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
96.4
92
97
99
94
98
February
94.7
87
99
95
89
97
March
95.4
89
99
99
92
90
April
97.4
98
97
99
99
99
May
96.0
97
97
97
96
June
90.2
97
43
97
100
July
82.0
97
11
97
100
August
96.7
100
99
97
99
September
97.2
96
99
99
99
October
96.0
100
98
99
92
November
96.8
100
100
98
97
December
96.7
97
97
100
94
Average
94.4
93.7
97.9
82.9
96.5
96.7
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
12.5
20
13
13
11
13
February
14.3
20
15
14
8
12
March
19.8
22
19
20
19
20
April
23.6
25
25
26
22
23
May
27.2
28
31
26
29
June
32.3
30
34
32
36
July
34.5
32
38
33
37
August
34.0
35
34
34
36
September
31.0
32
33
33
30
October
23.7
27
25
26
24
November
17.9
20
18
20
19
December
13.2
18
13
19
10
Average
23.7
22.6
24.7
25.9
23.6
24.0
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
-4.8
9
-2
-6
-2
-2
February
-2.0
9
-2
-1
-8
-2
March
2.9
10
2
0
3
4
April
6.4
9
6
7
5
6
May
12.2
13
13
12
12
June
17.6
16
19
18
19
July
19.6
18
22
19
20
August
19.1
20
19
19
19
September
15.3
16
16
16
12
October
8.2
11
14
9
5
November
2.8
10
6
2
3
December
-2.1
6
-2
0
-3
Average
8.3
9.1
9.2
9.5
7.8
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.5
0
5
3
1
3
February
2.5
0
0
6
6
3
March
2.3
0
2
2
5
3
April
2.5
2
1
1
0
2
May
2.1
6
0
1
1
June
1.7
4
2
3
1
July
1.6
3
2
2
2
August
1.7
1
2
2
1
September
2.7
5
0
1
2
October
4.6
0
9
3
2
November
0.9
0
0
0
2
December
1.8
7
0
0
6
Average
2.2
1.1
2.8
1.9
1.9
2.0
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
8.6
0
7
9
9
8
February
9.4
0
11
11
8
10
March
10.4
0
11
11
12
11
April
10.6
0
11
13
12
11
May
9.9
8
11
11
10
June
8.9
6
11
9
10
July
5.8
5
7
8
0
August
7.2
1
7
10
9
September
7.7
0
8
10
9
October
8.5
0
7
10
9
November
9.2
0
13
9
11
December
8.8
0
8
11
9
Average
7.8
6.1
9.5
10.1
8.8
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
360°
271°
285°
308°
275°
February
360°
266°
309°
014°
321°
March
360°
233°
292°
228°
212°
April
360°
223°
229°
236°
263°
May
178°
211°
157°
206°
June
171°
191°
179°
209°
July
173°
187°
180°
341°
August
194°
197°
184°
182°
September
067°
196°
210°
228°
October
360°
221°
243°
228°
November
360°
206°
265°
235°
December
360°
246°
245°
330°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.