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
83.7
72
85
89
84
81
February
77.2
94
71
90
64
82
March
86.2
92
65
95
92
82
April
85.0
86
66
91
87
85
May
91.0
90
94
82
96
June
96.5
98
100
91
98
July
97.3
100
100
92
98
August
97.5
99
95
98
100
September
93.5
93
99
99
87
October
90.0
86
98
95
90
November
86.0
83
79
90
86
December
85.0
88
79
92
87
Average
89.2
85.8
85.6
93.0
89.1
89.7
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
15.6
14
19
16
17
18
February
17.3
21
20
16
14
17
March
22.5
24
24
23
23
24
April
25.0
27
25
28
25
25
May
28.8
30
33
27
30
June
33.0
36
36
32
33
July
35.5
38
38
33
36
August
36.1
40
36
34
37
September
32.6
36
33
34
29
October
27.2
28
28
28
27
November
20.9
20
19
22
24
December
18.4
19
19
23
18
Average
25.5
21.4
27.8
27.4
26.0
26.6
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
4.4
2
7
3
4
7
February
6.5
9
7
2
3
5
March
11.8
13
12
8
11
15
April
14.4
16
13
16
14
14
May
19.5
19
21
19
19
June
23.2
24
24
23
22
July
24.2
26
26
23
23
August
24.6
26
24
24
24
September
20.6
17
21
20
20
October
14.4
11
14
17
14
November
9.2
10
8
9
11
December
6.6
6
11
12
4
Average
14.3
9.8
14.7
14.9
15.0
14.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.6
10
10
5
9
4
February
5.9
3
3
5
7
9
March
2.0
2
1
1
2
7
April
3.4
3
11
1
1
3
May
3.3
4
4
6
2
June
0.8
1
1
1
1
July
0.6
0
0
1
1
August
1.8
0
3
2
1
September
2.2
1
0
0
7
October
3.9
8
2
1
1
November
6.3
7
17
4
1
December
6.2
9
5
1
7
Average
3.5
4.2
4.3
3.5
2.7
3.4
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
7.8
8
8
7
8
8
February
8.8
9
10
9
8
9
March
8.9
8
9
10
9
8
April
9.0
9
8
10
9
8
May
8.1
6
10
8
9
June
8.0
8
8
7
8
July
7.8
8
8
7
8
August
7.6
8
7
8
8
September
6.5
7
5
6
8
October
7.6
8
7
7
8
November
7.4
7
6
8
7
December
7.5
7
7
8
8
Average
7.9
8.6
7.8
8.1
7.7
7.9
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
328°
269°
310°
308°
231°
February
232°
241°
321°
261°
306°
March
170°
162°
200°
165°
161°
April
166°
101°
156°
120°
130°
May
137°
164°
121°
149°
June
174°
161°
151°
159°
July
178°
178°
160°
166°
August
169°
157°
166°
169°
September
154°
125°
112°
022°
October
095°
178°
189°
360°
November
246°
077°
185°
161°
December
229°
184°
188°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.