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
90.4
95
89
85
87
96
February
86.2
98
85
94
70
87
March
91.9
90
94
91
91
91
April
95.5
93
96
99
96
May
94.5
94
94
97
94
June
96.6
98
98
97
93
July
97.3
97
96
97
99
August
95.3
95
94
95
98
September
94.4
94
94
99
92
October
94.0
96
80
98
96
November
91.6
94
86
99
95
December
87.9
91
87
89
91
Average
93.3
93.9
93.7
91.8
93.6
94.1
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
13.6
14
16
12
13
16
February
16.7
16
19
17
13
15
March
18.4
20
20
20
19
20
April
22.0
23
22
23
23
May
25.5
24
27
26
25
June
28.4
28
29
29
28
July
30.6
31
31
30
31
August
29.7
31
30
30
30
September
28.3
28
28
28
27
October
24.4
24
22
25
25
November
18.8
18
20
18
21
December
15.9
16
16
19
15
Average
22.0
16.5
23.1
22.9
22.5
22.9
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
5.2
4
7
2
6
8
February
8.1
7
10
7
6
7
March
9.9
12
11
10
10
12
April
13.8
14
13
13
14
May
18.6
17
20
17
18
June
22.1
21
22
22
21
July
24.0
25
25
24
25
August
23.9
24
24
24
24
September
21.1
20
20
21
21
October
15.8
15
11
17
18
November
9.5
9
13
7
13
December
7.1
7
8
9
5
Average
14.1
7.3
14.9
14.8
14.7
15.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.8
2
6
6
10
3
February
9.4
6
11
6
19
12
March
5.9
6
7
7
5
7
April
3.5
5
3
1
4
May
3.9
8
1
2
3
June
3.8
3
3
6
4
July
4.5
3
11
4
3
August
4.9
5
5
6
6
September
5.6
5
6
4
7
October
3.3
3
1
4
2
November
5.1
7
5
2
8
December
8.8
7
1
9
5
Average
5.2
4.8
5.6
4.7
5.6
5.2
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
8.4
9
8
9
8
9
February
8.2
8
8
8
8
9
March
9.1
9
9
9
9
8
April
9.5
9
9
10
10
May
9.1
9
10
9
9
June
8.3
8
8
8
9
July
8.3
8
9
8
7
August
7.4
8
7
7
7
September
7.9
7
7
7
7
October
7.7
8
7
8
7
November
7.7
7
8
8
8
December
7.5
8
6
7
8
Average
8.3
8.9
8.1
8.0
8.1
8.1
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
267°
246°
320°
287°
303°
February
275°
241°
150°
317°
250°
March
237°
259°
194°
050°
196°
April
166°
200°
224°
242°
May
101°
181°
181°
180°
June
192°
157°
174°
207°
July
194°
196°
187°
180°
August
189°
182°
171°
189°
September
011°
068°
140°
027°
October
343°
354°
298°
059°
November
352°
005°
339°
005°
December
320°
353°
249°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.