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
88.0
86
89
92
88
89
February
87.6
94
93
91
79
86
March
90.4
90
88
91
87
91
April
93.7
93
94
95
93
May
88.8
94
88
97
91
June
91.3
87
94
90
92
July
94.5
95
93
96
96
August
92.6
95
94
93
89
September
88.6
94
92
95
89
October
89.2
95
89
91
83
November
92.9
96
90
99
92
December
87.6
81
86
94
90
Average
90.5
89.9
91.7
91.5
92.2
90.2
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
8.0
8
11
5
7
10
February
11.9
12
14
13
7
12
March
15.2
17
15
17
17
18
April
21.0
24
20
21
19
May
24.6
23
25
25
22
June
29.0
28
29
30
29
July
31.7
32
30
32
33
August
30.6
31
31
32
30
September
26.8
28
27
27
25
October
21.8
23
20
23
22
November
14.8
16
17
14
18
December
10.5
11
9
14
10
Average
19.7
12.4
21.3
20.5
20.9
20.7
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
-3.8
-2
0
-4
-3
-1
February
0.1
-1
2
-2
-1
1
March
2.3
4
2
3
3
5
April
7.3
8
6
7
6
May
12.2
10
13
10
12
June
16.8
14
17
17
17
July
19.6
20
19
20
21
August
19.1
19
19
20
20
September
15.2
15
15
16
14
October
9.0
8
7
13
9
November
1.7
-1
3
1
4
December
-1.2
0
-1
1
-1
Average
7.5
0.2
8.0
8.2
8.5
9.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.9
15
11
9
6
7
February
9.3
8
9
9
11
13
March
8.4
11
9
8
8
8
April
8.7
9
7
5
9
May
7.4
5
9
5
5
June
5.3
6
4
6
4
July
3.9
2
6
2
4
August
5.1
4
5
6
11
September
7.1
8
5
4
6
October
6.8
4
9
5
11
November
6.7
5
7
3
8
December
7.0
8
10
1
9
Average
7.4
11.4
6.3
7.0
5.0
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
4.5
4
4
5
4
4
February
4.6
4
5
5
5
5
March
5.6
5
5
6
5
5
April
4.9
4
5
4
6
May
3.7
3
3
4
5
June
3.5
3
3
4
3
July
2.9
3
3
3
3
August
2.7
3
2
2
3
September
3.2
4
3
3
3
October
3.6
3
4
3
4
November
3.6
4
4
3
4
December
3.4
2
4
3
4
Average
3.9
4.3
3.5
3.9
3.6
4.0
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
300°
293°
318°
328°
315°
February
284°
263°
254°
323°
257°
March
307°
292°
246°
303°
247°
April
236°
279°
287°
303°
May
344°
357°
321°
296°
June
322°
284°
209°
252°
July
252°
224°
255°
302°
August
264°
232°
261°
226°
September
347°
328°
262°
339°
October
299°
335°
298°
288°
November
316°
274°
312°
244°
December
288°
292°
222°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.