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
95.5
91
94
97
98
98
February
95.5
91
96
95
96
99
March
92.1
91
91
93
85
96
April
90.6
82
92
85
95
95
May
82.8
68
83
78
94
85
June
86.0
90
87
77
83
90
July
86.9
83
84
81
91
93
August
88.6
97
84
82
96
September
84.2
70
85
89
93
October
90.4
91
89
95
93
November
93.3
84
95
93
95
December
95.3
89
94
97
97
Average
90.6
85.5
88.1
88.1
91.7
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
31.4
29
34
35
31
31
February
30.8
31
33
32
29
31
March
29.1
29
32
28
28
32
April
25.3
24
25
25
27
26
May
19.7
17
20
18
20
21
June
18.2
20
18
16
17
19
July
17.8
17
17
20
19
17
August
20.0
21
19
20
21
September
20.9
20
21
21
20
October
23.8
23
24
25
23
November
27.1
26
28
27
27
December
29.8
28
32
31
29
Average
24.5
23.8
24.9
24.3
24.4
24.6
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
17.8
18
11
15
18
18
February
16.6
20
10
9
17
17
March
15.1
17
8
9
16
17
April
12.3
15
6
2
14
12
May
9.3
10
4
3
8
10
June
8.3
12
2
1
8
10
July
7.3
6
5
5
7
6
August
9.4
9
5
9
9
September
10.9
11
3
13
9
October
11.4
12
5
10
11
November
14.0
15
9
9
15
December
15.7
17
9
11
16
Average
12.8
13.9
9.1
6.0
11.4
12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.2
3
5
4
3
4
February
4.4
3
3
10
6
3
March
4.1
4
8
4
3
2
April
5.5
14
1
9
4
3
May
13.0
30
19
11
5
11
June
9.3
6
5
13
7
12
July
9.7
6
15
16
3
7
August
8.6
3
10
13
2
September
13.1
27
8
12
9
October
7.6
4
9
5
6
November
6.2
19
3
7
1
December
3.6
5
2
3
3
Average
7.2
8.6
9.3
8.0
5.6
4.8
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
8.4
9
8
9
9
8
February
7.5
8
8
8
7
8
March
7.5
7
7
8
7
8
April
7.8
8
7
7
8
9
May
7.7
9
7
7
7
9
June
8.1
11
6
7
8
9
July
8.3
7
9
9
8
9
August
8.4
9
8
8
8
September
9.2
10
9
10
9
October
9.0
9
10
8
9
November
8.8
9
9
9
9
December
8.6
9
9
9
9
Average
8.2
8.3
8.1
8.3
8.1
8.6
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
103°
122°
112°
087°
101°
February
099°
228°
165°
146°
111°
March
094°
092°
209°
125°
088°
April
102°
110°
082°
067°
217°
May
145°
079°
178°
278°
274°
June
022°
137°
164°
290°
008°
July
115°
097°
050°
314°
308°
August
357°
087°
070°
042°
September
103°
122°
076°
102°
October
105°
137°
106°
114°
November
090°
086°
127°
107°
December
109°
123°
111°
112°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.