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
85.2
78
83
97
86
71
February
80.8
91
82
83
78
79
March
91.9
87
91
95
94
84
April
92.6
90
95
94
88
May
94.8
97
95
91
95
June
96.6
95
100
96
97
July
97.7
98
98
98
99
August
95.7
100
87
98
98
September
95.1
96
99
94
89
October
91.1
92
95
97
86
November
90.4
89
86
91
91
December
86.5
95
78
89
85
Average
91.2
85.2
92.5
92.8
92.5
89.0
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
15.5
14
18
17
14
16
February
18.1
22
20
18
13
17
March
22.7
23
24
23
23
23
April
24.9
24
27
25
24
May
29.3
30
31
28
28
June
32.7
34
35
33
32
July
34.5
35
37
34
33
August
34.6
39
34
34
34
September
32.1
34
32
32
30
October
26.4
27
27
29
25
November
20.2
21
20
21
23
December
17.5
18
19
23
17
Average
25.0
19.4
27.0
26.8
25.6
25.0
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
4.7
3
8
3
5
6
February
7.0
10
9
3
2
6
March
11.0
13
11
9
10
14
April
13.1
13
15
13
14
May
18.5
18
20
18
18
June
22.6
23
23
23
22
July
24.2
25
26
24
24
August
24.1
26
25
24
23
September
21.0
22
20
20
21
October
14.7
16
13
17
14
November
8.5
10
9
8
10
December
7.0
6
11
12
5
Average
13.9
8.2
15.6
14.8
14.7
14.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.3
16
13
2
7
10
February
12.4
9
14
18
7
13
March
5.3
9
3
5
6
10
April
4.8
10
5
5
4
May
3.4
2
2
6
5
June
2.5
1
1
4
2
July
1.8
1
3
2
3
August
3.7
0
9
3
3
September
3.9
5
1
4
5
October
5.0
5
3
4
6
November
5.8
7
11
4
3
December
7.3
4
14
2
10
Average
5.8
11.1
5.0
5.7
4.2
5.8
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
8.1
8
9
9
8
7
February
8.3
9
9
8
8
8
March
8.4
7
9
9
9
8
April
8.2
8
9
8
7
May
7.5
6
8
8
8
June
6.8
6
6
6
7
July
6.1
6
6
5
6
August
6.1
7
6
6
6
September
5.9
6
5
6
7
October
7.1
8
7
7
7
November
6.6
6
6
7
7
December
7.3
7
8
8
7
Average
7.3
8.0
7.1
7.2
7.1
7.2
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
292°
223°
311°
300°
141°
February
221°
220°
266°
052°
282°
March
141°
155°
212°
151°
158°
April
089°
170°
142°
116°
May
131°
184°
135°
142°
June
207°
166°
168°
175°
July
221°
206°
212°
181°
August
267°
124°
157°
340°
September
080°
046°
068°
024°
October
185°
183°
224°
080°
November
047°
061°
157°
107°
December
231°
196°
192°
228°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.