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
92.2
92
86
92
94
92
February
92.2
93
89
96
87
90
March
95.8
86
98
98
94
99
April
97.4
97
96
99
97
96
May
97.8
97
96
100
99
99
June
99.5
99
99
100
99
100
July
99.8
99
100
100
100
100
August
99.4
100
98
100
99
99
September
99.2
100
99
100
98
October
96.9
98
94
99
97
November
93.8
96
94
92
94
December
91.7
93
81
93
91
Average
96.6
95.9
95.9
96.8
96.4
96.5
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
13.0
15
13
13
12
14
February
15.4
17
15
16
16
17
March
17.1
18
18
16
16
17
April
20.0
22
19
19
18
20
May
24.2
24
24
27
23
26
June
30.4
30
29
33
30
28
July
33.4
35
34
35
32
33
August
33.5
35
33
34
33
33
September
28.5
30
28
30
29
October
23.8
27
25
22
21
November
17.9
19
19
18
19
December
14.0
15
15
14
14
Average
22.8
24.7
22.9
23.6
22.0
22.4
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
3.6
6
5
3
4
2
February
5.2
6
3
5
6
6
March
7.8
10
9
5
7
7
April
10.6
11
10
10
11
11
May
16.3
16
16
17
17
18
June
21.8
22
20
23
23
21
July
24.3
25
24
25
25
25
August
23.0
25
22
24
23
25
September
18.1
18
18
19
19
October
13.3
15
14
13
12
November
9.7
10
10
11
9
December
5.6
7
8
5
5
Average
13.5
15.1
13.3
13.4
13.6
13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
5
9
3
12
3
February
4.8
5
3
3
5
0
March
5.9
9
3
6
6
4
April
4.7
3
7
5
7
4
May
4.6
5
8
2
4
1
June
1.2
2
1
1
2
2
July
0.4
1
1
0
1
0
August
1.1
1
1
1
1
3
September
2.2
1
5
0
6
October
2.3
1
1
3
4
November
7.3
6
5
14
2
December
9.0
4
20
10
10
Average
3.8
3.4
3.6
3.6
5.1
3.1
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
4.9
5
5
5
6
3
February
5.3
5
4
6
5
5
March
6.2
6
6
6
6
6
April
5.9
6
6
7
6
5
May
5.8
6
5
5
7
7
June
6.1
7
6
6
6
7
July
6.4
7
6
7
7
6
August
6.1
6
6
6
7
7
September
5.4
6
7
5
5
October
5.0
5
4
6
5
November
4.9
5
5
5
4
December
4.8
5
5
5
5
Average
5.7
6.0
5.4
5.7
5.9
5.4
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
358°
348°
011°
094°
020°
February
167°
342°
337°
325°
301°
March
188°
213°
326°
331°
275°
April
233°
319°
251°
226°
256°
May
235°
265°
249°
221°
257°
June
234°
261°
262°
243°
227°
July
237°
230°
249°
233°
255°
August
242°
237°
244°
232°
233°
September
302°
218°
242°
245°
October
208°
276°
358°
215°
November
278°
344°
085°
015°
December
004°
142°
015°
174°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.