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
73.4
80
80
0
78
February
79.7
78
100
70
March
78.1
88
80
78
April
72.7
85
0
84
May
70.5
78
0
67
June
59.9
74
24
50
79
July
52.0
52
58
48
August
64.3
75
64
63
September
78.1
68
85
85
October
83.8
81
80
78
83
November
75.0
70
58
0
79
December
68.6
83
4
32
Average
63.5
82.9
73.5
45.1
10.3
73.3
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
2.4
1
4
1
2
February
4.2
3
3
3
March
4.8
3
5
5
April
5.7
5
6
6
May
7.0
6
7
7
June
8.2
10
4
11
9
July
10.4
15
0
11
August
11.5
13
0
12
September
9.1
11
0
11
October
6.5
9
0
0
9
November
5.3
6
0
0
6
December
3.0
3
0
3
Average
5.2
2.2
8.0
1.8
1.0
6.3
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
-1.2
-1
0
-3
-1
February
0.6
-1
0
1
March
1.1
0
1
1
April
1.9
1
2
2
May
3.4
3
3
4
June
5.1
6
2
9
7
July
6.9
9
0
9
August
8.4
9
0
9
September
6.2
7
0
7
October
3.8
5
0
0
5
November
2.3
2
0
0
2
December
-1.6
0
0
0
Average
2.3
-1.3
4.2
0.8
-1.3
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
27.6
50
31
0
36
February
30.2
43
12
57
March
27.9
40
32
22
April
17.8
26
0
28
May
21.8
24
0
43
June
15.2
18
19
0
7
July
18.1
25
5
9
August
16.6
15
22
28
September
21.4
29
14
30
October
27.6
23
36
22
30
November
33.0
42
28
0
30
December
34.4
51
52
10
Average
22.8
43.4
26.1
15.2
2.5
29.2
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
10.0
5
14
12
13
February
14.8
12
14
14
March
13.0
12
14
11
April
13.0
14
18
12
May
12.3
13
10
14
June
9.7
11
5
5
12
July
9.9
10
10
8
August
9.7
8
13
9
September
11.6
11
13
12
October
12.6
11
15
0
13
November
12.0
10
11
0
14
December
12.7
11
11
11
Average
11.2
10.5
11.1
11.1
9.4
12.1
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
342°
108°
242°
162°
February
224°
269°
134°
March
025°
220°
149°
April
018°
257°
134°
May
286°
001°
179°
June
269°
003°
045°
300°
July
280°
273°
114°
August
267°
284°
269°
September
278°
272°
272°
October
271°
267°
360°
289°
November
236°
293°
360°
253°
December
285°
110°
198°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.