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
84.3
83
78
95
86
84
February
81.4
87
84
81
86
80
March
91.0
82
93
91
96
85
April
93.1
90
92
95
94
May
93.3
95
87
93
94
June
94.8
95
94
94
96
July
95.1
94
96
97
98
August
91.3
99
72
95
94
September
93.2
94
93
93
90
October
91.7
95
94
92
91
November
87.1
84
81
88
91
December
86.0
92
81
92
91
Average
89.8
83.9
91.4
88.1
92.2
90.9
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
14.8
13
17
16
14
15
February
17.9
20
20
17
13
17
March
22.1
22
23
22
23
24
April
24.4
24
25
24
24
May
29.1
30
31
27
28
June
32.3
33
34
32
32
July
34.0
35
36
33
34
August
34.1
38
33
34
34
September
31.9
33
32
31
31
October
26.3
28
27
28
25
November
19.8
20
20
20
22
December
17.3
18
19
22
16
Average
24.5
18.2
26.6
26.1
25.0
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
3.9
2
5
2
5
7
February
7.0
9
9
4
3
6
March
10.9
11
12
9
11
14
April
12.8
13
13
12
13
May
17.9
18
17
17
17
June
21.8
22
22
22
22
July
23.5
24
25
23
24
August
22.8
25
23
24
20
September
20.0
21
19
20
19
October
13.9
15
12
15
14
November
7.6
8
8
6
9
December
6.5
5
10
11
4
Average
13.3
7.2
14.7
13.7
14.0
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
8.0
10
10
4
5
13
February
8.9
7
9
10
5
13
March
7.2
11
4
9
5
9
April
4.9
8
6
6
3
May
4.0
3
3
7
3
June
4.3
2
3
5
5
July
3.1
3
2
2
4
August
4.6
1
10
6
2
September
3.7
4
0
4
9
October
5.0
6
1
3
9
November
5.9
9
7
4
4
December
7.3
6
5
4
8
Average
5.9
9.6
5.1
5.0
4.5
6.6
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
7.4
7
8
8
8
7
February
7.8
8
8
8
7
8
March
7.4
6
7
7
8
8
April
6.9
7
8
6
7
May
6.0
5
6
6
7
June
5.7
5
5
5
6
July
5.2
5
6
5
5
August
4.9
6
4
5
5
September
4.7
4
5
4
6
October
6.0
6
6
6
6
November
5.8
6
5
6
5
December
6.6
6
7
8
7
Average
6.3
7.0
6.1
6.2
6.0
6.2
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
352°
243°
331°
310°
360°
February
237°
230°
293°
034°
325°
March
054°
185°
273°
133°
166°
April
031°
186°
090°
017°
May
043°
198°
126°
182°
June
253°
032°
160°
185°
July
261°
219°
216°
220°
August
335°
118°
047°
357°
September
020°
017°
049°
029°
October
317°
233°
241°
014°
November
008°
033°
348°
010°
December
264°
226°
204°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.