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
79.6
79
68
80
77
85
February
80.7
91
84
75
75
78
March
87.1
80
81
86
85
86
April
90.6
92
84
94
95
93
May
92.8
94
95
96
88
June
93.4
90
98
92
91
July
95.1
95
92
92
95
August
93.9
93
93
96
91
September
92.8
97
89
93
84
October
89.9
94
90
90
84
November
87.2
85
81
96
91
December
77.7
72
58
75
87
Average
88.6
84.7
87.2
87.5
89.0
88.1
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
11.8
11
13
11
11
13
February
15.4
16
12
15
13
13
March
18.3
20
18
19
19
19
April
22.1
22
22
22
22
22
May
26.0
24
28
25
24
June
29.0
27
31
29
28
July
31.0
32
32
30
32
August
30.0
31
29
30
29
September
27.9
28
27
27
25
October
22.9
23
22
23
23
November
16.6
17
18
16
19
December
13.1
14
12
17
12
Average
21.5
16.9
22.4
22.2
21.6
21.5
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
2.8
1
5
1
2
5
February
5.5
5
5
4
3
5
March
7.5
8
5
8
8
10
April
11.2
13
11
10
10
10
May
15.8
14
17
14
14
June
19.3
18
20
20
19
July
21.4
21
22
20
22
August
21.1
21
21
22
21
September
18.6
18
18
18
18
October
13.0
12
10
14
14
November
6.6
7
9
5
9
December
4.4
4
5
8
2
Average
11.7
6.6
12.3
12.3
12.0
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
10.8
18
16
3
9
16
February
10.2
7
22
4
12
18
March
9.3
15
13
8
9
13
April
8.8
11
19
4
5
9
May
7.0
7
7
6
7
June
5.0
10
2
4
4
July
2.7
1
2
6
4
August
4.3
6
4
2
4
September
4.1
2
11
0
8
October
5.4
1
5
6
6
November
7.2
9
13
2
2
December
12.4
21
16
2
7
Average
7.6
13.2
9.4
5.9
5.1
7.9
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
4.9
5
4
5
5
6
February
4.9
5
4
4
5
5
March
5.2
5
4
6
5
5
April
5.3
6
6
5
5
6
May
4.6
5
5
5
5
June
4.0
4
4
4
5
July
3.6
3
4
3
3
August
3.4
4
3
3
3
September
3.9
3
4
3
5
October
4.0
4
4
4
3
November
4.0
4
4
4
5
December
4.1
4
3
3
4
Average
4.4
5.2
4.1
4.3
4.0
4.4
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
286°
284°
298°
274°
285°
February
287°
272°
308°
332°
280°
March
348°
295°
279°
056°
281°
April
268°
342°
277°
288°
277°
May
038°
276°
293°
316°
June
321°
014°
261°
270°
July
284°
263°
263°
312°
August
315°
306°
351°
282°
September
063°
030°
023°
054°
October
283°
356°
311°
028°
November
038°
027°
299°
358°
December
296°
063°
254°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.