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
78.0
88
83
77
73
83
February
88.7
96
87
99
85
97
March
94.5
92
97
98
94
98
April
95.9
99
95
93
97
100
May
95.2
93
97
96
97
98
June
95.8
96
100
99
95
84
July
97.5
99
99
98
93
98
August
96.4
93
96
96
96
96
September
94.6
97
95
95
90
October
89.7
96
94
82
91
November
72.9
96
79
60
62
December
77.8
89
53
69
68
Average
91.7
94.9
95.2
92.7
88.4
90.5
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
3.6
5
5
4
2
6
February
7.1
10
6
8
8
9
March
10.6
13
11
11
10
10
April
14.5
15
12
13
12
18
May
18.5
19
19
21
15
18
June
24.0
23
25
25
25
20
July
24.9
25
25
27
23
25
August
24.6
26
24
26
21
25
September
20.0
24
18
21
20
October
15.4
17
18
13
13
November
7.5
8
9
5
8
December
4.4
6
0
5
4
Average
14.9
16.9
15.2
15.3
13.2
14.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-3.7
-3
-1
-1
-3
-2
February
-1.1
3
-1
0
-2
1
March
0.5
3
1
-2
-1
0
April
2.8
4
3
2
0
2
May
7.7
9
8
8
6
6
June
12.2
13
12
12
12
11
July
12.4
14
13
11
13
11
August
13.1
14
14
13
12
13
September
8.5
11
9
8
8
October
5.4
6
8
4
5
November
1.6
3
2
0
2
December
-1.4
0
-4
0
-1
Average
5.2
7.0
5.8
5.0
4.0
4.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.8
21
18
16
25
2
February
10.0
9
10
7
12
15
March
9.1
10
11
2
12
11
April
9.7
15
14
13
6
1
May
9.0
10
7
6
18
7
June
5.2
4
3
6
3
15
July
5.2
5
4
4
8
3
August
6.9
7
13
4
7
11
September
6.6
3
12
2
8
October
6.8
6
6
2
15
November
11.6
21
9
16
7
December
12.3
17
17
9
10
Average
8.6
9.4
9.4
7.5
9.4
8.6
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
7.4
8
8
8
7
6
February
7.5
8
8
11
5
10
March
7.9
6
9
6
7
9
April
6.9
7
7
8
6
6
May
6.0
6
6
5
8
6
June
5.5
5
6
5
5
6
July
5.2
5
6
6
5
5
August
5.0
5
6
5
6
5
September
4.9
4
6
4
4
October
5.7
6
5
5
6
November
5.8
9
5
5
4
December
6.7
8
4
6
5
Average
6.1
6.0
6.7
6.1
5.7
6.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
241°
250°
261°
237°
222°
February
243°
266°
247°
090°
240°
March
251°
246°
063°
266°
169°
April
252°
315°
302°
310°
026°
May
258°
047°
297°
254°
327°
June
242°
027°
265°
345°
277°
July
278°
248°
303°
270°
273°
August
295°
261°
050°
266°
263°
September
096°
252°
029°
265°
October
235°
213°
253°
235°
November
243°
234°
247°
197°
December
243°
043°
233°
202°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.