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
89.5
95
83
92
84
93
February
87.9
96
92
92
72
84
March
91.3
85
93
89
91
89
April
94.1
88
95
99
95
May
93.6
88
93
98
92
June
94.0
94
98
91
97
July
94.2
94
92
92
96
August
92.3
95
90
93
93
September
93.0
97
94
93
89
October
90.7
93
91
92
90
November
89.5
90
90
99
92
December
85.1
90
83
85
89
Average
91.5
91.6
91.3
91.9
90.6
91.6
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
16.2
16
18
15
15
17
February
19.8
18
22
20
16
18
March
22.2
22
22
23
20
24
April
25.4
25
25
25
25
May
28.8
26
30
29
27
June
31.2
30
33
31
30
July
32.5
33
32
31
33
August
32.0
33
31
32
32
September
30.0
29
29
29
29
October
26.0
25
25
26
26
November
20.0
20
21
19
22
December
17.2
17
18
21
16
Average
24.4
18.7
24.9
25.3
24.7
24.8
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
4.8
4
6
3
4
7
February
7.8
5
10
7
5
7
March
9.5
10
10
9
7
12
April
12.0
13
10
12
12
May
16.7
16
18
15
16
June
20.5
20
20
21
20
July
22.3
23
23
22
23
August
22.1
22
21
23
22
September
19.3
18
19
18
20
October
14.4
12
11
15
16
November
8.2
8
11
6
11
December
6.4
6
8
9
3
Average
12.9
6.3
13.5
13.3
13.5
14.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
4
7
4
11
8
February
6.5
6
6
4
11
12
March
5.1
7
5
6
5
9
April
3.4
4
2
4
4
May
2.7
0
2
2
3
June
4.6
5
1
8
2
July
2.9
4
4
4
2
August
3.0
3
3
4
2
September
3.0
2
3
5
6
October
3.9
3
1
5
1
November
6.6
10
7
8
5
December
8.4
13
4
5
7
Average
4.6
5.6
4.7
3.3
5.7
4.8
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
5.7
7
5
6
5
6
February
5.4
5
6
5
5
6
March
5.8
5
6
7
4
5
April
5.7
5
6
6
6
May
5.0
5
5
5
5
June
4.2
4
4
4
5
July
3.7
4
4
3
4
August
3.3
3
3
3
3
September
3.8
4
4
3
4
October
3.8
4
3
3
4
November
4.3
4
5
4
4
December
4.6
5
4
4
5
Average
4.7
5.6
4.5
4.6
4.1
4.8
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
281°
273°
300°
267°
297°
February
274°
253°
243°
299°
269°
March
282°
267°
249°
027°
243°
April
233°
239°
261°
266°
May
335°
230°
244°
295°
June
271°
103°
201°
270°
July
271°
224°
227°
216°
August
257°
255°
191°
209°
September
018°
012°
321°
039°
October
340°
346°
306°
042°
November
353°
004°
338°
015°
December
299°
316°
257°
283°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.