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
99.4
98
99
100
100
99
February
99.5
99
100
100
100
99
March
99.7
100
100
100
100
99
April
99.8
100
100
100
100
100
May
99.9
100
100
100
100
100
June
99.9
100
100
100
100
100
July
99.8
100
100
100
100
100
August
100.0
100
100
100
100
100
September
99.9
100
100
100
100
100
October
99.6
100
100
100
100
100
November
99.8
100
99
100
100
December
99.1
99
98
98
100
Average
99.7
99.7
99.7
99.7
99.7
99.7
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
19.6
19
18
21
20
20
February
21.4
22
20
22
23
22
March
25.4
25
23
27
25
24
April
31.3
30
31
32
32
30
May
35.2
36
36
36
35
37
June
40.8
42
39
41
42
40
July
42.4
44
46
42
40
43
August
41.4
43
43
40
40
44
September
38.7
41
39
39
38
40
October
32.5
36
34
31
31
35
November
25.8
27
22
28
27
December
19.9
22
17
21
20
Average
31.5
33.9
31.4
31.2
31.1
31.8
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
8.2
8
7
9
8
8
February
9.4
11
8
9
10
9
March
12.6
12
11
13
12
13
April
17.2
17
16
17
18
17
May
21.4
22
22
22
21
23
June
27.2
30
25
28
29
27
July
30.8
33
33
31
29
32
August
30.0
32
32
29
29
32
September
26.7
28
27
28
26
27
October
19.6
22
21
20
18
20
November
13.3
15
10
15
14
December
8.7
10
8
10
7
Average
19.1
21.4
18.9
18.9
18.6
18.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.9
5
5
0
3
1
February
2.7
3
1
1
0
2
March
1.5
3
3
1
0
3
April
0.0
0
0
0
0
0
May
0.1
1
0
0
0
0
June
0.1
0
0
0
1
0
July
0.8
0
0
1
3
0
August
0.3
0
0
1
1
0
September
0.9
0
1
1
3
0
October
0.6
0
0
0
0
0
November
0.5
1
0
0
0
December
2.1
2
4
3
1
Average
0.9
1.1
1.0
0.7
1.1
0.5
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
5
5
5
5
4
February
6.1
6
8
6
6
6
March
6.2
6
6
7
7
6
April
6.5
6
6
7
7
6
May
6.4
6
7
6
6
6
June
6.0
6
6
6
7
6
July
6.2
6
6
6
6
6
August
5.7
6
6
5
6
6
September
5.8
7
6
5
5
6
October
5.6
5
5
6
6
5
November
4.8
5
6
5
4
December
4.5
4
4
4
5
Average
5.8
6.0
5.9
5.9
5.7
5.4
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
120°
147°
068°
109°
110°
February
175°
158°
101°
264°
098°
March
160°
208°
219°
201°
167°
April
203°
226°
219°
208°
197°
May
219°
170°
228°
194°
240°
June
179°
188°
165°
215°
200°
July
259°
260°
255°
163°
252°
August
180°
187°
210°
133°
265°
September
137°
159°
124°
129°
139°
October
162°
131°
101°
121°
137°
November
098°
129°
095°
175°
December
096°
148°
118°
075°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.