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
95.2
96
96
97
93
98
February
97.9
96
98
98
97
100
March
95.3
98
99
89
91
96
April
96.9
99
98
89
98
May
97.6
94
96
100
98
100
June
97.5
98
96
100
94
97
July
98.0
99
99
100
99
August
99.4
99
100
100
99
September
92.7
99
100
100
98
October
98.8
100
100
100
100
November
98.4
98
99
100
100
December
98.1
99
100
98
99
Average
96.9
96.6
98.1
98.4
96.4
98.5
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
28.8
28.5
27.5
27.1
27.6
February
28.4
28.6
30.0
27.6
27.1
28.5
March
27.3
27.3
29.1
26.3
27.0
26.6
April
26.7
27.6
27.1
26.1
25.6
May
25.7
24.1
26.0
27.3
25.6
24.3
June
23.9
24.5
24.3
27.5
21.1
23.1
July
23.8
28.0
24.3
23.1
22.5
August
26.3
27.6
26.3
24.6
26.3
September
29.4
29.8
30.6
27.8
28.8
October
30.9
29.6
32.2
31.3
31.1
November
30.9
30.6
31.3
30.8
32.6
December
29.8
32.1
31.6
29.1
33.3
Average
27.5
26.5
28.7
28.3
26.7
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
22.2
23.0
22.1
21.6
21.8
23.1
February
22.6
22.6
22.6
22.3
22.3
23.6
March
21.8
21.6
22.3
20.5
21.8
22.0
April
20.6
19.8
19.1
21.1
20.6
May
18.5
17.3
17.8
18.1
19.1
18.1
June
17.4
16.8
18.3
17.3
17.1
17.6
July
16.7
17.3
15.8
16.5
16.1
August
19.0
18.3
17.8
18.3
18.0
September
21.8
21.0
23.3
21.5
21.0
October
23.6
22.5
23.3
24.6
23.6
November
24.7
23.8
23.6
24.6
25.5
December
23.7
25.0
22.8
22.8
26.3
Average
21.0
20.0
21.0
20.4
21.0
21.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
7.7
13
6
7
15
6
February
4.6
12
2
4
4
1
March
5.1
2
1
14
11
4
April
2.3
2
2
3
2
May
1.4
4
3
0
0
1
June
1.8
4
2
0
6
1
July
1.4
0
1
0
1
August
0.4
2
0
0
0
September
0.1
0
0
0
1
October
0.9
2
1
0
1
November
2.2
3
2
4
0
December
2.9
2
2
1
1
Average
3.0
6.5
2.2
2.4
3.9
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
6.6
8
7
6
7
6
February
6.5
6
7
7
6
6
March
6.8
7
7
7
7
6
April
6.6
7
7
7
7
May
6.4
7
7
7
6
7
June
6.8
7
8
7
7
7
July
7.0
7
7
7
7
August
7.8
8
9
8
8
September
8.4
9
8
9
8
October
8.8
9
9
8
9
November
7.9
8
9
8
8
December
7.3
8
8
7
9
Average
7.1
7.0
7.7
7.5
7.2
7.2
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
027°
242°
276°
240°
018°
February
340°
228°
044°
242°
047°
March
236°
242°
252°
240°
213°
April
215°
237°
240°
223°
May
226°
191°
122°
238°
195°
June
230°
138°
075°
208°
199°
July
064°
198°
105°
196°
August
170°
139°
123°
095°
September
106°
076°
085°
099°
October
114°
096°
088°
090°
November
079°
085°
093°
071°
December
058°
089°
076°
065°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.