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
84.9
74
80
92
89
80
February
81.5
93
86
87
75
82
March
86.0
82
85
96
93
79
April
87.2
88
88
85
76
May
87.8
87
86
86
83
June
91.0
72
94
93
91
July
90.1
99
99
93
82
August
93.7
99
88
95
84
September
90.6
97
96
97
72
October
81.9
90
97
95
47
November
86.5
81
83
90
88
December
78.0
90
80
85
54
Average
86.3
80.4
88.2
91.2
89.6
76.6
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
16.8
15
19
16
17
18
February
18.2
22
20
16
14
18
March
23.0
24
24
23
23
24
April
25.6
25
28
25
25
May
29.4
29
33
27
30
June
33.2
34
36
32
32
July
35.6
37
38
34
35
August
32.8
39
33
16
36
September
32.3
36
33
33
29
October
27.1
28
28
28
27
November
20.9
21
19
22
24
December
18.1
20
19
23
16
Average
25.3
19.8
27.4
26.6
24.0
26.3
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
5.6
4
8
4
6
8
February
7.2
13
8
3
3
7
March
11.6
13
12
9
11
15
April
14.2
14
17
14
14
May
18.0
19
21
19
19
June
21.6
21
23
22
22
July
21.9
25
24
24
24
August
21.4
25
24
11
24
September
20.7
23
21
19
20
October
15.3
17
15
17
15
November
10.3
11
10
10
12
December
7.6
9
12
13
4
Average
13.9
9.4
16.0
14.9
13.6
15.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
6
4
4
4
3
February
4.9
2
4
6
6
7
March
2.8
1
1
1
0
11
April
3.4
5
2
3
4
May
2.4
3
1
7
2
June
1.6
1
0
3
2
July
0.7
1
0
1
1
August
2.3
0
8
3
1
September
2.3
2
0
0
7
October
2.8
5
1
1
1
November
3.7
3
9
5
3
December
4.6
5
4
2
5
Average
2.8
3.1
2.7
2.4
3.0
3.7
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
8.0
8
8
8
8
8
February
8.9
9
9
9
8
10
March
8.4
8
9
10
9
8
April
8.4
9
10
8
8
May
7.1
5
9
6
8
June
6.2
6
7
3
7
July
6.4
6
7
6
7
August
5.9
7
6
3
6
September
5.3
6
5
1
8
October
7.1
8
6
7
7
November
7.1
7
7
7
6
December
7.3
7
7
8
5
Average
7.3
8.2
7.2
7.7
5.9
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
350°
324°
349°
337°
292°
February
260°
250°
351°
327°
334°
March
155°
152°
224°
071°
140°
April
075°
167°
101°
075°
May
152°
178°
106°
140°
June
187°
171°
172°
156°
July
193°
190°
182°
170°
August
167°
145°
170°
173°
September
161°
116°
047°
018°
October
060°
128°
218°
348°
November
005°
049°
038°
012°
December
335°
189°
211°
328°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.