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
88.7
91
84
84
99
February
77.3
78
69
85
86
March
93.3
88
96
99
99
April
95.9
95
98
99
93
May
97.4
97
99
98
96
June
99.3
100
99
100
100
July
99.6
99
100
100
100
August
99.7
100
99
100
100
September
98.6
98
100
99
100
October
92.4
94
93
99
94
November
91.3
96
96
90
89
December
88.3
91
86
90
93
Average
94.1
94.5
94.4
96.3
95.4
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
8.3
9.0
9.3
8.3
6.2
February
10.6
12.8
10.1
11.0
9.9
March
14.2
14.5
14.5
15.5
14.1
April
17.4
19.0
16.1
16.1
15.6
May
21.7
21.8
21.6
24.1
19.3
June
27.3
26.5
27.1
29.3
28.0
July
29.7
30.8
29.1
32.0
28.6
August
30.0
32.2
29.1
30.1
27.6
September
24.6
24.3
27.1
23.1
25.8
October
19.6
19.5
21.6
21.8
18.0
November
13.8
14.0
14.1
14.4
13.0
December
8.9
10.5
10.0
7.7
8.5
Average
18.9
19.6
19.2
19.9
17.7
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
-1.8
-0.0
2.9
-2.1
-3.7
February
2.0
4.7
0.7
0.1
2.7
March
3.8
6.7
4.7
0.9
1.9
April
7.7
8.5
5.7
6.0
6.7
May
12.9
13.8
13.0
13.1
11.4
June
17.4
17.3
16.1
17.6
19.1
July
19.4
20.6
18.6
19.8
20.5
August
19.5
21.1
18.5
19.0
19.0
September
15.0
15.0
16.8
13.1
15.9
October
10.6
12.5
11.9
11.3
8.4
November
5.5
3.2
4.5
5.7
5.5
December
1.3
0.5
1.7
2.2
0.2
Average
9.7
10.3
9.7
9.2
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
5.3
7
9
2
1
February
8.5
20
0
6
8
March
7.5
21
4
5
0
April
8.1
6
9
6
8
May
12.9
16
22
5
15
June
3.6
3
5
3
1
July
1.3
2
2
0
3
August
2.3
2
7
1
1
September
4.7
7
1
5
3
October
8.6
21
10
2
5
November
9.8
3
8
8
12
December
11.4
1
9
26
8
Average
6.8
8.7
7.2
4.5
5.5
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
2024
2023
2022
2021
January
2.9
5
4
4
5
February
3.2
4
5
5
4
March
4.1
5
5
5
4
April
4.9
5
5
5
5
May
4.0
5
6
6
5
June
3.4
5
5
5
4
July
3.5
5
4
5
5
August
2.8
5
0
5
5
September
3.7
5
2
5
5
October
3.5
5
5
3
5
November
3.6
4
4
4
6
December
3.6
5
3
5
4
Average
3.3
4.7
3.9
4.9
4.8
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
028°
029°
016°
357°
February
032°
047°
024°
030°
March
046°
076°
074°
053°
April
060°
072°
091°
065°
May
049°
031°
068°
080°
June
071°
064°
109°
107°
July
058°
047°
089°
088°
August
106°
360°
047°
039°
September
050°
047°
051°
067°
October
032°
056°
087°
037°
November
040°
022°
026°
038°
December
016°
353°
020°
006°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.