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
98.4
100
96
100
99
98
February
97.5
94
98
99
100
100
March
99.4
99
100
99
99
99
April
99.9
100
100
100
100
May
99.8
100
100
100
100
June
99.3
100
98
100
100
July
99.1
99
98
99
100
August
99.3
100
97
100
100
September
99.4
100
100
99
100
October
99.4
100
99
100
100
November
99.3
100
99
100
100
December
96.9
98
92
99
100
Average
98.9
97.6
99.2
98.6
99.6
99.6
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
15.9
15
15
16
16
17
February
17.2
18
16
17
18
17
March
20.7
19
19
21
20
19
April
25.7
26
27
25
25
May
29.1
28
31
30
31
June
33.9
33
33
35
34
July
32.7
36
32
30
33
August
31.8
34
29
30
35
September
30.4
32
30
29
32
October
26.1
28
23
26
29
November
21.3
21
18
23
23
December
16.3
18
15
18
16
Average
24.2
17.5
25.4
24.4
25.0
25.9
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
2.6
3
2
3
2
3
February
3.7
5
2
2
4
4
March
6.7
7
6
6
5
7
April
10.9
10
12
12
10
May
14.2
13
15
15
16
June
19.2
18
20
21
18
July
20.5
23
19
20
21
August
19.7
21
19
19
21
September
17.9
19
17
18
18
October
12.3
14
11
11
14
November
7.6
8
5
9
8
December
3.7
5
4
6
2
Average
10.8
4.9
11.7
11.1
11.9
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.0
2
12
3
2
4
February
4.8
10
8
2
0
5
March
1.3
1
2
1
1
4
April
0.0
0
0
0
0
May
0.7
1
0
1
1
June
0.6
0
1
0
0
July
3.2
2
4
5
4
August
2.1
2
4
1
3
September
1.4
1
1
5
0
October
0.6
0
1
0
0
November
1.0
0
0
0
1
December
4.1
5
13
3
0
Average
2.2
4.4
2.6
2.0
1.4
1.7
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
6.7
7
8
7
7
6
February
8.4
8
11
9
9
8
March
9.0
9
10
9
10
8
April
9.0
8
10
10
8
May
8.5
8
9
8
7
June
7.8
10
7
8
9
July
5.9
6
6
6
6
August
5.2
6
5
5
5
September
6.2
6
7
5
6
October
6.6
7
6
7
6
November
6.0
7
7
4
7
December
5.7
5
5
6
7
Average
7.2
8.1
7.7
7.3
7.1
6.9
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
255°
239°
188°
175°
280°
February
233°
216°
191°
270°
256°
March
231°
243°
250°
231°
208°
April
244°
241°
250°
246°
May
205°
242°
233°
237°
June
237°
248°
287°
232°
July
286°
279°
254°
296°
August
152°
008°
295°
268°
September
230°
115°
258°
055°
October
184°
188°
225°
250°
November
207°
219°
128°
196°
December
157°
244°
219°
150°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.