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
74
92
90
82
February
82.1
90
79
86
76
79
March
90.3
86
89
93
89
89
April
93.8
89
91
96
94
94
May
96.5
95
94
97
98
June
97.1
98
98
96
97
July
96.8
99
93
98
97
August
96.4
99
93
99
99
September
96.2
96
96
97
95
October
92.9
92
97
94
89
November
88.8
81
82
95
90
December
83.6
87
73
85
94
Average
91.6
87.7
90.3
91.6
92.6
92.3
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
16
20
17
17
19
February
20.5
21
21
20
16
20
March
23.5
23
24
23
23
25
April
25.8
26
26
27
25
27
May
29.5
30
31
28
29
June
32.1
34
33
31
32
July
32.8
35
33
32
32
August
33.1
38
32
33
34
September
31.7
34
32
30
30
October
27.8
28
27
29
28
November
22.4
22
22
22
27
December
19.4
19
22
23
18
Average
25.8
21.5
27.6
26.6
25.7
26.6
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
7.2
5
11
5
7
10
February
10.3
10
12
7
5
10
March
13.3
13
14
10
13
17
April
15.3
16
16
16
15
15
May
19.9
20
21
20
19
June
23.2
24
24
23
22
July
23.5
25
22
24
25
August
24.0
26
24
23
24
September
21.9
23
21
21
22
October
16.6
16
14
18
15
November
10.4
11
10
9
13
December
9.2
8
12
13
7
Average
15.7
11.0
17.2
15.6
15.9
16.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.4
7
9
4
2
7
February
8.0
8
8
3
5
5
March
5.5
5
5
2
5
2
April
5.0
2
4
3
3
2
May
4.2
2
3
10
2
June
5.1
2
2
8
7
July
5.3
1
7
3
8
August
5.1
1
11
2
3
September
5.1
2
8
8
4
October
4.3
5
1
1
5
November
5.4
8
9
1
6
December
9.1
8
6
4
3
Average
5.7
5.3
4.3
4.8
4.3
4.4
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
9.5
10
10
10
9
9
February
10.0
9
10
10
10
10
March
10.0
9
10
10
10
10
April
10.0
10
10
12
9
9
May
8.3
7
8
9
9
June
7.2
7
6
8
8
July
5.7
6
5
5
7
August
5.9
7
5
6
6
September
6.1
6
6
6
8
October
7.7
8
7
7
8
November
7.7
8
9
6
8
December
8.1
7
7
8
9
Average
8.2
9.5
7.9
7.9
7.7
8.3
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
043°
166°
360°
293°
100°
February
198°
190°
088°
039°
187°
March
132°
164°
173°
131°
167°
April
161°
110°
157°
113°
129°
May
143°
180°
127°
158°
June
219°
218°
153°
137°
July
224°
194°
207°
181°
August
212°
159°
196°
019°
September
063°
032°
085°
050°
October
065°
082°
093°
043°
November
039°
050°
043°
050°
December
057°
139°
180°
090°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.