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
83.0
84
95
82
83
86
February
90.3
98
86
99
92
97
March
96.7
94
98
91
99
100
April
97.0
99
97
95
99
100
May
97.7
99
98
98
99
99
June
98.8
99
99
99
97
98
July
99.6
100
100
100
100
99
August
98.4
99
98
98
98
100
September
96.8
98
95
96
99
October
89.6
96
88
84
93
November
84.1
98
88
80
73
December
79.0
90
54
76
84
Average
94.0
97.1
96.7
92.8
92.9
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
2020
January
5.5
7
8
5
5
8
February
9.1
12
8
10
10
9
March
12.5
14
13
15
12
11
April
15.6
17
14
15
13
17
May
20.1
21
21
23
17
20
June
25.4
23
28
27
26
22
July
26.7
26
27
29
24
27
August
26.4
28
26
29
23
28
September
22.2
26
21
23
22
October
17.1
20
20
16
15
November
9.5
11
12
7
10
December
6.4
9
2
6
7
Average
16.8
18.3
17.4
17.8
15.6
16.5
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
1.0
-1
3
1
2
3
February
2.6
5
1
4
3
5
March
4.9
5
4
5
4
6
April
6.8
7
5
7
5
8
May
11.9
11
10
14
11
13
June
17.0
14
14
18
18
17
July
17.2
16
16
18
17
18
August
17.3
16
16
17
16
20
September
12.9
13
11
13
16
October
9.1
9
11
7
10
November
4.7
5
6
3
6
December
2.7
4
-2
3
4
Average
9.3
9.0
8.4
9.5
8.8
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.6
16
9
7
26
8
February
8.3
9
6
7
13
13
March
9.4
9
8
4
6
16
April
9.5
11
8
14
5
0
May
7.7
12
4
2
13
2
June
4.1
5
2
5
6
10
July
3.8
6
6
1
6
3
August
4.6
4
5
3
5
3
September
3.4
2
7
3
2
October
6.5
11
4
5
8
November
10.5
17
10
8
5
December
14.9
15
13
9
14
Average
7.5
8.4
6.7
5.9
7.8
7.0
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
7
10
6
8
7
February
7.4
8
6
10
6
10
March
7.4
6
8
6
7
8
April
6.8
7
7
8
7
4
May
6.4
5
7
6
9
7
June
5.9
6
6
5
5
7
July
5.8
5
6
6
6
6
August
5.3
5
6
5
6
5
September
5.3
5
5
5
5
October
5.8
6
5
5
7
November
6.1
9
6
5
5
December
6.9
8
4
6
6
Average
6.3
5.9
6.8
6.1
6.1
6.6
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
206°
202°
208°
206°
204°
February
200°
236°
210°
208°
215°
March
224°
214°
005°
255°
220°
April
224°
292°
346°
350°
353°
May
233°
011°
316°
214°
011°
June
285°
010°
286°
315°
273°
July
248°
228°
343°
261°
277°
August
297°
225°
005°
244°
239°
September
282°
226°
349°
276°
October
210°
207°
219°
210°
November
207°
199°
207°
224°
December
206°
014°
195°
192°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.