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
88.2
78
91
95
86
90
February
89.4
88
93
92
84
86
March
90.6
86
89
88
90
92
April
94.3
94
92
96
94
May
90.5
97
85
97
91
June
93.6
92
96
92
96
July
96.9
97
98
98
98
August
95.5
96
98
95
92
September
91.4
91
97
97
90
October
90.8
94
93
93
80
November
93.6
86
95
100
96
December
87.0
75
87
95
93
Average
91.3
84.1
91.8
93.1
94.2
91.7
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
8.6
9
12
6
8
10
February
12.7
12
14
13
9
12
March
15.3
17
15
17
17
18
April
21.2
23
21
21
19
May
24.8
23
25
25
23
June
29.1
28
29
30
30
July
32.0
32
31
32
34
August
30.4
30
31
31
30
September
26.8
27
27
28
23
October
21.9
22
20
23
22
November
15.1
15
17
15
19
December
10.7
12
10
15
10
Average
19.8
12.5
21.1
20.7
21.3
20.8
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
-1.2
-1
2
-3
-1
1
February
1.6
1
3
0
-1
2
March
3.5
5
3
3
4
7
April
8.4
10
6
8
7
May
12.1
12
10
12
12
June
17.5
16
18
19
19
July
21.0
21
20
21
22
August
19.7
17
20
21
21
September
16.4
17
16
16
13
October
10.9
10
8
13
11
November
3.2
2
5
2
6
December
0.5
1
0
3
0
Average
8.6
1.7
9.4
8.9
10.1
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.9
11
13
9
10
7
February
10.5
10
9
10
16
13
March
8.6
11
9
8
8
6
April
8.0
10
7
3
10
May
8.5
5
10
6
7
June
5.4
7
4
5
4
July
4.7
2
6
4
4
August
6.6
7
6
8
13
September
6.8
8
3
4
8
October
6.5
4
8
5
12
November
6.7
2
9
4
9
December
9.3
9
13
2
9
Average
7.8
10.6
7.0
7.4
5.8
8.2
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
5.6
6
5
6
5
5
February
5.9
5
6
6
6
6
March
6.7
6
7
8
6
6
April
6.3
6
6
6
7
May
5.3
5
5
5
6
June
4.9
5
5
5
5
July
4.0
4
4
4
4
August
3.9
4
4
3
4
September
4.4
4
5
5
4
October
4.7
4
5
5
4
November
4.8
4
5
5
5
December
4.2
3
4
4
6
Average
5.1
5.6
4.7
5.1
5.0
5.1
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
286°
280°
290°
311°
293°
February
255°
241°
245°
281°
244°
March
296°
285°
233°
282°
243°
April
215°
274°
291°
283°
May
012°
029°
290°
317°
June
269°
254°
205°
201°
July
208°
208°
207°
225°
August
232°
202°
135°
210°
September
350°
314°
238°
002°
October
279°
297°
275°
251°
November
300°
256°
295°
238°
December
278°
280°
212°
259°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.