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
74.6
77
64
81
73
82
February
78.2
83
75
80
68
77
March
93.8
90
93
95
93
90
April
96.4
95
94
94
99
May
92.6
91
92
91
88
97
June
88.5
85
80
87
84
94
July
87.2
92
88
82
84
August
88.6
90
87
86
89
September
92.5
94
92
84
91
October
91.6
100
89
89
95
November
86.3
85
76
68
93
December
79.6
65
78
66
87
Average
87.3
86.1
86.7
87.5
81.4
89.8
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
33.8
31.3
34.0
32.1
35.1
34.7
February
35.0
35.7
35.2
34.6
36.6
33.2
March
34.4
35.8
34.7
33.3
35.7
34.2
April
32.8
34.5
31.5
29.6
35.1
May
32.2
32.8
34.6
32.2
30.6
33.2
June
31.3
32.1
31.5
31.1
30.6
32.1
July
29.9
29.8
31.0
29.0
30.3
August
30.1
28.3
31.1
29.6
30.6
September
31.0
30.3
32.2
29.1
31.6
October
30.0
24.6
31.3
28.8
31.0
November
30.3
24.3
28.5
31.1
29.8
December
31.7
25.5
31.1
31.3
33.0
Average
32.0
33.5
30.6
31.7
31.4
32.4
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
19.5
19.5
18.3
23.6
19.6
20.6
February
21.8
22.5
22.0
22.5
21.6
21.3
March
23.1
23.6
24.1
23.1
23.6
22.6
April
22.9
23.8
24.1
21.6
23.1
May
22.4
22.6
24.1
22.0
21.8
22.5
June
22.4
22.0
23.1
22.3
22.6
22.3
July
21.8
23.0
22.6
21.8
19.6
August
21.9
22.6
22.3
22.8
21.6
September
21.7
22.6
22.6
21.3
20.1
October
21.9
22.8
22.1
21.1
22.6
November
22.1
21.6
22.6
22.8
23.5
December
19.4
19.6
20.3
22.8
21.0
Average
21.8
22.0
22.3
22.4
21.9
21.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.0
0
0
0
0
0
February
0.2
0
0
0
0
1
March
0.7
2
1
0
0
2
April
0.8
0
3
2
1
May
2.2
4
2
1
1
1
June
2.0
1
0
1
2
3
July
2.7
3
1
2
2
August
3.6
4
1
2
1
September
3.3
1
0
6
5
October
3.0
0
3
1
2
November
0.5
0
2
0
2
December
0.0
0
0
0
0
Average
1.5
1.4
1.1
1.0
1.3
1.5
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
4.0
4
5
5
4
3
February
4.5
5
5
5
4
3
March
5.0
5
5
5
5
4
April
5.1
6
5
5
5
May
4.3
5
5
4
4
4
June
3.9
4
4
4
4
4
July
3.6
4
4
4
3
August
3.7
4
4
4
4
September
3.8
4
4
4
4
October
3.5
4
4
4
4
November
3.2
3
4
3
4
December
3.3
5
5
4
4
Average
4.1
4.6
4.6
4.3
4.0
3.8
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
251°
300°
240°
325°
229°
February
242°
280°
267°
257°
283°
March
199°
193°
202°
208°
203°
April
197°
206°
198°
194°
May
191°
193°
208°
217°
219°
June
233°
255°
245°
223°
232°
July
248°
257°
241°
237°
August
266°
261°
270°
268°
September
337°
259°
252°
249°
October
005°
226°
229°
242°
November
030°
211°
213°
190°
December
002°
302°
226°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.