Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
78.2
75
79
60
90
96
February
85.3
83
93
78
89
83
March
92.3
95
89
94
93
90
April
94.7
96
95
99
93
May
96.3
99
95
98
100
June
98.0
100
95
99
98
July
99.2
98
98
100
100
August
97.2
96
96
100
99
September
89.1
95
96
96
63
October
83.4
82
74
90
80
November
77.2
61
74
82
86
December
76.0
61
76
84
80
Average
89.2
84.5
88.3
87.0
93.9
89.5
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi 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
9.4
9
9
10
10
11
February
10.0
12
10
11
10
11
March
13.2
14
11
15
14
14
April
16.8
16
15
20
19
May
21.6
24
19
22
21
June
25.5
28
24
29
24
July
30.5
32
31
32
30
August
30.9
32
32
31
31
September
25.6
26
27
27
26
October
18.7
19
22
17
19
November
12.0
13
10
14
12
December
8.8
11
7
8
10
Average
17.8
11.7
19.1
19.0
19.5
19.0
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
2.6
2
2
3
4
6
February
2.1
5
0
2
4
2
March
3.1
4
2
6
2
3
April
5.4
6
4
4
6
May
7.9
9
7
7
8
June
10.4
10
11
12
11
July
12.1
13
14
13
13
August
13.1
15
14
14
12
September
10.8
11
12
11
12
October
6.5
8
8
8
7
November
3.8
5
1
7
4
December
2.5
6
1
3
3
Average
6.3
3.3
7.2
6.9
7.3
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.9
35
15
14
15
20
February
17.1
21
14
7
16
8
March
16.0
18
22
13
9
12
April
14.8
19
18
4
9
May
7.2
3
14
4
11
June
5.2
2
12
6
8
July
0.9
2
1
1
0
August
1.2
4
0
0
1
September
4.9
7
1
5
2
October
7.3
10
5
13
3
November
12.6
11
17
9
10
December
16.7
19
14
30
18
Average
11.3
24.6
10.1
9.3
8.6
8.1
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
6.6
6
7
6
6
9
February
6.9
6
7
6
7
6
March
6.9
8
8
6
7
7
April
6.9
8
7
7
6
May
5.8
6
6
7
6
June
6.5
7
6
7
6
July
6.3
6
6
7
6
August
6.3
6
6
7
8
September
6.5
7
7
7
6
October
6.0
6
5
7
6
November
6.0
5
7
6
6
December
6.0
5
6
8
6
Average
6.5
7.0
6.3
6.0
6.8
6.4
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
169°
178°
166°
169°
187°
February
161°
209°
246°
212°
222°
March
147°
206°
236°
223°
254°
April
211°
224°
346°
312°
May
345°
236°
336°
287°
June
349°
315°
317°
316°
July
341°
357°
005°
359°
August
304°
335°
354°
360°
September
296°
340°
346°
349°
October
280°
245°
198°
347°
November
154°
198°
193°
195°
December
131°
174°
193°
171°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.