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
86.4
79
83
93
86
79
February
82.1
91
85
88
78
85
March
90.5
91
87
95
98
80
April
93.4
96
98
92
89
May
93.5
95
93
87
94
June
95.8
93
100
94
99
July
98.5
100
100
98
92
August
97.2
100
93
96
99
September
94.6
95
98
98
90
October
89.0
91
91
96
88
November
87.3
87
78
95
90
December
87.3
92
78
90
85
Average
91.1
87.1
92.2
92.8
92.5
89.4
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
14.5
11
17
15
14
16
February
16.4
20
17
15
11
16
March
21.6
21
21
22
22
22
April
24.2
23
26
23
24
May
28.8
28
31
26
29
June
33.2
33
35
32
33
July
35.7
37
38
34
35
August
35.4
40
35
34
36
September
32.0
34
32
33
29
October
25.7
26
26
28
25
November
19.5
19
17
20
23
December
16.6
17
16
22
16
Average
24.4
17.5
26.0
25.9
25.0
25.3
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
4.0
2
6
2
5
7
February
5.6
9
6
2
2
6
March
11.0
12
11
8
11
14
April
13.4
13
15
13
13
May
18.3
19
18
18
17
June
21.4
22
24
23
14
July
22.5
25
26
24
8
August
23.6
27
25
24
17
September
21.3
23
21
21
20
October
14.2
16
14
16
13
November
8.4
9
8
8
11
December
6.6
6
9
11
5
Average
13.4
7.5
15.3
14.4
14.7
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.2
8
9
3
6
6
February
6.6
6
7
8
4
10
March
4.4
6
6
5
2
7
April
3.2
4
1
5
4
May
4.7
5
1
10
6
June
2.4
2
1
4
2
July
0.9
1
0
1
2
August
3.1
0
6
3
1
September
3.2
3
2
1
8
October
6.8
6
10
5
3
November
5.3
6
13
2
2
December
5.7
7
2
2
9
Average
4.4
6.5
4.3
4.1
3.8
4.8
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
9.4
9
10
9
9
9
February
9.8
10
10
10
10
11
March
10.1
10
10
11
11
10
April
10.5
10
13
10
9
May
9.1
7
12
8
10
June
8.3
8
9
8
9
July
7.4
8
9
7
7
August
7.3
8
7
8
7
September
7.4
8
6
7
8
October
8.5
9
8
9
9
November
8.5
8
8
9
9
December
8.7
8
9
10
9
Average
8.8
9.6
8.6
9.2
8.8
8.7
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
314°
265°
312°
312°
194°
February
222°
245°
302°
330°
295°
March
171°
199°
205°
173°
166°
April
134°
170°
150°
178°
May
146°
171°
136°
153°
June
144°
156°
168°
172°
July
177°
171°
159°
167°
August
160°
150°
163°
159°
September
151°
140°
130°
043°
October
148°
174°
197°
121°
November
162°
141°
183°
166°
December
217°
204°
188°
257°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.