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
85.6
94
95
87
81
89
February
88.9
86
94
97
85
93
March
87.4
80
90
88
85
97
April
91.7
95
86
99
97
95
May
90.6
84
91
98
91
97
June
90.2
98
97
97
92
79
July
93.8
93
95
99
88
94
August
93.5
99
94
94
94
81
September
92.9
89
94
95
96
October
89.8
85
93
94
86
November
84.0
93
77
91
81
December
80.6
87
79
70
72
Average
90.1
91.3
91.5
93.5
89.8
89.0
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
7.6
8
9
8
6
10
February
9.4
11
10
10
8
10
March
11.1
12
11
12
12
11
April
13.0
13
13
13
11
15
May
16.9
18
17
18
15
18
June
19.8
19
21
21
20
19
July
22.0
21
21
24
22
20
August
21.9
22
21
24
21
21
September
19.2
21
19
20
19
October
15.1
16
17
16
14
November
10.8
11
12
11
12
December
8.0
9
5
9
8
Average
14.7
15.5
14.9
15.6
14.2
14.6
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
2.5
2
3
2
1
4
February
3.6
5
5
4
3
4
March
4.1
5
4
4
5
3
April
4.7
6
5
5
1
6
May
8.3
10
9
9
6
7
June
11.1
10
12
11
12
11
July
13.1
12
13
14
14
13
August
12.9
12
13
13
13
14
September
11.0
13
11
12
10
October
8.5
9
10
9
8
November
5.3
5
7
6
6
December
3.3
5
1
4
3
Average
7.4
8.0
7.9
7.6
7.1
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.7
10
10
5
18
9
February
15.5
19
5
20
15
18
March
14.5
20
18
12
10
10
April
8.6
19
12
3
3
4
May
9.6
13
7
10
16
2
June
10.6
7
3
7
9
19
July
9.5
12
16
5
6
15
August
7.7
5
10
5
8
10
September
10.0
13
6
9
8
October
16.1
20
13
12
22
November
15.0
15
15
9
13
December
18.1
26
11
24
19
Average
11.4
12.6
12.1
8.5
10.6
11.8
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
11.6
12
13
11
10
14
February
13.2
12
12
17
12
18
March
12.2
12
12
10
12
13
April
10.5
13
10
10
9
10
May
9.2
9
8
10
9
10
June
9.2
9
9
9
8
10
July
9.0
9
11
9
7
10
August
10.4
12
10
9
9
12
September
10.1
10
9
9
11
October
11.6
10
12
13
11
November
11.0
11
11
11
12
December
11.0
14
8
10
10
Average
10.5
10.7
10.5
10.2
9.6
11.4
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
233°
233°
242°
227°
213°
February
227°
253°
237°
162°
228°
March
180°
228°
125°
242°
221°
April
246°
153°
006°
017°
089°
May
080°
058°
237°
201°
270°
June
254°
071°
214°
027°
204°
July
240°
230°
226°
192°
239°
August
224°
239°
239°
254°
243°
September
200°
278°
215°
246°
October
213°
210°
218°
213°
November
247°
195°
255°
209°
December
225°
234°
219°
202°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.