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
87.3
88
89
86
87
80
February
79.7
91
76
88
73
78
March
88.9
81
88
91
83
87
April
93.3
92
86
96
94
98
May
96.7
92
98
95
98
June
98.0
98
99
97
98
July
97.4
98
95
97
98
August
96.9
98
96
98
98
September
96.5
99
98
96
93
October
93.9
97
97
95
96
November
89.7
81
86
99
93
December
80.9
95
68
76
91
Average
91.6
88.0
91.5
92.5
91.2
92.6
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
17.0
17
20
16
16
18
February
20.0
20
21
19
16
19
March
22.8
22
23
23
23
25
April
25.2
26
25
26
24
27
May
29.1
29
30
28
29
June
31.7
32
33
31
32
July
32.5
34
31
32
33
August
32.9
36
31
33
33
September
31.4
32
32
29
30
October
27.3
27
26
27
28
November
21.6
21
22
21
25
December
18.5
18
20
22
17
Average
25.3
21.0
26.4
25.9
25.0
26.2
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
7.0
5
9
4
7
10
February
10.6
9
12
8
7
10
March
12.8
13
11
11
14
17
April
15.4
16
16
16
14
16
May
19.8
20
21
19
19
June
23.7
23
25
24
24
July
24.1
24
21
24
25
August
24.6
26
24
24
25
September
22.4
23
21
22
21
October
17.5
16
14
17
18
November
10.6
11
12
9
13
December
9.4
9
13
13
6
Average
15.9
10.8
16.6
15.7
16.1
16.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.4
8
6
7
5
12
February
7.0
6
5
7
8
12
March
5.0
7
8
4
7
4
April
3.6
1
6
3
6
4
May
3.3
4
4
4
4
June
5.8
4
3
9
5
July
5.8
3
6
8
7
August
7.0
1
13
8
4
September
5.4
4
2
11
14
October
4.4
4
4
2
4
November
4.6
11
5
1
3
December
7.0
5
3
4
3
Average
5.4
5.2
4.7
5.1
6.0
6.1
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
7
7
February
7.6
7
8
9
8
7
March
8.0
8
8
8
8
7
April
8.0
9
7
8
8
7
May
7.0
6
7
8
7
June
6.0
6
6
7
7
July
5.3
5
5
5
6
August
5.5
6
5
6
6
September
6.4
6
6
6
8
October
7.1
7
7
6
7
November
6.9
7
7
7
7
December
6.6
7
6
6
7
Average
6.9
8.1
6.6
6.7
6.7
6.9
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
010°
241°
348°
337°
025°
February
104°
164°
063°
003°
355°
March
081°
136°
144°
117°
140°
April
140°
107°
124°
081°
048°
May
104°
145°
122°
118°
June
178°
102°
143°
120°
July
192°
154°
150°
125°
August
133°
137°
115°
129°
September
081°
031°
081°
052°
October
038°
051°
081°
041°
November
031°
008°
017°
018°
December
006°
059°
144°
003°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.