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
2024
2023
2022
2021
January
81.9
91
43
72
92
February
90.3
93
92
95
88
March
93.4
97
95
90
92
April
93.7
95
97
86
99
May
92.6
96
98
78
97
June
97.8
98
99
91
99
July
97.8
99
96
93
100
August
97.8
100
96
90
100
September
99.0
100
100
97
99
October
95.4
93
97
94
96
November
91.6
98
85
91
96
December
81.2
91
74
82
83
Average
93.0
96.1
90.3
88.4
95.6
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
2024
2023
2022
2021
January
19.7
22.1
16.5
18.0
20.3
February
22.2
21.6
21.0
23.1
23.3
March
27.4
26.0
27.5
26.5
27.8
April
33.7
34.1
33.2
35.2
36.2
May
40.1
38.5
39.3
39.1
43.0
June
46.2
46.8
45.3
46.7
47.0
July
47.8
46.8
48.2
46.5
48.5
August
47.4
47.1
47.8
47.7
47.5
September
44.5
43.2
45.1
44.1
43.2
October
37.0
34.7
37.1
38.7
37.6
November
27.3
27.5
27.1
28.6
28.6
December
21.6
20.8
23.6
23.1
21.3
Average
34.7
34.1
34.5
35.2
35.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
7.3
8.9
8.0
6.2
7.7
February
9.4
10.4
8.6
10.1
10.9
March
13.6
12.8
13.8
12.3
13.0
April
19.7
18.1
18.8
19.3
19.8
May
24.4
22.5
24.6
23.1
26.1
June
27.1
27.1
26.6
28.6
25.3
July
28.8
28.3
24.1
30.1
27.8
August
27.1
28.8
26.5
29.3
25.8
September
23.4
23.3
22.3
21.1
21.8
October
18.8
17.5
19.5
19.3
17.1
November
14.1
13.8
14.1
15.4
12.4
December
9.0
4.7
10.6
12.0
8.5
Average
18.6
18.0
18.2
19.2
18.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
1.8
2
6
2
1
February
1.4
3
0
1
1
March
1.1
4
2
0
0
April
0.4
2
1
0
0
May
0.1
1
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.2
0
0
0
0
November
1.4
1
3
1
0
December
0.7
1
0
0
1
Average
0.5
1.1
0.8
0.3
0.2
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
2024
2023
2022
2021
January
9.2
11
7
8
8
February
9.4
10
9
9
9
March
10.3
11
9
10
11
April
10.5
12
10
9
11
May
10.8
13
11
11
9
June
13.8
12
16
11
16
July
13.1
15
13
13
11
August
11.0
13
11
10
10
September
10.0
12
10
9
12
October
8.0
10
9
7
9
November
8.5
11
9
8
8
December
8.4
10
7
9
8
Average
10.4
11.9
10.3
9.6
10.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
302°
262°
265°
245°
February
294°
289°
251°
278°
March
269°
189°
275°
282°
April
358°
276°
281°
278°
May
324°
289°
285°
288°
June
315°
281°
289°
273°
July
313°
282°
285°
282°
August
310°
270°
291°
288°
September
311°
296°
274°
287°
October
321°
309°
244°
287°
November
328°
291°
317°
281°
December
297°
295°
298°
237°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.