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
76.2
41
85
87
97
76
February
77.2
40
86
88
90
86
March
86.2
76
89
95
90
80
April
98.4
94
98
100
100
May
97.5
98
100
94
96
June
83.6
79
91
82
88
July
75.5
68
81
87
73
August
86.9
82
97
90
94
September
89.1
93
93
94
91
October
73.4
70
54
97
90
November
77.0
48
75
88
93
December
78.8
50
91
91
83
Average
79.9
51.5
77.2
86.2
91.6
87.3
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
30.9
31.6
31.0
30.1
30.1
31.6
February
31.3
32.0
31.3
32.6
30.3
31.8
March
31.6
34.3
31.1
32.2
32.0
31.8
April
31.8
32.0
31.3
32.2
32.1
May
32.1
32.5
32.2
31.6
31.5
June
29.6
29.6
31.0
29.3
29.5
July
28.7
30.1
28.3
28.5
28.1
August
28.6
29.1
29.1
28.0
28.3
September
28.8
29.1
29.1
28.6
28.3
October
30.8
30.3
31.5
30.5
30.8
November
32.3
32.6
32.2
31.6
31.3
December
31.6
31.6
32.8
31.5
30.5
Average
30.8
32.7
30.8
31.0
30.3
30.4
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
21.9
21.1
22.5
21.6
21.3
23.5
February
22.8
23.3
22.6
23.1
21.6
22.8
March
24.9
24.8
24.6
23.5
24.8
25.8
April
26.7
26.3
24.1
26.1
26.3
May
27.0
26.3
27.3
27.5
26.3
June
25.0
25.1
25.6
25.0
24.8
July
23.6
20.1
23.1
25.1
23.1
August
24.6
24.3
24.6
22.6
24.8
September
23.3
20.8
21.6
24.6
23.8
October
24.0
22.3
25.1
23.5
25.1
November
23.6
23.0
23.3
24.3
24.3
December
22.2
20.3
22.3
22.1
22.3
Average
24.0
23.0
23.1
23.6
24.1
24.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
0.1
0
0
0
0
1
February
0.0
0
0
0
0
1
March
0.0
0
0
0
0
0
April
0.5
1
0
1
0
May
5.3
2
0
10
16
June
46.8
36
33
50
67
July
57.1
48
71
39
69
August
34.7
37
23
13
42
September
30.8
18
42
9
40
October
4.8
5
2
1
6
November
1.9
0
0
0
9
December
1.4
1
0
1
2
Average
14.9
0.1
12.6
16.3
12.1
23.5
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
6.9
7
7
7
7
7
February
7.0
7
7
7
7
8
March
7.7
8
8
8
7
8
April
7.6
7
8
7
8
May
8.8
8
9
9
9
June
7.8
7
9
7
8
July
9.6
9
10
10
9
August
8.4
8
8
9
8
September
7.1
8
7
7
7
October
6.1
5
6
7
7
November
6.8
7
6
7
6
December
7.0
7
7
7
7
Average
7.5
7.0
7.3
7.7
7.5
7.6
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
017°
312°
318°
338°
317°
February
250°
279°
280°
306°
295°
March
284°
298°
297°
244°
245°
April
285°
283°
283°
293°
May
307°
318°
311°
256°
June
232°
260°
243°
251°
July
261°
279°
289°
277°
August
276°
287°
278°
265°
September
286°
258°
254°
250°
October
239°
284°
283°
262°
November
054°
038°
087°
095°
December
355°
057°
016°
042°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.