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
2020
January
81.2
63
83
83
67
100
February
88.8
83
90
83
80
94
March
91.1
84
93
88
92
92
April
89.3
75
96
97
83
May
88.3
75
72
94
96
June
0
0
0
0
July
85.5
98
75
78
88
August
93.9
90
92
90
92
September
94.5
88
100
87
96
October
95.6
96
94
93
97
November
97.2
90
100
100
91
December
100.0
0
0
0
0
Average
90.1
81.9
87.7
88.4
89.3
92.2
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
2020
January
2.5
2
3
2
2
4
February
2.2
2
4
1
3
3
March
2.1
3
0
4
4
2
April
4.3
5
4
4
3
May
7.2
7
7
7
6
June
10.5
12
11
11
12
July
13.2
15
13
13
13
August
13.4
15
13
13
13
September
11.2
11
11
11
11
October
7.7
6
8
8
9
November
5.5
4
7
5
7
December
3.4
2
3
2
5
Average
6.4
2.4
7.0
7.1
6.8
7.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
1.5
1
3
1
1
3
February
1.2
2
2
1
2
1
March
1.1
3
-1
4
2
1
April
3.3
4
3
3
3
May
5.9
6
6
6
5
June
9.1
10
9
9
10
July
11.6
13
12
11
11
August
12.0
13
12
11
12
September
9.9
11
10
9
10
October
6.8
6
8
7
8
November
4.5
3
6
4
6
December
2.5
2
1
2
4
Average
5.3
1.7
5.8
6.1
5.7
6.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.0
50
33
17
17
0
February
19.1
23
20
8
16
23
March
13.9
24
10
14
15
14
April
8.7
9
4
7
14
May
11.4
13
30
5
12
June
0
0
0
0
July
8.7
5
13
18
12
August
10.6
6
21
18
4
September
13.9
17
9
6
22
October
15.6
17
20
17
12
November
24.3
0
0
25
46
December
0.0
0
0
0
0
Average
14.4
25.5
11.9
14.9
12.6
14.5
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
2020
January
16.0
20
15
13
13
22
February
14.9
14
14
15
15
14
March
13.8
12
13
14
12
16
April
10.7
11
12
11
11
May
11.2
12
11
11
11
June
0
0
0
0
July
9.7
8
10
11
9
August
9.8
9
11
10
10
September
12.3
14
12
12
14
October
13.0
12
12
14
12
November
12.8
13
13
11
13
December
22.0
0
0
0
0
Average
12.2
13.6
11.7
12.1
11.7
12.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
189°
291°
298°
100°
102°
February
175°
237°
125°
154°
227°
March
111°
002°
224°
197°
212°
April
113°
018°
307°
303°
May
220°
238°
027°
241°
June
360°
360°
360°
360°
July
352°
267°
268°
339°
August
011°
245°
268°
240°
September
137°
066°
201°
222°
October
026°
220°
074°
045°
November
060°
081°
186°
215°
December
360°
360°
360°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.