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
83.8
79
83
96
94
69
February
83.7
89
84
86
77
80
March
89.8
90
91
95
89
85
April
91.9
95
96
91
87
May
92.7
92
96
87
96
June
96.3
97
98
93
97
July
96.3
98
98
95
95
August
94.9
100
91
91
98
September
93.4
96
96
94
88
October
90.3
93
96
95
83
November
88.4
90
84
87
90
December
87.2
95
77
89
83
Average
89.9
86.5
92.6
93.1
90.4
88.2
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
15.3
13
17
17
14
16
February
17.2
21
20
17
12
16
March
22.7
23
23
22
22
23
April
24.5
25
26
23
24
May
28.5
29
31
26
28
June
32.5
32
35
32
32
July
34.2
36
36
33
33
August
34.7
39
34
33
33
September
31.2
33
32
31
29
October
25.9
26
27
28
24
November
20.1
19
19
21
22
December
18.4
18
18
22
16
Average
23.7
19.0
25.9
26.2
25.0
24.7
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
3.5
1
6
1
4
6
February
4.9
8
7
1
3
5
March
10.0
11
10
7
10
13
April
12.5
12
13
12
13
May
17.4
17
19
17
17
June
21.2
20
22
22
21
July
23.1
23
24
22
23
August
22.8
24
23
23
22
September
18.9
20
17
19
19
October
12.6
13
11
15
12
November
7.0
8
8
5
8
December
6.1
4
10
11
3
Average
11.4
6.6
13.4
13.1
13.5
13.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.6
13
9
2
4
11
February
8.9
8
10
9
9
10
March
5.5
5
3
4
7
9
April
2.7
3
2
4
2
May
2.6
1
1
7
3
June
1.9
2
1
4
2
July
1.6
0
1
3
3
August
2.7
0
4
4
3
September
2.4
3
0
2
5
October
4.1
4
3
2
6
November
4.0
4
7
3
2
December
5.7
3
9
1
12
Average
4.8
8.1
3.3
3.1
3.9
5.2
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
6.4
6
7
7
7
6
February
6.8
7
7
7
6
7
March
6.8
5
7
7
7
7
April
6.8
7
8
6
6
May
6.0
4
7
6
7
June
4.7
3
4
5
6
July
4.4
5
5
4
5
August
4.4
5
4
4
5
September
4.2
4
3
5
5
October
5.3
5
5
6
5
November
5.0
4
5
6
5
December
5.8
5
6
7
6
Average
5.6
6.2
5.2
5.6
5.6
5.7
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
281°
190°
331°
292°
132°
February
204°
171°
304°
021°
242°
March
170°
142°
180°
138°
159°
April
131°
153°
125°
124°
May
126°
158°
124°
138°
June
195°
135°
144°
161°
July
192°
189°
169°
164°
August
223°
159°
139°
090°
September
124°
055°
077°
017°
October
168°
157°
178°
072°
November
001°
080°
117°
096°
December
257°
172°
180°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.