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
74.5
84
85
60
February
85.7
82
90
87
March
91.0
89
93
94
April
94.8
96
91
95
May
94.0
90
96
97
June
96.4
95
96
97
July
94.9
92
97
100
August
93.5
89
94
97
100
September
93.4
96
97
October
85.7
91
90
November
83.4
83
90
December
74.8
78
80
Average
90.4
90.2
91.7
92.1
100.0
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
8.2
9
9
7
February
11.4
12
11
12
March
14.3
14
14
15
April
16.5
17
16
17
May
21.1
19
21
23
June
25.3
22
27
26
July
26.2
25
25
29
August
26.1
26
25
29
21
September
22.9
26
23
October
19.8
20
21
November
13.0
13
14
December
8.9
11
6
Average
17.3
18.0
18.2
18.8
21.0
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
2.0
2
4
2
February
3.4
6
2
2
March
4.9
5
5
5
April
5.2
6
6
6
May
9.8
10
10
10
June
13.0
12
15
13
July
14.1
14
14
15
August
14.5
13
15
16
21
September
11.7
14
11
October
10.1
10
11
November
5.1
6
6
December
2.8
5
0
Average
9.9
8.4
8.6
8.3
21.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
10.1
5
9
4
February
12.2
19
5
4
March
10.3
10
9
6
April
6.1
7
4
4
May
7.2
12
3
1
June
4.7
5
3
4
July
5.0
5
2
2
August
7.2
4
6
2
0
September
10.5
4
4
October
12.8
11
7
November
15.3
9
12
December
18.6
8
8
Average
13.8
8.0
5.5
4.2
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
7.1
8
9
6
February
7.7
8
7
8
March
8.3
8
10
7
April
7.3
8
8
7
May
6.8
7
8
6
June
6.1
6
6
7
July
6.8
6
8
7
August
6.1
6
7
6
9
September
6.2
5
7
October
6.7
7
7
November
7.8
9
8
December
7.6
8
6
Average
8.0
6.9
7.5
6.8
9.0
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
209°
239°
234°
February
222°
034°
236°
March
205°
231°
101°
April
247°
283°
003°
May
225°
022°
351°
June
313°
022°
254°
July
261°
246°
029°
August
253°
262°
025°
007°
September
185°
240°
October
199°
187°
November
236°
210°
December
225°
067°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.