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
85.9
87
80
91
86
84
February
81.7
88
90
92
72
76
March
85.4
81
89
89
90
80
April
91.7
96
87
94
96
92
May
87.1
90
88
95
88
June
89.5
81
93
88
96
July
88.2
80
84
93
94
August
90.1
94
87
89
89
September
91.6
92
90
92
86
October
88.1
91
92
92
76
November
86.3
91
87
97
84
December
81.6
87
76
76
90
Average
87.5
88.0
87.6
89.0
89.2
86.4
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
14.3
13
17
14
13
15
February
18.0
18
20
18
15
16
March
20.5
20
20
22
22
22
April
23.8
24
23
24
23
23
May
27.6
25
29
27
27
June
30.1
29
32
30
28
July
31.7
32
32
31
32
August
31.2
33
31
31
31
September
29.3
28
28
28
27
October
24.9
24
27
24
25
November
19.0
18
22
18
21
December
15.6
15
19
19
14
Average
23.3
18.9
23.7
24.8
23.5
23.5
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
4.0
2
6
2
4
6
February
7.2
6
9
5
5
6
March
8.5
9
8
9
9
12
April
11.0
12
12
10
10
11
May
15.7
15
15
14
15
June
19.2
18
19
20
17
July
21.1
22
21
21
21
August
21.3
22
21
22
22
September
18.4
18
18
17
17
October
13.6
12
13
14
15
November
7.6
7
12
5
10
December
5.9
5
11
8
3
Average
12.2
7.2
12.6
13.2
12.4
12.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.3
7
4
7
10
9
February
6.9
6
5
5
8
14
March
5.3
11
5
4
6
9
April
3.6
3
6
1
2
5
May
4.2
5
1
3
4
June
4.1
2
2
6
3
July
2.2
1
2
5
3
August
4.4
3
5
6
4
September
3.3
2
4
6
6
October
4.2
4
1
4
1
November
4.9
7
4
0
3
December
7.8
6
4
7
6
Average
4.9
6.5
3.9
3.1
5.1
5.3
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
6.2
6
6
6
6
6
February
6.2
6
7
6
7
6
March
6.4
6
6
7
6
6
April
6.1
6
6
6
6
7
May
5.2
5
6
6
6
June
4.6
5
5
5
5
July
3.7
4
4
4
4
August
3.7
4
3
4
3
September
4.4
4
5
4
5
October
4.7
5
5
4
5
November
4.8
5
6
5
5
December
5.6
5
5
5
6
Average
5.2
6.1
4.9
5.3
5.0
5.2
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
295°
276°
300°
289°
329°
February
248°
259°
279°
326°
278°
March
309°
257°
264°
153°
247°
April
262°
269°
246°
281°
303°
May
035°
246°
211°
280°
June
288°
011°
201°
259°
July
295°
247°
246°
245°
August
297°
262°
146°
228°
September
057°
055°
020°
071°
October
338°
349°
285°
067°
November
033°
016°
344°
023°
December
306°
270°
252°
304°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.