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
95.1
91
93
98
98
95
February
94.2
84
99
100
94
98
March
95.0
92
89
98
98
96
April
96.0
86
98
98
97
May
92.2
89
91
89
96
June
91.6
89
95
99
92
July
96.7
95
98
98
97
August
97.5
98
99
100
99
September
94.9
88
96
95
96
October
93.8
96
84
91
94
November
94.6
99
96
85
99
December
95.2
93
96
85
100
Average
94.2
88.9
92.5
95.5
94.2
96.4
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
19.5
19
16
21
21
20
February
19.5
18
18
23
21
23
March
20.9
19
17
25
21
19
April
25.2
24
26
25
23
May
25.9
24
27
26
29
June
30.7
26
33
32
30
July
35.1
36
34
35
34
August
35.2
35
36
34
36
September
32.7
29
35
32
36
October
29.0
30
28
27
31
November
24.4
24
21
26
25
December
19.7
21
16
17
22
Average
25.6
18.4
25.0
27.4
26.5
27.3
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
7.8
7
7
9
8
7
February
7.6
9
6
8
8
8
March
9.0
9
8
10
8
9
April
11.3
10
12
11
12
May
13.0
13
13
13
14
June
15.3
14
17
16
16
July
18.9
19
18
19
17
August
19.5
19
21
19
20
September
17.9
17
21
17
18
October
14.3
14
15
12
16
November
10.2
10
9
11
9
December
7.6
9
6
7
8
Average
12.2
8.1
12.1
13.4
12.5
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.0
7
12
0
5
0
February
6.6
16
7
1
0
2
March
6.4
12
16
1
3
9
April
1.3
1
0
0
9
May
1.0
3
0
0
0
June
0.1
1
0
0
0
July
0.3
0
0
1
0
August
0.5
4
0
0
0
September
0.5
2
2
1
0
October
0.5
0
0
2
0
November
1.9
2
3
0
1
December
4.9
2
7
12
2
Average
3.3
11.4
3.9
0.9
1.9
1.9
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
5.0
4
6
6
6
5
February
5.4
4
6
7
6
6
March
5.4
5
5
6
6
5
April
5.6
5
6
6
5
May
5.3
5
6
6
5
June
5.4
5
6
6
6
July
5.6
6
6
6
5
August
5.5
5
6
5
6
September
5.1
5
5
5
5
October
5.2
5
5
5
5
November
4.9
6
6
5
5
December
4.4
4
4
4
5
Average
5.2
4.5
5.1
5.6
5.4
5.3
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
327°
333°
021°
004°
355°
February
308°
318°
011°
332°
353°
March
269°
263°
295°
279°
272°
April
270°
279°
278°
275°
May
269°
270°
272°
270°
June
269°
271°
271°
275°
July
271°
271°
272°
271°
August
272°
270°
272°
273°
September
268°
268°
271°
277°
October
307°
272°
278°
299°
November
001°
357°
329°
308°
December
011°
270°
270°
027°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.