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
64.6
82
58
68
85
0
February
62.6
67
65
76
73
0
March
62.3
49
76
72
79
0
April
53.4
0
77
70
74
0
May
52.4
0
75
57
77
0
June
44.2
33
39
50
51
0
July
36.4
29
27
54
55
0
August
54.7
52
63
57
39
0
September
67.9
85
52
82
35
61
October
73.5
67
76
54
82
73
November
82.3
92
82
85
75
December
65.5
67
50
88
74
Average
57.8
44.8
60.4
62.9
66.3
20.4
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
4.1
3
7
4
4
4
February
3.2
3
3
4
4
3
March
3.8
5
3
5
5
4
April
6.6
6
6
7
7
6
May
9.8
10
9
10
11
10
June
11.3
15
14
15
3
5
July
14.4
19
21
20
2
0
August
16.1
22
21
22
0
0
September
16.6
20
20
20
0
19
October
14.5
15
16
16
12
15
November
10.6
9
12
12
11
December
6.0
7
7
7
8
Average
9.9
11.8
11.4
12.0
5.4
7.0
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
-1.1
-1
2
-2
0
-1
February
-2.1
-1
-3
-1
0
-2
March
-1.4
1
0
0
-1
-1
April
2.3
3
3
3
2
2
May
4.6
6
5
4
3
5
June
7.1
10
9
11
0
1
July
11.0
16
16
15
0
0
August
13.0
17
17
18
0
0
September
12.6
15
15
15
0
14
October
10.1
10
11
11
9
10
November
5.3
4
6
6
6
December
1.6
3
4
1
4
Average
5.5
7.6
6.9
7.0
1.7
3.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
24.5
29
38
30
14
0
February
31.9
37
53
35
25
0
March
20.7
26
25
29
17
0
April
11.8
0
20
7
17
0
May
9.4
0
23
3
5
0
June
15.3
19
36
9
0
0
July
20.8
34
32
16
0
0
August
7.5
8
18
8
0
0
September
6.2
10
5
10
0
13
October
13.3
9
23
18
9
12
November
16.0
18
19
13
19
December
19.5
28
29
14
21
Average
15.0
18.9
27.1
16.2
8.1
4.5
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
16.0
16
16
17
16
15
February
15.7
9
18
19
18
15
March
15.9
13
16
16
16
17
April
14.7
12
14
14
17
17
May
12.9
10
15
12
13
16
June
10.2
11
11
11
12
3
July
8.6
9
10
10
10
0
August
7.4
0
10
10
10
0
September
8.8
0
10
12
11
12
October
12.8
15
13
10
12
13
November
16.0
14
18
16
15
December
16.8
15
20
18
17
Average
12.4
9.1
13.2
13.3
13.4
10.7
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
321°
274°
257°
344°
285°
February
248°
309°
252°
285°
257°
March
205°
338°
244°
259°
320°
April
019°
329°
237°
016°
339°
May
087°
181°
017°
225°
227°
June
216°
166°
182°
207°
241°
July
213°
179°
217°
207°
360°
August
360°
184°
201°
216°
360°
September
360°
167°
307°
217°
173°
October
267°
236°
091°
342°
360°
November
294°
266°
220°
238°
December
289°
038°
272°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.