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
84.2
87
81
82
87
February
87.6
93
93
87
85
March
87.7
89
89
88
95
April
94.6
95
92
95
93
May
96.6
97
96
100
98
June
98.2
100
99
97
97
July
99.4
100
100
100
100
August
99.1
100
99
98
99
September
98.4
98
100
100
99
October
95.1
99
98
99
96
November
90.3
95
89
97
78
December
86.6
84
76
87
92
Average
93.9
95.1
93.5
94.9
94.1
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
8.4
9.3
11.0
7.9
10.0
February
10.4
12.8
10.5
9.9
10.5
March
12.6
13.6
13.0
8.0
10.1
April
17.6
20.0
16.6
17.5
15.1
May
22.3
21.3
20.5
22.8
22.6
June
27.5
30.8
25.8
27.1
25.5
July
30.3
32.7
31.6
30.1
30.1
August
30.7
31.6
31.6
30.8
30.8
September
27.0
27.1
27.8
27.1
25.3
October
21.4
21.8
23.6
21.5
18.1
November
15.8
14.0
17.1
17.5
15.3
December
11.1
10.5
12.3
13.0
10.6
Average
19.7
20.5
20.2
19.7
18.7
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
1.1
1.3
4.2
-1.5
2.7
February
1.9
4.0
0.3
1.0
2.3
March
3.1
4.0
4.4
-1.8
1.0
April
6.6
10.0
7.0
6.2
5.2
May
11.3
10.1
11.0
10.8
11.3
June
16.4
18.1
15.1
16.5
15.4
July
18.9
21.3
18.6
18.0
19.3
August
19.5
19.6
20.6
20.0
19.1
September
15.7
16.6
17.0
14.3
14.3
October
11.1
10.4
12.4
10.3
10.5
November
7.7
5.5
8.3
8.5
7.7
December
4.3
4.9
3.6
7.2
4.0
Average
9.9
10.5
10.3
9.4
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
13.9
17
7
10
17
February
11.8
9
9
19
9
March
11.2
12
9
17
13
April
7.6
8
12
11
10
May
3.7
3
6
3
5
June
2.2
0
3
3
3
July
1.1
1
0
1
1
August
0.7
1
0
1
0
September
2.4
2
2
2
2
October
3.5
0
2
2
3
November
7.1
4
11
6
6
December
13.4
18
14
13
21
Average
5.9
5.7
5.8
6.3
6.8
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
10.5
12
9
11
10
February
10.5
8
13
10
9
March
10.0
7
10
12
10
April
9.3
10
9
10
9
May
9.4
10
10
9
9
June
9.3
11
10
11
7
July
11.2
14
9
13
11
August
12.7
11
14
11
10
September
11.4
9
13
10
12
October
9.9
9
10
12
13
November
10.2
11
10
10
10
December
9.7
10
10
11
11
Average
10.4
10.3
10.6
10.8
10.0
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
352°
066°
345°
210°
February
221°
334°
013°
014°
March
097°
035°
009°
029°
April
022°
039°
041°
050°
May
036°
035°
037°
044°
June
043°
036°
022°
010°
July
021°
044°
036°
033°
August
030°
036°
029°
049°
September
018°
035°
040°
043°
October
022°
020°
024°
037°
November
024°
223°
049°
031°
December
020°
338°
033°
261°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.