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
83.3
78
75
83
86
82
February
79.1
91
79
86
76
82
March
86.3
87
85
84
86
83
April
90.2
92
87
93
86
83
May
94.6
90
98
93
98
June
96.1
96
96
96
95
July
96.0
98
96
91
94
August
97.9
98
97
98
100
September
95.3
97
98
99
92
October
90.9
94
96
93
89
November
85.4
86
71
93
91
December
86.1
94
72
82
93
Average
90.0
87.0
90.0
90.0
90.3
90.2
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
19.6
17
22
20
20
22
February
21.1
22
22
19
17
22
March
24.9
25
26
24
25
27
April
27.4
28
26
29
26
29
May
31.0
30
34
29
32
June
33.8
35
36
32
33
July
34.9
37
36
33
35
August
35.5
39
35
34
36
September
33.1
36
33
34
32
October
28.7
28
30
30
30
November
23.3
22
22
24
27
December
21.2
21
22
25
21
Average
27.3
22.9
28.6
28.3
27.3
28.7
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
7.9
7
10
7
7
11
February
10.1
12
11
4
6
10
March
14.2
15
15
10
13
18
April
16.7
19
16
18
17
18
May
20.9
21
23
21
21
June
23.7
24
24
24
23
July
24.4
25
25
24
26
August
23.9
24
24
24
23
September
21.6
23
20
21
21
October
16.7
18
15
18
16
November
11.5
13
11
11
13
December
9.6
9
14
15
7
Average
16.3
12.9
17.4
16.3
16.7
17.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.7
7
3
11
2
7
February
3.3
3
1
4
4
3
March
3.1
3
5
3
3
2
April
2.7
1
6
1
4
4
May
1.9
1
0
5
1
June
3.2
0
1
4
3
July
3.0
4
2
9
3
August
2.0
1
2
1
2
September
3.7
2
2
3
4
October
3.7
7
3
3
1
November
5.4
8
12
4
3
December
4.4
5
5
2
4
Average
3.4
3.2
3.5
3.4
3.6
2.9
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
9.7
10
10
9
9
10
February
10.4
11
10
11
11
11
March
10.9
9
11
12
11
12
April
11.4
12
11
13
11
10
May
10.7
8
13
11
10
June
9.3
10
9
8
9
July
8.4
9
9
7
9
August
8.5
10
9
7
8
September
7.5
8
6
7
9
October
8.3
9
9
8
8
November
8.4
7
9
8
8
December
8.8
8
9
10
9
Average
9.5
10.5
9.2
9.8
9.1
9.4
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
016°
167°
353°
035°
112°
February
169°
145°
019°
079°
118°
March
124°
137°
147°
109°
142°
April
145°
108°
144°
112°
100°
May
117°
154°
131°
144°
June
165°
154°
146°
138°
July
168°
167°
142°
152°
August
155°
148°
140°
154°
September
136°
098°
097°
033°
October
088°
115°
115°
080°
November
040°
067°
087°
090°
December
067°
137°
169°
243°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.