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
79.3
87
88
75
88
67
February
82.3
81
84
90
82
88
March
87.4
85
85
96
86
92
April
92.9
96
90
97
96
97
May
91.1
81
88
97
98
100
June
93.5
94
99
98
86
97
July
94.6
98
92
99
90
90
August
95.9
95
99
95
93
September
93.6
92
98
93
92
October
91.7
92
94
88
96
November
84.2
88
82
85
79
December
77.8
77
80
67
82
Average
90.0
89.4
89.9
93.9
89.0
90.7
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
6.8
7
8
7
6
8
February
8.1
10
8
9
7
10
March
10.0
11
10
12
9
10
April
13.1
13
12
13
10
16
May
17.0
18
16
18
14
18
June
21.0
19
24
21
21
21
July
21.9
21
21
23
21
20
August
22.3
21
25
20
24
September
19.6
22
20
21
20
October
15.7
17
17
15
14
November
10.7
11
12
10
12
December
7.9
9
5
8
8
Average
14.5
14.0
14.9
15.4
13.4
15.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
3.5
3
5
4
3
5
February
4.1
7
5
5
2
5
March
5.3
7
5
6
5
5
April
7.2
8
7
7
4
8
May
10.6
12
10
11
9
10
June
14.4
13
16
14
15
14
July
15.9
16
16
16
16
15
August
16.3
16
18
15
18
September
14.1
16
14
15
14
October
11.5
13
13
11
11
November
7.2
7
8
7
8
December
4.8
6
2
5
5
Average
9.5
9.4
10.0
10.0
8.8
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.0
15
14
8
12
6
February
11.5
19
2
13
10
19
March
11.8
21
20
3
9
9
April
6.1
13
8
4
6
5
May
6.4
16
5
4
9
2
June
5.3
9
2
7
9
6
July
5.7
10
7
2
6
8
August
5.8
8
2
7
7
September
8.5
6
15
2
9
October
10.9
14
5
14
18
November
14.8
27
17
14
8
December
14.5
20
11
15
19
Average
8.8
13.9
10.0
6.6
8.8
8.8
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
13.6
15
16
11
13
15
February
15.5
16
13
20
14
22
March
13.5
12
15
10
13
15
April
11.5
15
12
13
11
10
May
10.6
10
11
10
13
12
June
10.7
11
10
10
9
11
July
11.1
11
15
10
10
12
August
11.0
12
9
12
11
September
10.9
10
10
10
11
October
13.8
14
12
14
16
November
13.5
17
15
11
14
December
14.4
17
9
13
14
Average
12.2
12.4
13.0
11.3
11.5
13.1
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
225°
218°
233°
232°
224°
February
205°
251°
223°
150°
229°
March
185°
220°
083°
259°
249°
April
234°
346°
001°
349°
047°
May
264°
356°
272°
242°
337°
June
264°
359°
265°
333°
257°
July
239°
236°
282°
262°
256°
August
250°
348°
272°
240°
September
172°
255°
210°
265°
October
203°
199°
201°
203°
November
207°
181°
234°
198°
December
212°
120°
201°
191°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.