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
87.8
85
83
91
88
86
February
83.4
94
88
89
79
86
March
90.0
91
88
97
94
85
April
90.9
89
93
87
84
May
94.7
94
98
92
99
June
96.9
98
100
97
98
July
98.0
100
100
91
100
August
99.1
100
99
99
100
September
96.7
100
99
99
97
October
93.8
92
99
98
91
November
87.8
84
84
95
86
December
84.6
86
69
82
92
Average
92.0
89.9
92.0
94.2
92.0
92.3
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
18.4
16
21
18
19
20
February
19.9
22
21
18
16
20
March
24.5
24
26
25
25
26
April
27.4
27
29
27
27
May
31.0
29
35
29
32
June
34.3
36
37
32
33
July
35.9
38
38
32
37
August
36.1
39
35
35
37
September
33.1
36
34
34
32
October
27.9
28
29
29
29
November
21.9
21
21
22
25
December
19.8
20
20
23
20
Average
26.7
20.5
28.5
28.5
26.8
28.2
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
6.7
5
9
5
6
10
February
8.6
11
9
4
5
8
March
13.3
14
15
9
12
16
April
15.8
15
18
16
16
May
20.3
20
22
19
20
June
23.6
24
25
23
23
July
24.8
26
26
24
26
August
24.9
26
25
25
25
September
22.5
25
22
22
21
October
16.8
18
17
18
16
November
11.4
12
11
11
13
December
8.5
8
13
13
6
Average
15.7
9.6
17.2
16.5
16.2
16.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.6
11
12
8
10
8
February
12.1
2
9
16
17
9
March
6.4
7
10
2
4
10
April
6.9
9
8
10
11
May
5.6
7
2
8
2
June
2.7
2
0
4
3
July
1.9
1
0
6
2
August
2.2
1
3
3
1
September
5.0
0
0
1
6
October
6.1
10
3
2
5
November
9.9
15
17
3
8
December
10.6
8
20
11
7
Average
6.5
6.8
6.7
5.7
6.3
5.6
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
7.5
8
7
8
8
8
February
8.4
9
9
9
8
9
March
9.1
9
9
10
10
8
April
9.4
9
10
9
8
May
9.0
7
11
9
9
June
8.4
8
8
8
8
July
7.9
8
9
7
8
August
7.7
8
8
8
7
September
6.9
6
6
6
9
October
7.8
9
7
7
7
November
7.2
7
8
7
7
December
7.1
7
7
7
7
Average
8.1
8.2
7.7
8.3
7.7
8.0
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
357°
350°
353°
344°
126°
February
224°
289°
003°
035°
350°
March
131°
131°
184°
115°
116°
April
104°
132°
101°
100°
May
124°
148°
112°
135°
June
155°
145°
135°
137°
July
157°
154°
135°
145°
August
144°
145°
149°
149°
September
146°
124°
108°
036°
October
112°
144°
136°
106°
November
033°
077°
119°
111°
December
108°
133°
172°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.