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
80.8
94
87
72
76
77
February
92.4
95
86
99
88
97
March
94.3
95
89
97
91
97
April
95.7
98
93
96
94
100
May
96.9
98
95
100
99
99
June
96.9
95
96
100
98
97
July
97.5
99
99
99
94
99
August
96.4
96
95
97
94
99
September
93.7
96
92
93
99
October
93.7
94
94
94
94
November
82.6
91
87
80
81
December
81.2
89
65
75
78
Average
93.3
96.4
93.3
93.8
90.9
94.3
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
3.7
4
6
5
2
5
February
6.4
10
7
8
5
8
March
9.8
12
9
11
9
9
April
13.0
15
12
12
10
12
May
18.0
20
18
19
15
17
June
22.9
21
24
24
24
21
July
23.4
23
23
25
22
22
August
24.1
25
23
27
21
26
September
19.7
23
18
20
21
October
14.8
16
17
14
13
November
8.0
8
10
7
9
December
4.8
6
0
5
6
Average
14.3
16.1
14.6
15.0
12.8
14.1
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
0.1
-1
2
2
0
2
February
0.9
5
1
3
-1
3
March
2.5
4
3
1
3
2
April
4.6
6
4
4
3
5
May
9.0
11
7
9
9
10
June
13.6
11
12
13
17
15
July
13.7
13
13
14
15
14
August
14.1
15
14
15
13
16
September
10.0
12
9
11
11
October
7.9
9
8
7
9
November
3.6
3
4
4
4
December
1.6
3
-4
1
3
Average
6.9
7.9
6.8
6.9
6.9
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.2
16
22
20
30
8
February
15.6
22
21
17
19
19
March
11.9
8
25
2
9
12
April
9.2
14
13
12
10
2
May
6.5
10
8
2
8
6
June
4.4
7
5
3
2
7
July
6.8
7
9
5
10
6
August
4.8
5
8
1
8
3
September
5.7
2
14
2
3
October
9.6
15
6
7
11
November
12.1
28
8
14
1
December
17.0
28
21
13
8
Average
9.2
9.9
13.6
7.7
10.1
6.9
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
8.3
9
9
9
7
8
February
9.1
9
8
13
7
12
March
8.8
8
9
6
9
10
April
8.3
8
8
8
9
8
May
7.1
6
6
7
10
7
June
6.7
6
6
7
6
7
July
7.0
6
8
8
7
7
August
6.7
7
6
6
7
7
September
6.5
6
7
6
6
October
8.2
8
7
8
9
November
7.4
9
7
7
7
December
7.8
9
5
7
7
Average
7.6
7.1
7.3
7.5
7.4
7.9
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
226°
214°
259°
231°
207°
February
216°
255°
232°
154°
234°
March
184°
227°
097°
261°
167°
April
228°
117°
335°
304°
050°
May
118°
030°
275°
237°
334°
June
247°
023°
297°
304°
294°
July
222°
236°
295°
237°
281°
August
226°
236°
002°
265°
225°
September
170°
237°
228°
197°
October
206°
193°
192°
200°
November
215°
176°
222°
182°
December
226°
105°
199°
167°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.