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
86.0
86
80
97
85
February
80.1
90
82
80
76
100
March
88.4
90
89
80
89
85
April
91.7
94
88
95
89
93
May
91.7
95
91
92
93
June
92.7
96
97
87
94
July
92.2
98
95
94
87
August
90.9
98
78
95
97
September
90.5
97
96
85
91
October
90.5
91
97
91
88
November
85.3
81
85
90
89
December
80.6
89
76
79
87
Average
88.7
90.0
90.9
89.1
88.0
90.2
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
17.1
17
19
17
17
February
20.0
21
21
18
16
19
March
23.2
23
24
23
23
25
April
25.4
27
25
27
24
26
May
28.9
30
31
28
28
June
28.6
34
34
32
31
July
30.1
36
34
33
33
August
33.5
39
33
33
33
September
31.4
35
32
31
30
October
27.2
28
27
28
26
November
21.3
22
21
21
23
December
18.8
20
21
23
17
Average
24.6
22.1
27.8
26.7
25.4
26.9
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
4.8
4
9
3
5
February
8.7
9
10
5
5
0
March
11.2
12
13
8
11
15
April
13.1
15
15
14
12
13
May
17.0
18
19
17
16
June
19.0
22
22
22
20
July
20.3
23
23
23
23
August
21.9
23
23
22
21
September
19.5
20
18
20
20
October
13.9
14
11
16
14
November
8.1
9
8
6
9
December
6.9
5
11
12
4
Average
12.9
9.6
15.0
13.7
14.0
15.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
8
6
2
3
February
5.1
3
7
3
4
0
March
3.1
6
2
2
3
5
April
2.7
3
5
2
5
2
May
3.3
3
3
7
3
June
3.4
1
1
5
3
July
4.8
3
7
4
5
August
3.5
0
5
3
2
September
4.9
2
2
10
6
October
3.6
4
1
1
7
November
5.1
6
7
3
5
December
6.6
4
5
3
9
Average
4.2
4.9
3.4
3.1
4.1
4.3
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
4.4
2
5
6
5
February
4.4
3
5
5
5
5
March
4.4
1
5
5
5
5
April
4.3
1
5
5
4
4
May
3.5
2
4
4
4
June
3.2
1
3
3
4
July
2.5
1
3
2
4
August
2.6
3
2
2
3
September
2.3
1
3
3
4
October
3.1
2
4
4
3
November
2.8
1
4
3
3
December
3.2
1
3
5
4
Average
3.3
1.6
2.4
3.9
3.7
3.7
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
333°
247°
340°
299°
February
274°
195°
001°
009°
259°
March
208°
134°
245°
123°
174°
April
234°
074°
163°
085°
078°
May
130°
180°
116°
139°
June
206°
178°
144°
156°
July
225°
203°
187°
168°
August
265°
164°
197°
356°
September
044°
018°
038°
027°
October
002°
068°
181°
023°
November
304°
025°
013°
019°
December
321°
125°
193°
327°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.