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
80.1
80
80
86
65
72
February
72.3
77
58
70
74
72
March
61.4
65
53
54
79
9
April
74.4
69
57
86
65
May
82.8
79
86
79
79
June
75.9
69
59
77
86
July
68.1
54
72
63
73
August
77.8
64
72
83
87
September
86.0
91
79
93
90
October
88.5
80
85
88
96
November
76.6
74
58
80
79
December
71.4
48
65
64
92
Average
76.3
72.9
67.5
69.5
78.0
74.9
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
1.7
3
3
2
1
-1
February
2.8
3
3
4
0
3
March
2.6
1
3
3
0
3
April
4.9
4
4
6
6
May
7.7
7
9
8
9
June
11.0
10
12
11
11
July
13.3
13
13
13
14
August
13.9
13
13
13
14
September
11.7
11
11
11
12
October
8.5
9
8
7
9
November
5.5
6
6
1
5
December
3.0
1
5
4
2
Average
6.6
2.4
6.9
7.4
6.2
7.2
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
-4.8
-3
-3
-3
-2
-7
February
-2.9
-1
-2
-1
0
-2
March
-2.2
-4
-1
-2
0
-2
April
0.4
-2
0
1
1
May
2.9
2
2
4
4
June
6.3
6
6
7
7
July
8.5
9
8
8
9
August
9.4
9
9
10
10
September
7.3
7
7
7
6
October
4.5
5
4
3
4
November
1.4
2
2
-4
1
December
-2.7
-3
2
0
-2
Average
2.1
-3.2
2.4
2.8
2.8
2.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
35.0
38
36
30
38
41
February
40.3
50
62
35
13
35
March
37.1
54
60
64
28
6
April
34.4
45
47
26
24
May
35.1
44
18
39
31
June
30.2
43
22
30
31
July
30.6
49
20
34
24
August
30.8
41
36
31
19
September
36.1
34
41
35
33
October
38.1
39
44
45
32
November
48.8
53
59
48
47
December
40.2
60
50
25
21
Average
36.3
48.2
47.0
38.4
33.2
27.8
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
12.2
11
12
13
15
11
February
12.0
14
13
11
15
12
March
12.1
13
14
15
12
13
April
12.4
12
14
13
11
May
11.4
12
14
13
11
June
10.7
10
12
11
10
July
10.6
12
11
11
10
August
10.8
11
11
10
12
September
11.5
12
11
11
12
October
12.7
12
14
18
11
November
12.8
10
14
12
14
December
11.9
13
12
13
12
Average
11.7
12.5
11.8
12.7
12.5
11.3
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
287°
286°
022°
341°
291°
February
261°
259°
135°
058°
211°
March
336°
284°
304°
250°
281°
April
331°
071°
287°
066°
May
329°
273°
072°
085°
June
158°
180°
063°
244°
July
239°
244°
243°
242°
August
193°
245°
252°
241°
September
275°
245°
265°
358°
October
052°
262°
268°
333°
November
264°
264°
293°
324°
December
303°
062°
246°
009°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.