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
99.6
100
100
100
100
100
February
99.6
100
99
100
100
100
March
99.5
99
99
99
100
100
April
98.1
99
98
96
98
May
96.5
94
96
99
92
99
June
94.8
93
89
97
91
96
July
96.9
93
97
95
98
August
96.3
94
97
94
97
September
94.5
91
94
92
95
October
94.4
94
93
92
97
November
93.8
80
95
94
99
December
99.3
99
99
100
100
Average
97.0
97.0
94.3
97.2
95.1
98.1
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
27.9
28.0
29.1
27.5
28.0
27.8
February
28.6
28.6
28.8
28.0
28.1
28.8
March
29.4
29.8
30.8
28.3
29.3
29.0
April
29.3
30.3
29.1
28.3
28.1
May
28.1
28.8
28.6
29.6
27.0
27.6
June
27.2
26.8
27.0
28.3
25.5
27.1
July
27.6
27.5
28.6
26.8
27.1
August
27.4
28.1
28.3
27.0
26.5
September
27.2
27.0
28.6
27.3
27.0
October
26.3
26.8
26.6
26.1
26.8
November
26.4
24.8
27.3
25.8
27.1
December
27.3
26.8
28.1
26.6
27.8
Average
27.8
28.4
27.9
28.2
27.2
27.5
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
19.3
19.8
20.3
18.8
18.6
19.1
February
19.3
20.1
20.0
19.8
18.6
19.3
March
19.5
19.8
20.3
18.5
19.5
19.3
April
19.9
20.8
19.8
19.5
19.8
May
19.9
20.3
20.1
20.6
19.3
19.8
June
19.5
19.8
20.1
19.5
18.1
19.3
July
19.6
19.8
20.1
19.3
19.6
August
19.5
20.0
20.5
19.1
19.1
September
18.8
20.0
20.1
17.5
18.0
October
19.1
19.8
20.1
18.8
19.1
November
19.1
19.3
19.3
18.3
19.3
December
19.6
20.3
20.0
19.1
19.6
Average
19.5
20.0
20.1
19.7
18.8
19.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
1.2
4
1
1
0
1
February
0.8
4
1
0
0
1
March
1.6
2
0
6
3
1
April
5.6
5
1
11
10
May
10.3
8
7
7
15
9
June
11.8
12
17
12
16
8
July
10.8
11
9
14
13
August
8.9
7
11
9
11
September
12.0
16
11
13
10
October
14.2
15
18
14
9
November
13.2
30
12
14
6
December
2.5
5
2
0
1
Average
7.6
5.9
9.7
7.7
9.5
6.6
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
12.7
12
13
12
12
12
February
13.8
13
13
16
14
12
March
12.5
11
11
10
12
13
April
9.8
11
11
8
9
May
7.3
8
7
9
6
8
June
6.8
7
6
7
6
7
July
8.0
7
9
7
8
August
7.5
7
8
7
7
September
6.7
6
8
6
7
October
6.4
7
6
6
7
November
7.5
6
7
6
9
December
11.2
10
11
11
11
Average
9.3
9.9
8.5
9.5
8.3
9.0
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°
100°
097°
100°
095°
February
096°
101°
091°
094°
105°
March
107°
107°
107°
103°
102°
April
109°
113°
127°
113°
May
154°
222°
109°
233°
124°
June
198°
241°
202°
231°
199°
July
158°
112°
132°
107°
August
194°
135°
210°
202°
September
239°
180°
247°
225°
October
218°
245°
228°
236°
November
237°
177°
206°
110°
December
095°
099°
096°
099°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.