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
74.4
37
78
51
77
76
February
66.0
36
67
70
42
75
March
74.3
72
60
65
76
74
April
68.7
85
74
68
27
May
65.1
61
66
29
June
48.7
26
54
37
July
42.9
46
46
38
August
59.9
58
68
61
September
74.5
76
89
83
October
87.7
89
94
November
74.2
55
81
December
78.2
57
45
90
Average
63.4
45.2
68.2
58.5
61.9
59.9
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
1.6
1
3
2
2
1
February
2.9
2
3
2
5
3
March
2.9
1
3
0
4
4
April
4.1
1
1
6
5
May
5.9
1
7
8
June
7.9
1
9
10
July
9.3
0
11
12
August
10.5
0
12
13
September
11.0
10
12
11
October
8.4
7
8
November
6.0
4
6
December
3.5
5
5
3
Average
5.1
1.4
2.7
2.5
7.1
6.8
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
-2.9
-1
0
-1
0
-3
February
0.0
0
0
-1
2
0
March
-1.9
-2
0
0
0
0
April
1.4
-1
0
2
2
May
3.0
0
4
4
June
5.2
0
6
7
July
6.8
0
8
9
August
7.5
0
9
9
September
7.7
7
8
7
October
5.1
4
5
November
3.1
2
3
December
0.6
2
3
0
Average
2.3
-1.0
-1.9
0.8
3.9
3.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.9
4
22
25
0
10
February
18.2
15
40
21
16
2
March
14.0
43
31
22
0
1
April
11.7
39
22
0
0
May
9.4
12
0
0
June
8.1
11
0
0
July
6.0
4
0
0
August
7.6
15
0
0
September
11.3
12
0
0
October
16.2
20
0
November
12.4
28
0
December
15.4
41
24
0
Average
14.1
19.5
31.1
17.3
2.2
0.8
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
13.7
18
14
6
17
9
February
15.0
18
17
5
19
14
March
13.6
16
17
7
17
12
April
12.8
19
4
15
14
May
11.0
3
13
13
June
11.7
12
12
13
July
11.0
10
9
11
August
10.7
13
9
10
September
11.6
14
9
11
October
14.5
17
12
November
15.8
14
16
December
15.8
18
13
15
Average
13.6
17.4
16.0
9.7
13.0
12.2
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
020°
125°
064°
270°
298°
February
241°
199°
176°
144°
178°
March
054°
271°
337°
253°
127°
April
317°
162°
063°
129°
May
331°
105°
153°
June
176°
109°
309°
July
302°
203°
176°
August
299°
160°
238°
September
256°
272°
292°
October
275°
242°
November
297°
246°
December
096°
209°
144°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.