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
82.1
93
92
99
98
93
February
85.0
91
97
100
98
99
March
95.7
92
84
98
99
98
April
96.5
97
84
99
99
98
May
95.8
89
97
100
98
June
96.7
98
97
98
98
July
94.5
94
100
99
74
August
98.8
99
100
100
99
September
97.0
94
98
99
96
October
96.8
96
92
99
97
November
95.5
97
97
90
97
December
93.2
89
95
81
99
Average
93.9
93.3
93.0
97.6
96.6
95.3
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
18.1
20
17
21
20
20
February
19.9
18
18
23
21
23
March
21.2
20
17
25
21
19
April
24.6
23
24
26
25
23
May
24.8
23
26
25
28
June
28.9
25
32
30
29
July
31.8
33
32
33
26
August
33.1
33
34
32
34
September
31.5
29
34
31
34
October
28.6
30
27
27
30
November
24.5
25
22
26
25
December
18.3
22
17
17
22
Average
24.9
20.1
25.1
26.7
25.7
26.0
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
4.6
5
6
6
3
4
February
5.0
8
5
5
5
4
March
6.9
8
6
7
5
8
April
9.1
9
10
10
8
10
May
11.1
12
11
11
12
June
13.8
13
15
14
13
July
15.9
16
16
17
12
August
16.9
17
18
17
17
September
14.7
15
18
14
13
October
10.7
11
13
9
11
November
6.6
8
6
8
4
December
4.3
8
4
4
4
Average
9.7
7.3
10.9
11.0
9.5
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.5
7
18
1
4
0
February
5.9
19
10
0
1
1
March
6.1
10
19
2
4
9
April
1.6
1
1
0
0
10
May
1.7
4
1
0
1
June
0.0
0
0
0
0
July
0.2
0
0
1
0
August
0.5
4
0
0
0
September
0.4
1
1
0
0
October
0.7
1
0
2
1
November
2.8
2
5
0
2
December
6.6
6
10
15
3
Average
3.1
9.0
4.4
1.3
2.0
2.1
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
4.1
4
5
4
4
4
February
4.9
4
6
7
4
6
March
5.3
6
5
6
5
5
April
5.7
5
5
6
6
5
May
5.5
6
5
5
6
June
5.9
6
6
6
6
July
6.0
6
7
7
5
August
6.5
6
7
6
7
September
5.5
5
5
6
5
October
5.1
5
4
4
5
November
4.6
5
5
4
4
December
3.7
3
3
3
4
Average
5.2
4.7
5.3
5.6
5.1
5.0
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
253°
023°
087°
068°
188°
February
278°
182°
057°
004°
034°
March
279°
266°
287°
271°
259°
April
271°
276°
276°
277°
277°
May
274°
275°
277°
275°
June
279°
278°
279°
280°
July
277°
279°
280°
280°
August
279°
280°
277°
280°
September
275°
277°
278°
277°
October
290°
280°
274°
288°
November
045°
040°
304°
290°
December
127°
240°
262°
086°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.