July
0.0
0
0
0
0
August
0.4
2
0
1
0
September
0.5
2
0
2
0
October
0.1
0
0
1
0
November
0.4
0
0
3
1
December
0.5
0
0
0
0
Average
1.3
4.4
0.8
0.9
1.9
1.4
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
13.1
13
15
12
14
13
February
12.6
14
13
12
11
13
March
11.3
11
12
11
11
12
April
11.1
14
12
11
12
May
11.9
12
12
14
11
11
June
11.3
12
11
10
12
11
July
11.1
12
12
11
11
August
11.3
10
11
12
12
September
11.8
13
12
12
12
October
13.0
13
12
14
13
November
13.3
14
14
13
14
December
13.6
13
15
15
13
Average
12.1
12.2
12.7
12.3
12.1
12.2
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
353°
314°
333°
319°
333°
February
323°
324°
345°
003°
316°
March
007°
019°
320°
347°
015°
April
070°
064°
004°
037°
May
075°
068°
073°
096°
069°
June
094°
066°
108°
097°
102°
July
084°
089°
068°
039°
August
017°
030°
073°
059°
September
032°
344°
322°
019°
October
328°
012°
325°
329°
November
331°
319°
335°
327°
December
345°
305°
309°
321°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.