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
89.7
91
89
91
87
February
88.0
93
92
93
72
March
90.6
89
92
87
88
April
93.9
88
96
97
93
May
94.5
94
95
97
June
93.2
94
95
94
July
91.4
93
94
91
August
93.2
94
94
93
100
September
93.5
96
95
96
89
October
91.0
92
91
93
90
November
90.7
88
91
94
69
December
74.6
92
91
27
88
Average
90.6
90.6
91.9
92.9
86.2
88.7
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
17.6
18
20
17
17
February
21.2
20
24
21
18
March
22.9
23
24
25
24
April
25.9
27
27
25
24
May
30.5
28
31
30
June
31.8
32
34
31
July
33.5
34
34
33
August
32.5
34
33
32
26
September
30.3
31
30
30
30
October
27.0
26
25
27
28
November
21.2
21
23
20
23
December
19.0
19
20
23
17
Average
25.3
20.3
26.5
26.8
25.7
25.8
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
6.1
6
7
5
6
February
9.1
7
11
8
8
March
11.2
11
11
11
11
April
13.9
14
13
11
17
May
17.9
17
18
16
June
21.5
21
22
22
July
22.7
23
23
23
August
23.4
23
22
23
26
September
20.8
20
20
20
22
October
15.4
14
10
16
19
November
10.5
10
13
7
16
December
9.5
8
10
11
6
Average
14.6
7.8
14.9
14.6
14.4
17.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.3
3
3
2
11
February
5.3
7
5
2
11
March
5.6
8
3
9
7
April
1.7
3
1
2
0
May
4.0
6
4
1
June
4.0
4
1
6
July
4.4
4
4
5
August
4.7
4
3
8
0
September
4.5
4
5
4
6
October
3.0
6
1
4
1
November
7.2
6
9
7
0
December
4.3
9
2
1
6
Average
4.3
6.2
4.4
3.7
5.6
3.8
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
3.5
4
3
3
3
February
4.1
4
5
4
3
March
4.4
3
5
5
3
April
4.4
5
4
2
7
May
3.9
5
2
4
June
2.6
4
3
2
July
2.0
3
1
2
August
1.9
3
1
1
3
September
3.1
3
3
1
5
October
2.7
4
2
1
5
November
3.0
4
3
2
4
December
2.3
4
2
1
2
Average
3.4
3.9
3.7
2.6
1.9
4.2
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
303°
292°
303°
291°
February
341°
271°
014°
305°
March
350°
286°
269°
053°
April
092°
235°
310°
284°
May
036°
158°
108°
June
287°
099°
212°
July
282°
255°
184°
August
206°
331°
153°
083°
September
058°
048°
073°
063°
October
037°
031°
303°
075°
November
035°
043°
359°
042°
December
360°
057°
272°
293°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.