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
97.4
98
93
100
100
100
February
96.4
82
98
99
99
100
March
99.7
99
100
100
100
100
April
99.6
100
100
100
98
May
99.6
98
100
100
100
June
99.5
99
100
99
100
July
99.4
99
100
99
99
August
99.7
100
99
100
100
September
95.3
99
99
74
100
October
98.6
100
100
100
100
November
99.5
100
100
100
100
December
98.2
97
94
97
100
Average
98.2
93.7
98.2
99.1
97.4
99.7
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
18.8
18
18
19
20
19
February
20.1
19
19
20
23
20
March
24.1
22
22
25
24
23
April
29.8
29
31
31
29
May
33.4
33
35
35
36
June
38.4
37
38
41
39
July
38.1
41
36
36
39
August
36.7
38
34
35
40
September
35.2
37
35
34
37
October
30.2
32
28
29
34
November
24.7
25
22
26
27
December
19.7
21
17
20
20
Average
28.0
19.8
29.2
28.3
29.2
30.2
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
4
3
3
3
4
February
4.8
7
3
2
5
5
March
8.2
7
7
7
8
10
April
12.1
11
11
13
12
May
15.6
14
15
16
17
June
21.0
17
24
23
23
July
24.9
26
25
24
24
August
24.4
26
23
23
26
September
21.3
20
22
21
22
October
13.9
14
14
12
14
November
9.0
11
4
9
10
December
5.1
5
4
6
4
Average
12.7
5.8
13.0
13.2
13.3
14.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.7
0
4
0
1
0
February
1.7
1
4
2
0
0
March
0.0
0
0
0
0
0
April
0.2
0
0
1
0
May
0.4
2
0
0
0
June
0.2
1
0
0
0
July
0.6
1
0
0
1
August
0.3
0
2
0
0
September
0.2
0
1
0
0
October
0.2
0
0
0
0
November
0.3
0
0
0
0
December
1.3
0
8
1
0
Average
0.4
0.1
1.2
1.0
0.3
0.1
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
6.3
5
7
6
8
6
February
7.4
6
10
8
7
7
March
7.0
7
7
7
9
7
April
7.3
6
7
8
7
May
7.2
7
7
7
6
June
6.4
6
6
8
7
July
4.9
6
5
2
6
August
4.9
5
5
4
6
September
6.1
6
7
5
7
October
6.6
6
7
6
6
November
6.4
8
7
5
8
December
6.1
6
5
4
8
Average
6.4
6.1
6.6
6.4
6.2
6.6
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
057°
262°
066°
122°
332°
February
247°
192°
146°
279°
328°
March
237°
282°
248°
242°
213°
April
269°
244°
232°
237°
May
217°
228°
229°
248°
June
242°
207°
264°
236°
July
298°
299°
319°
303°
August
056°
328°
304°
318°
September
268°
101°
028°
059°
October
117°
110°
248°
183°
November
095°
269°
079°
105°
December
082°
298°
161°
080°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.