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
85.2
79
81
90
87
84
February
81.9
94
86
87
76
86
March
87.5
76
88
94
93
85
April
88.8
87
94
89
79
May
90.7
91
100
86
98
June
93.3
96
99
94
91
July
93.2
97
97
89
84
August
95.8
98
96
94
98
September
94.2
98
98
96
92
October
90.0
92
97
90
92
November
85.9
84
79
90
85
December
86.6
93
79
85
91
Average
89.0
82.5
91.2
92.8
89.3
88.9
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
18.8
17
20
18
19
21
February
20.1
22
21
18
16
20
March
24.7
24
25
25
25
26
April
27.0
26
30
27
27
May
30.9
30
36
29
32
June
34.5
35
38
33
33
July
36.3
38
38
33
37
August
36.8
40
36
34
38
September
33.6
37
34
34
31
October
28.6
29
30
30
29
November
22.7
22
21
23
26
December
20.5
22
21
24
20
Average
27.1
20.9
28.8
28.5
27.2
28.3
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
5
7
10
February
9.0
11
10
6
5
7
March
13.5
14
15
9
12
17
April
15.3
15
16
16
15
May
20.2
20
24
20
20
June
23.4
24
24
23
22
July
23.9
25
25
24
25
August
23.5
26
25
24
24
September
21.5
24
20
21
21
October
16.4
18
16
17
16
November
11.3
12
12
10
13
December
8.9
8
13
14
6
Average
15.4
10.0
17.2
16.0
16.1
16.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.8
4
3
4
4
6
February
4.2
2
3
6
5
6
March
2.8
3
2
1
3
6
April
2.6
2
0
4
5
May
2.8
3
1
6
1
June
1.9
0
0
3
2
July
1.3
1
0
4
3
August
2.0
0
3
1
1
September
3.7
0
1
1
6
October
2.6
5
2
1
1
November
4.7
4
11
5
4
December
4.3
4
1
1
4
Average
3.0
2.8
2.0
2.6
3.2
3.4
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
6.7
7
7
6
7
7
February
7.6
8
8
7
8
8
March
7.4
6
8
9
8
7
April
7.3
8
8
8
6
May
6.8
4
10
8
7
June
6.4
6
7
5
6
July
5.7
6
7
5
7
August
5.9
6
6
5
6
September
5.1
5
4
5
7
October
5.8
7
6
5
6
November
5.7
6
6
5
5
December
6.1
6
6
7
6
Average
6.4
6.8
6.2
6.5
6.2
6.4
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
353°
015°
358°
351°
136°
February
233°
032°
010°
030°
001°
March
133°
136°
185°
123°
139°
April
104°
020°
118°
092°
May
130°
162°
125°
139°
June
171°
165°
150°
144°
July
177°
173°
154°
160°
August
158°
159°
158°
162°
September
144°
122°
101°
027°
October
088°
136°
150°
101°
November
042°
058°
087°
095°
December
100°
143°
182°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.