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
85.3
81
83
92
87
80
February
83.0
98
86
86
80
86
March
90.4
88
91
93
89
87
April
91.7
91
93
88
88
May
96.5
91
99
95
99
June
96.9
100
100
95
97
July
98.6
99
98
98
98
August
97.5
100
96
100
100
September
94.8
98
100
96
89
October
92.3
95
97
97
89
November
89.5
84
90
94
90
December
88.1
91
82
91
86
Average
92.0
89.0
92.7
94.3
92.7
91.1
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
18.3
16
20
18
18
20
February
20.6
22
21
18
17
20
March
24.3
24
25
23
24
26
April
26.3
25
28
26
27
May
30.3
30
32
29
31
June
33.4
35
36
33
33
July
34.7
36
36
33
35
August
35.1
39
34
35
36
September
32.4
35
33
32
32
October
27.8
28
28
29
28
November
22.4
21
21
23
25
December
20.1
20
21
25
20
Average
26.4
20.9
27.8
27.5
26.9
27.6
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
7.8
6
10
6
8
10
February
10.3
12
11
6
6
9
March
14.0
15
15
10
13
18
April
16.0
16
18
15
17
May
20.9
20
22
21
20
June
24.0
24
25
24
23
July
25.1
26
26
24
26
August
25.0
27
25
25
24
September
22.5
24
21
21
23
October
17.1
18
16
19
16
November
11.9
12
12
11
14
December
10.0
9
14
15
8
Average
16.3
10.7
17.5
16.8
17.0
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
9.0
15
10
7
6
11
February
8.5
3
8
9
14
7
March
6.7
5
6
9
8
8
April
5.5
6
5
8
6
May
4.2
4
2
11
3
June
3.7
1
1
5
4
July
3.2
1
3
6
5
August
3.9
1
7
2
1
September
5.5
1
1
7
8
October
5.8
10
4
3
6
November
7.6
11
17
3
4
December
6.7
3
8
2
8
Average
5.9
7.1
4.9
5.7
6.2
5.7
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
8.6
9
9
8
8
8
February
8.8
9
9
9
9
9
March
9.2
8
10
10
10
9
April
9.8
9
11
10
9
May
8.9
7
10
10
9
June
7.3
6
7
7
8
July
6.2
6
7
5
7
August
6.6
7
7
7
6
September
6.9
7
6
6
8
October
7.7
9
7
7
7
November
7.4
7
8
7
7
December
7.5
7
7
8
8
Average
8.0
8.8
7.7
8.1
7.7
7.9
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
002°
353°
353°
332°
101°
February
213°
196°
004°
047°
027°
March
121°
131°
162°
112°
140°
April
098°
140°
106°
097°
May
117°
151°
126°
138°
June
185°
153°
133°
128°
July
190°
169°
151°
155°
August
164°
154°
136°
148°
September
118°
068°
070°
025°
October
091°
105°
122°
054°
November
051°
074°
072°
074°
December
072°
125°
167°
135°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.