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
68.9
74
0
52
87
85
February
64.2
89
5
36
79
85
March
87.8
89
89
82
86
88
April
85.3
60
81
95
90
83
May
92.9
88
97
93
98
June
91.7
97
65
92
96
July
92.3
95
98
92
83
August
90.4
88
94
95
77
September
94.6
99
89
98
96
October
89.8
93
97
94
88
November
84.9
83
65
98
91
December
84.8
89
72
90
91
Average
84.9
77.9
76.9
76.7
91.2
88.7
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
15.9
19
23
20
0
0
February
17.5
24
24
20
0
0
March
20.0
26
28
24
7
0
April
23.6
21
27
30
29
0
May
27.1
30
34
31
0
June
29.9
37
36
32
0
July
31.5
37
37
33
0
August
31.0
38
34
33
0
September
27.6
36
31
34
0
October
23.0
29
29
31
0
November
21.5
23
21
25
16
December
19.8
22
23
26
11
Average
23.7
22.3
29.5
28.2
23.3
2.3
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
6.3
8
10
7
0
0
February
8.1
12
11
5
0
0
March
11.2
15
16
10
3
0
April
13.9
12
17
22
17
0
May
16.0
21
23
20
0
June
19.1
24
23
23
0
July
15.4
24
22
23
0
August
13.9
23
24
21
0
September
13.6
23
19
21
0
October
12.1
18
17
19
0
November
10.5
13
13
12
7
December
9.1
10
15
15
2
Average
12.3
11.7
17.4
16.5
14.4
0.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
6
3
9
6
6
February
4.9
2
0
3
12
2
March
3.3
1
4
4
5
4
April
7.4
4
8
5
1
4
May
4.6
3
0
2
4
June
2.8
1
3
2
5
July
3.0
2
1
4
3
August
2.8
3
5
4
5
September
4.2
0
3
5
9
October
7.2
6
3
2
3
November
10.6
10
14
4
6
December
6.3
4
23
1
1
Average
5.0
3.1
3.5
6.0
3.9
4.3
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
9.3
10
10
9
6
10
February
9.2
11
12
11
3
11
March
11.0
10
11
11
12
12
April
10.8
8
10
14
11
10
May
11.0
8
13
12
11
June
10.2
11
10
9
10
July
9.6
10
11
8
11
August
9.5
10
10
8
9
September
8.2
7
6
8
10
October
8.9
9
9
9
8
November
8.5
8
9
8
8
December
8.5
7
8
10
8
Average
9.6
9.3
9.3
9.7
8.6
9.8
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
012°
054°
357°
037°
163°
February
106°
107°
025°
159°
122°
March
107°
111°
104°
111°
139°
April
128°
096°
124°
101°
115°
May
100°
139°
117°
145°
June
142°
135°
125°
140°
July
139°
142°
135°
166°
August
127°
123°
132°
154°
September
119°
079°
096°
041°
October
092°
098°
105°
111°
November
043°
043°
087°
109°
December
045°
113°
149°
215°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.