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
93.3
96
91
82
90
95
February
90.1
85
88
89
88
87
March
96.1
98
91
96
99
97
April
96.9
96
100
97
98
May
91.8
88
92
97
96
June
92.2
89
83
92
97
July
89.1
85
88
90
94
August
77.7
82
63
89
86
September
77.5
80
62
90
71
October
80.2
82
64
90
68
November
91.6
89
81
96
97
December
90.1
81
88
92
95
Average
89.4
92.9
86.6
81.8
92.5
90.0
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
6.5
7
7
6
7
6
February
6.0
7
6
8
5
7
March
8.7
9
9
9
9
8
April
11.1
10
10
12
12
May
14.7
16
13
13
16
June
16.8
17
16
19
16
July
18.5
19
19
18
18
August
19.2
20
20
19
19
September
16.5
16
17
16
18
October
12.2
13
14
11
12
November
8.3
9
6
9
8
December
5.8
8
3
3
7
Average
11.5
7.6
12.6
12.0
11.7
12.2
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
2.2
3
4
2
2
1
February
0.7
2
2
2
1
2
March
1.5
2
1
3
3
1
April
3.3
3
2
3
4
May
6.4
7
6
6
8
June
8.9
8
9
10
10
July
10.7
11
12
11
11
August
11.3
12
12
11
11
September
9.3
8
9
10
11
October
6.0
6
8
6
7
November
3.5
4
1
4
4
December
1.5
4
-2
-1
3
Average
5.0
2.1
5.6
5.5
5.4
5.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
30.3
34
23
34
27
38
February
30.2
35
49
25
32
31
March
23.4
25
20
33
22
24
April
23.5
39
25
17
11
May
16.0
8
33
19
12
June
17.0
9
23
13
25
July
9.1
14
11
7
11
August
11.6
11
11
14
18
September
18.1
25
6
28
13
October
24.9
23
17
29
38
November
32.7
29
30
47
37
December
31.0
45
22
31
24
Average
22.2
31.0
22.9
21.5
22.4
22.2
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
10.2
12
11
9
9
11
February
8.4
8
11
8
9
8
March
7.6
8
8
9
9
7
April
7.7
9
9
6
6
May
6.4
6
7
6
7
June
6.2
7
6
6
7
July
5.4
5
5
6
6
August
5.2
5
5
6
6
September
5.3
6
4
7
5
October
6.7
7
5
9
7
November
8.6
8
8
10
10
December
8.7
10
8
7
11
Average
7.2
8.9
7.4
6.5
7.3
7.2
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
112°
114°
120°
117°
120°
February
106°
116°
112°
127°
129°
March
096°
108°
113°
112°
104°
April
115°
116°
010°
034°
May
348°
090°
029°
047°
June
346°
039°
055°
012°
July
022°
022°
002°
001°
August
015°
017°
344°
028°
September
071°
035°
101°
079°
October
100°
062°
112°
098°
November
127°
113°
126°
125°
December
119°
110°
143°
118°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.