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
87.0
83
87
92
100
85
February
93.4
92
93
95
75
100
March
93.3
96
89
97
69
100
April
96.8
99
97
86
100
May
98.1
98
99
97
97
June
98.2
99
98
99
96
July
99.5
100
99
100
100
August
97.6
99
100
80
89
September
97.4
100
97
97
72
October
98.5
99
100
96
81
November
95.2
100
96
59
81
December
88.2
92
84
61
96
Average
94.1
90.7
96.3
96.6
88.7
92.7
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
12.2
13
14
16
11
11
February
13.9
15
14
20
12
16
March
16.0
17
14
23
15
15
April
21.2
23
23
22
21
May
26.2
27
29
28
25
June
31.4
31
34
32
30
July
34.4
37
36
34
32
August
33.4
36
37
33
32
September
29.4
30
33
29
29
October
23.8
27
28
19
24
November
15.5
19
16
14
14
December
11.9
15
14
9
12
Average
21.6
15.1
23.8
26.0
21.6
21.5
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
5.0
6
4
3
6
6
February
4.8
6
3
3
5
5
March
6.8
7
5
7
6
7
April
10.1
9
9
10
11
May
13.8
14
14
14
15
June
18.0
17
18
19
18
July
20.8
21
20
21
21
August
20.2
21
21
20
21
September
17.0
17
18
17
18
October
11.4
11
13
12
13
November
6.5
6
4
8
5
December
4.3
6
3
5
3
Average
11.0
6.5
11.0
11.2
11.9
11.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.5
13
20
2
0
8
February
6.1
13
6
0
6
0
March
10.3
11
19
2
6
11
April
3.7
2
3
5
19
May
0.6
1
0
0
3
June
0.3
0
1
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.5
1
1
0
0
October
1.7
4
0
8
0
November
2.9
2
5
0
0
December
7.4
6
6
26
0
Average
4.2
12.1
4.7
1.3
2.7
3.2
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
9.0
8
10
10
8
7
February
8.4
9
9
8
7
9
March
9.2
11
9
7
9
12
April
9.0
8
10
8
10
May
8.4
7
11
8
7
June
7.2
6
9
7
5
July
5.4
6
6
5
5
August
5.4
6
5
4
4
September
5.6
6
5
6
4
October
5.6
6
4
8
4
November
6.3
6
7
5
7
December
6.7
6
8
7
7
Average
7.0
9.2
7.1
7.5
6.8
6.5
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
127°
130°
303°
174°
149°
February
139°
141°
306°
316°
304°
March
134°
135°
257°
075°
132°
April
224°
162°
172°
165°
May
155°
274°
294°
144°
June
172°
161°
150°
159°
July
165°
152°
153°
160°
August
191°
156°
168°
147°
September
168°
169°
172°
272°
October
256°
297°
141°
154°
November
295°
256°
293°
319°
December
126°
137°
117°
266°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.