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
75
80
92
84
81
February
78.0
93
81
83
72
78
March
90.5
89
94
96
93
86
April
90.0
88
90
90
87
May
93.1
92
95
89
95
June
94.5
99
98
91
96
July
96.0
99
98
92
95
August
95.7
99
96
96
98
September
93.9
96
99
97
89
October
89.0
93
95
93
85
November
87.1
83
89
86
86
December
85.4
93
80
88
83
Average
89.6
86.0
91.8
93.2
89.4
88.7
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
16.7
15
18
17
16
19
February
18.4
21
20
16
14
19
March
23.2
23
24
23
23
26
April
25.4
24
28
24
26
May
29.5
29
32
27
30
June
32.8
34
35
32
33
July
35.3
37
38
32
36
August
35.8
39
35
33
36
September
32.4
36
33
33
30
October
27.3
28
28
28
27
November
21.1
20
20
22
24
December
18.6
19
19
23
18
Average
25.6
19.6
27.4
27.0
25.6
26.9
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
5.7
4
8
4
6
9
February
7.7
10
9
3
4
7
March
12.2
13
13
9
11
16
April
14.0
14
16
14
14
May
18.9
19
21
19
19
June
22.9
24
25
23
23
July
23.9
25
25
23
24
August
23.9
26
24
24
23
September
21.1
23
20
20
20
October
15.2
16
14
17
14
November
10.0
11
10
9
11
December
8.0
8
12
13
5
Average
14.5
9.0
16.3
15.2
15.1
15.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
9
6
5
4
5
February
4.9
2
4
5
5
7
March
3.1
2
1
3
3
6
April
3.0
6
1
4
5
May
3.2
7
0
6
3
June
2.2
2
1
4
2
July
1.1
1
0
1
1
August
2.5
0
4
2
1
September
3.3
3
2
1
8
October
3.7
5
2
2
3
November
3.9
4
9
3
3
December
4.2
2
7
1
7
Average
3.4
4.0
3.1
2.9
2.9
4.0
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
7.1
8
7
7
7
7
February
7.6
8
8
8
8
8
March
7.7
7
8
8
8
8
April
7.9
7
9
8
7
May
7.1
5
9
7
7
June
6.3
6
7
5
6
July
5.6
6
6
4
7
August
5.9
7
6
5
6
September
5.3
6
4
5
7
October
6.4
8
6
6
6
November
6.1
6
6
6
6
December
6.4
6
6
7
6
Average
6.7
7.5
6.5
6.7
6.4
6.6
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
312°
275°
314°
294°
163°
February
242°
234°
319°
324°
303°
March
148°
151°
195°
133°
149°
April
110°
155°
117°
110°
May
119°
159°
125°
147°
June
174°
164°
148°
147°
July
189°
182°
153°
160°
August
169°
151°
153°
161°
September
144°
079°
089°
014°
October
105°
155°
192°
059°
November
041°
085°
140°
095°
December
163°
164°
183°
225°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.