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
88.1
86
82
94
83
96
February
85.8
94
84
90
72
93
March
91.4
86
90
92
90
90
April
93.2
83
97
99
96
May
92.8
89
95
99
86
June
93.3
92
95
89
92
July
92.1
92
86
95
92
August
91.3
91
89
91
88
September
90.8
96
90
96
85
October
91.5
92
92
94
88
November
91.2
96
92
98
88
December
86.3
92
86
87
86
Average
90.6
88.3
90.0
91.6
91.5
89.9
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
13.5
14
16
12
12
16
February
17.2
16
19
17
13
16
March
19.5
21
20
21
20
21
April
24.3
24
25
24
24
May
28.2
26
29
28
25
June
31.1
30
33
30
30
July
33.0
33
33
32
34
August
32.0
33
32
33
31
September
29.6
29
30
30
28
October
24.7
24
23
26
25
November
18.3
19
20
18
21
December
15.1
17
14
19
14
Average
23.1
17.3
24.0
24.3
23.6
23.5
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
3.0
3
6
0
3
6
February
5.7
5
8
5
3
6
March
7.5
9
8
8
8
11
April
11.6
12
11
11
11
May
16.6
15
17
14
15
June
20.5
19
20
20
20
July
21.7
23
21
22
20
August
22.1
22
22
23
22
September
18.5
19
18
18
18
October
13.5
12
11
15
14
November
6.6
6
9
5
9
December
4.5
5
5
7
2
Average
11.8
5.5
12.8
12.6
12.3
12.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.7
8
6
8
10
5
February
7.6
10
10
7
13
7
March
6.0
7
8
7
5
5
April
5.3
10
3
2
5
May
3.1
4
2
2
6
June
3.8
3
2
6
6
July
2.3
4
3
4
1
August
2.9
3
5
3
3
September
5.5
2
10
4
7
October
3.2
3
0
2
4
November
5.4
7
6
3
7
December
8.1
7
7
6
8
Average
5.1
8.2
5.4
4.7
4.7
5.0
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
7.7
9
7
8
7
8
February
7.9
9
7
8
8
9
March
8.5
8
8
9
9
8
April
8.6
8
9
8
10
May
7.9
9
9
8
8
June
6.9
7
7
7
7
July
6.4
6
7
6
6
August
6.0
7
6
6
5
September
6.7
7
7
7
7
October
6.5
6
6
7
6
November
6.8
6
7
8
7
December
6.6
6
6
7
7
Average
7.3
8.3
7.0
7.4
7.1
7.3
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
244°
250°
314°
296°
289°
February
262°
247°
265°
342°
246°
March
303°
280°
226°
332°
250°
April
215°
244°
261°
257°
May
005°
261°
284°
307°
June
229°
349°
212°
221°
July
223°
215°
203°
211°
August
235°
208°
183°
201°
September
008°
020°
022°
019°
October
324°
343°
295°
024°
November
005°
028°
331°
331°
December
283°
010°
247°
283°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.