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
87.7
73
96
88
94
90
February
87.3
96
94
80
79
86
March
88.2
84
94
84
89
85
April
92.2
84
94
96
94
May
89.3
96
86
96
93
June
94.7
86
96
97
96
July
97.0
96
98
98
95
August
96.7
95
97
97
95
September
93.9
90
95
98
96
October
89.1
94
84
94
82
November
95.5
98
93
100
94
December
86.5
74
80
93
95
Average
91.0
84.0
91.4
90.3
94.5
92.1
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
6.4
6
10
5
6
8
February
9.1
9
11
10
4
10
March
12.3
14
12
14
14
15
April
18.3
20
18
18
16
May
23.3
23
25
24
21
June
28.1
27
29
29
29
July
31.2
31
32
31
32
August
29.8
29
32
30
30
September
26.3
26
27
26
25
October
20.4
21
19
22
20
November
13.3
13
15
13
16
December
8.6
10
8
12
8
Average
17.8
9.6
19.4
19.8
19.1
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
-1.4
0
3
-3
-1
1
February
0.6
1
2
0
-1
1
March
3.1
5
3
4
4
5
April
8.4
10
8
8
7
May
13.4
12
15
13
12
June
18.5
17
19
19
19
July
22.5
22
24
22
23
August
21.5
21
23
22
22
September
17.8
18
18
18
17
October
12.2
12
10
14
12
November
4.5
4
6
4
7
December
1.6
3
2
4
1
Average
9.3
1.8
10.5
10.8
10.6
10.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.7
23
14
17
7
5
February
15.3
9
9
20
26
16
March
12.8
16
12
16
10
11
April
8.7
11
11
5
11
May
9.9
6
15
8
6
June
5.0
7
6
5
2
July
4.7
6
5
2
5
August
5.3
5
1
5
9
September
7.9
15
9
5
4
October
9.9
5
16
6
12
November
7.2
6
11
5
7
December
14.1
18
28
3
11
Average
9.9
16.1
9.1
11.6
6.8
7.7
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
9.4
9
9
10
10
9
February
9.0
8
9
9
9
9
March
10.5
10
11
11
10
9
April
10.2
9
10
10
12
May
8.5
8
8
8
10
June
8.2
8
8
8
8
July
7.2
7
8
7
7
August
7.4
8
8
7
8
September
7.8
8
8
9
7
October
8.3
8
8
9
8
November
8.9
8
9
9
9
December
8.4
7
9
7
10
Average
8.7
9.1
8.2
8.7
8.5
8.7
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
297°
287°
300°
313°
296°
February
297°
271°
276°
328°
266°
March
307°
299°
278°
286°
304°
April
267°
295°
290°
297°
May
293°
069°
300°
295°
June
312°
258°
222°
263°
July
228°
234°
239°
240°
August
255°
232°
224°
232°
September
017°
291°
271°
026°
October
291°
339°
289°
303°
November
293°
275°
289°
260°
December
289°
308°
266°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.