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
99.1
99
99
100
98
100
February
99.5
99
100
99
100
99
March
99.4
100
100
100
99
99
April
100.0
100
100
100
100
May
100.0
100
100
100
100
June
99.9
100
100
99
100
July
99.6
99
100
99
99
August
99.7
100
100
100
99
September
99.9
99
100
100
100
October
100.0
100
100
100
100
November
99.8
100
100
100
100
December
99.7
99
100
100
100
Average
99.7
99.3
99.6
99.8
99.5
99.6
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
30.3
30.8
31.0
29.1
30.6
31.5
February
30.9
31.0
31.5
29.8
31.1
31.3
March
30.5
30.6
31.6
29.6
30.5
30.0
April
30.4
31.1
29.8
30.0
30.1
May
29.4
29.8
29.5
28.1
28.8
June
28.5
28.8
29.1
26.6
28.1
July
28.0
29.0
28.1
27.3
28.3
August
28.5
29.3
28.8
28.1
28.5
September
29.2
29.8
30.1
29.3
29.3
October
30.0
30.1
30.5
29.1
30.1
November
30.9
32.0
32.0
30.0
30.8
December
31.0
32.2
32.1
30.8
31.3
Average
29.6
30.7
30.5
29.9
29.3
29.7
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
25.9
27.5
26.8
20.6
26.6
27.8
February
26.8
27.8
27.8
25.8
25.0
26.6
March
26.7
26.6
28.0
26.1
26.1
26.6
April
26.5
27.0
25.1
26.6
25.5
May
24.7
24.6
25.6
25.0
22.8
June
23.4
23.1
25.3
22.8
22.8
July
22.1
23.6
23.6
18.8
21.1
August
23.5
24.1
24.5
22.0
22.0
September
25.5
24.3
26.3
25.8
26.0
October
26.6
26.1
27.1
26.3
27.0
November
27.8
27.8
28.6
27.3
28.6
December
27.7
28.1
29.0
26.5
28.5
Average
25.7
27.1
25.9
25.6
24.9
25.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.7
4
4
3
3
2
February
3.1
0
3
7
1
4
March
4.2
3
2
5
7
4
April
3.5
4
3
3
1
May
1.2
2
0
0
4
June
0.7
0
1
3
1
July
0.4
0
0
2
1
August
0.4
0
1
0
0
September
0.0
0
0
0
0
October
0.0
1
0
0
0
November
0.5
2
0
0
0
December
2.0
1
2
0
0
Average
1.6
2.8
1.5
1.7
1.6
1.3
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
8.3
11
7
6
8
10
February
7.8
11
7
7
6
10
March
7.5
8
8
8
3
7
April
8.1
7
7
2
10
May
9.4
10
7
5
10
June
10.1
10
6
9
10
July
10.8
8
9
10
12
August
9.6
8
10
9
10
September
9.7
10
8
7
11
October
10.5
11
10
7
12
November
10.7
10
10
9
12
December
9.6
9
8
11
10
Average
9.4
9.7
8.5
7.9
7.1
10.4
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
016°
250°
007°
026°
036°
February
014°
276°
033°
027°
022°
March
182°
147°
030°
314°
152°
April
177°
184°
195°
185°
May
186°
177°
181°
201°
June
190°
146°
194°
177°
July
151°
182°
166°
185°
August
136°
178°
136°
165°
September
126°
096°
099°
126°
October
089°
060°
044°
118°
November
093°
093°
035°
045°
December
041°
040°
052°
042°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.