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
84.0
50
76
79
92
83
February
85.0
80
82
71
90
83
March
88.5
93
86
85
86
94
April
91.5
88
94
92
81
May
91.7
92
91
92
98
June
88.2
84
84
86
89
July
83.9
77
79
94
90
August
83.5
84
76
84
83
September
86.9
91
86
89
87
October
86.2
88
82
94
91
November
87.1
86
91
88
92
December
87.1
92
89
84
79
Average
87.8
92.0
85.0
83.7
89.2
87.8
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
1.8
1
4
0
4
-1
February
2.1
-1
2
4
1
3
March
4.7
7
4
5
3
4
April
9.0
8
8
9
8
May
13.5
14
14
11
15
June
16.2
16
18
17
15
July
17.7
19
17
18
18
August
17.1
18
17
17
16
September
14.4
14
14
13
14
October
9.0
10
10
7
8
November
4.1
6
3
4
3
December
1.8
2
0
-3
4
Average
8.9
5.7
10.1
9.5
8.4
8.9
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
-4.3
1
0
-5
-1
-8
February
-5.1
-1
-4
-1
-8
-1
March
-3.3
-2
-4
0
-2
-4
April
0.2
1
-1
0
0
May
4.5
5
3
5
4
June
8.4
8
9
9
8
July
10.6
11
11
10
11
August
10.8
11
12
11
11
September
7.0
9
9
8
6
October
3.2
4
5
2
2
November
-1.0
2
-2
-1
-3
December
-4.9
0
-7
-10
1
Average
2.1
-2.6
3.7
2.9
1.8
2.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
31.1
0
35
35
45
30
February
30.2
40
37
50
23
48
March
26.8
28
30
38
34
23
April
26.9
38
25
30
31
May
21.4
23
16
34
9
June
19.3
20
15
21
27
July
16.9
9
34
8
20
August
22.7
18
27
25
30
September
27.1
40
33
40
22
October
35.6
37
36
41
32
November
33.8
38
34
40
28
December
33.5
33
33
28
43
Average
26.1
27.6
27.6
30.1
29.6
27.3
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
5.2
3
5
5
6
5
February
5.5
4
5
6
6
7
March
6.1
6
7
5
6
6
April
5.9
6
6
6
5
May
5.1
5
5
5
4
June
4.2
4
4
4
5
July
3.7
3
4
3
5
August
4.3
4
4
5
5
September
4.5
6
5
5
4
October
5.8
6
6
7
5
November
5.9
7
7
6
7
December
5.9
3
6
5
8
Average
5.2
5.9
5.0
5.1
5.2
5.3
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
296°
128°
060°
117°
057°
February
111°
123°
135°
125°
127°
March
159°
096°
130°
101°
041°
April
136°
105°
134°
153°
May
178°
186°
182°
202°
June
211°
199°
228°
219°
July
221°
170°
205°
177°
August
175°
166°
152°
149°
September
128°
133°
128°
128°
October
097°
133°
125°
113°
November
127°
080°
128°
098°
December
103°
083°
360°
131°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.