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
91.3
78
94
94
96
92
February
90.8
99
97
90
83
97
March
94.3
94
97
97
98
82
April
94.3
96
98
98
94
95
May
91.0
92
91
89
94
June
97.7
99
97
96
99
July
99.4
100
100
100
99
August
98.4
100
97
99
99
September
96.0
95
100
99
93
October
93.9
92
100
97
87
November
90.6
79
89
93
93
December
91.1
91
79
98
94
Average
94.0
91.5
94.4
94.8
95.2
93.7
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
12.5
10
15
13
11
14
February
14.1
18
16
14
7
13
March
20.3
20
18
21
21
21
April
24.4
26
24
28
22
24
May
29.3
29
33
26
30
June
33.5
33
35
32
34
July
36.4
37
40
33
36
August
35.6
39
36
34
36
September
31.8
35
34
34
29
October
24.3
26
26
27
24
November
18.1
19
16
20
20
December
14.6
15
14
21
15
Average
23.9
18.2
25.5
26.2
24.3
24.5
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
-2.0
-2
0
-5
-1
0
February
-1.4
3
0
-4
-5
0
March
4.8
5
4
2
5
7
April
8.3
11
7
10
7
8
May
15.1
16
16
15
14
June
19.4
19
20
19
20
July
21.8
22
24
21
23
August
21.1
22
22
21
20
September
17.9
20
18
17
15
October
9.9
11
10
12
8
November
3.3
5
4
4
5
December
0.6
3
3
2
-1
Average
9.3
4.2
10.6
10.2
9.9
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.6
8
8
3
2
5
February
5.9
9
6
9
8
5
March
3.9
6
6
5
1
8
April
3.4
3
5
1
3
1
May
3.0
7
3
4
1
June
2.6
4
3
5
1
July
1.7
3
1
3
2
August
2.5
0
8
1
1
September
3.7
7
2
0
5
October
6.3
10
13
0
4
November
3.5
3
11
1
2
December
3.0
5
6
1
4
Average
3.9
6.3
5.2
5.3
2.3
3.1
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
10.0
9
11
10
11
10
February
10.9
12
12
11
12
10
March
11.6
10
13
13
13
10
April
12.6
13
12
15
12
12
May
10.9
9
13
11
11
June
10.5
10
11
9
12
July
8.3
9
9
7
10
August
8.3
8
8
9
8
September
8.8
9
9
9
8
October
10.2
11
10
11
10
November
9.8
9
11
10
10
December
9.3
9
9
10
10
Average
10.2
10.9
10.0
10.8
10.2
9.9
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
014°
279°
002°
326°
042°
February
292°
245°
355°
028°
341°
March
133°
056°
335°
167°
096°
April
140°
124°
142°
103°
130°
May
127°
162°
130°
120°
June
101°
146°
155°
180°
July
162°
165°
153°
161°
August
130°
148°
166°
157°
September
141°
160°
156°
112°
October
139°
112°
165°
126°
November
154°
117°
164°
170°
December
196°
199°
215°
332°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.