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
99.7
100
100
100
100
100
February
99.5
100
100
98
100
100
March
99.7
100
100
100
100
April
99.5
100
100
100
100
May
99.0
99
100
100
98
June
98.9
100
100
100
100
July
99.4
100
100
96
100
August
99.3
100
100
96
100
September
99.5
100
100
100
100
October
98.9
100
100
100
100
November
99.3
100
99
99
100
December
99.5
100
99
100
99
Average
99.4
99.7
99.8
99.6
99.3
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
31.0
30.3
31.6
30.8
30.8
30.3
February
31.1
31.0
32.3
30.5
31.1
30.6
March
32.0
33.5
31.6
31.3
31.8
April
31.5
31.3
31.1
31.8
31.1
May
29.5
30.3
29.8
29.8
30.3
June
28.7
29.3
29.1
28.1
28.5
July
27.9
28.1
27.8
27.1
28.3
August
28.1
28.8
28.3
27.5
28.3
September
28.6
29.3
28.6
28.1
29.1
October
29.7
30.1
30.1
29.1
30.1
November
30.7
31.6
30.3
30.1
31.8
December
31.3
30.6
31.5
31.3
31.3
Average
30.1
30.6
30.6
29.9
29.7
30.1
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
25.3
25.8
24.8
25.8
26.5
24.3
February
25.3
25.1
26.3
25.6
25.3
24.3
March
26.1
27.5
26.3
26.8
25.5
April
25.8
26.5
26.1
27.0
26.3
May
24.9
26.5
23.8
26.3
25.8
June
24.7
24.8
24.5
24.3
23.8
July
24.0
24.6
22.6
23.6
24.3
August
24.0
24.6
24.0
23.8
23.8
September
23.9
23.8
24.6
23.1
24.8
October
24.3
25.1
24.6
24.5
25.1
November
25.4
26.6
25.3
25.1
26.1
December
25.3
26.6
26.3
26.0
24.8
Average
25.0
25.6
25.6
25.0
25.2
24.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.6
0
0
1
1
0
February
0.2
0
0
0
1
0
March
1.8
3
2
0
0
April
5.6
7
8
3
2
May
10.9
6
8
9
3
June
5.3
4
4
11
4
July
5.1
6
5
8
5
August
2.2
1
2
0
3
September
2.8
0
2
1
3
October
3.1
2
2
0
2
November
3.0
2
10
2
1
December
1.9
5
2
0
3
Average
3.2
0.2
2.9
3.6
3.2
2.3
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
10.6
10
9
12
10
11
February
10.6
10
8
10
10
10
March
9.3
8
10
10
10
April
11.1
11
9
11
14
May
12.1
15
11
12
15
June
12.8
12
10
13
13
July
12.4
12
12
12
14
August
12.4
12
13
12
13
September
11.9
13
11
13
12
October
10.6
11
9
12
11
November
7.4
7
6
7
9
December
8.2
8
6
8
7
Average
10.7
9.9
10.5
10.0
10.9
11.5
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
062°
057°
062°
063°
068°
February
069°
072°
071°
073°
071°
March
135°
105°
089°
099°
April
195°
172°
172°
190°
May
196°
185°
188°
188°
June
189°
190°
192°
185°
July
183°
186°
181°
188°
August
176°
183°
179°
182°
September
175°
179°
178°
178°
October
173°
160°
175°
165°
November
141°
175°
127°
134°
December
076°
069°
095°
098°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.