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
91.8
96
91
87
92
89
February
96.2
93
91
99
98
97
March
96.5
99
91
95
100
98
April
96.6
95
96
98
94
May
95.9
94
97
92
99
June
95.1
94
95
90
99
July
95.0
97
94
92
97
August
94.9
98
98
97
87
September
93.1
95
98
96
74
October
95.9
96
89
96
97
November
91.6
99
97
90
96
December
91.1
86
84
86
96
Average
94.7
95.9
93.9
94.4
93.9
93.7
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
14.7
15
15
15
15
14
February
15.9
16
14
18
17
18
March
16.5
16
14
18
17
16
April
18.3
17
19
18
18
May
19.6
18
20
20
22
June
22.2
20
23
23
23
July
21.9
22
21
22
22
August
23.2
25
23
23
24
September
23.7
23
25
23
25
October
22.5
24
20
21
25
November
17.8
20
16
18
17
December
14.6
17
13
13
16
Average
18.8
15.5
19.1
19.3
19.0
19.9
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
8.8
10
9
8
9
9
February
8.3
9
7
8
9
9
March
9.2
10
8
9
9
9
April
10.5
10
10
10
11
May
11.7
12
11
11
12
June
13.5
13
13
15
13
July
13.7
14
14
14
13
August
14.7
16
15
15
15
September
14.8
15
15
14
15
October
12.9
15
12
13
14
November
10.2
12
8
11
9
December
8.6
10
7
9
8
Average
11.2
9.5
11.7
11.0
11.5
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
14
17
0
5
3
February
9.6
20
20
0
3
0
March
8.2
11
24
1
2
6
April
1.9
0
2
1
4
May
1.5
3
0
0
2
June
0.1
0
1
0
0
July
0.0
0
0
0
0
August
0.2
1
0
0
1
September
0.2
0
2
0
0
October
0.7
1
0
5
0
November
3.3
2
5
2
1
December
7.1
11
17
12
3
Average
4.5
14.7
6.1
1.6
2.2
1.5
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
6.6
7
9
4
7
7
February
8.4
8
9
7
8
8
March
9.0
10
10
10
9
8
April
10.9
12
12
12
10
May
12.0
10
14
14
11
June
11.8
11
12
12
12
July
11.9
12
12
11
11
August
10.6
10
10
10
10
September
9.9
9
10
10
9
October
7.7
7
8
9
7
November
5.8
5
6
5
7
December
5.9
5
6
7
5
Average
9.3
8.3
9.3
9.6
9.7
8.9
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
216°
145°
069°
357°
295°
February
173°
274°
325°
297°
303°
March
267°
225°
296°
285°
257°
April
290°
283°
285°
271°
May
266°
288°
283°
271°
June
270°
293°
286°
289°
July
299°
296°
298°
304°
August
295°
301°
299°
308°
September
290°
298°
301°
301°
October
294°
299°
273°
313°
November
303°
281°
001°
299°
December
156°
194°
220°
332°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.