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
83.9
83
72
93
80
89
February
85.5
96
92
80
79
85
March
89.6
86
89
87
89
86
April
92.4
87
93
94
97
May
94.3
94
98
99
92
June
94.2
89
99
94
93
July
96.2
99
94
96
98
August
94.6
94
91
96
96
September
93.9
97
91
94
90
October
92.0
98
90
89
88
November
90.1
95
83
98
92
December
80.6
81
63
78
90
Average
90.7
88.0
90.6
89.8
91.1
91.4
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
12.4
12
14
11
11
14
February
16.4
17
19
16
13
14
March
19.1
20
20
20
20
20
April
22.9
23
23
23
23
May
26.9
25
29
26
25
June
30.0
28
33
30
29
July
32.1
33
33
31
33
August
31.2
32
31
31
31
September
28.9
29
28
28
27
October
23.8
24
23
23
24
November
17.3
18
18
17
20
December
13.8
14
12
18
13
Average
22.1
16.1
23.2
23.3
22.5
22.6
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
2.5
1
5
1
2
5
February
5.4
4
7
4
3
5
March
7.3
8
7
8
7
10
April
10.4
11
10
9
10
May
15.4
14
17
14
14
June
19.7
18
21
20
20
July
21.8
22
23
22
22
August
21.4
22
22
22
22
September
18.4
18
17
17
18
October
12.6
11
10
14
13
November
6.1
6
8
4
9
December
4.2
4
6
7
2
Average
11.2
4.3
12.0
12.3
11.8
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
14
11
9
10
14
February
10.2
6
10
10
12
18
March
9.1
12
9
12
9
13
April
7.1
16
4
5
5
May
5.8
6
5
5
8
June
5.3
14
1
4
4
July
2.7
2
5
5
3
August
5.3
9
5
6
5
September
4.6
1
7
7
8
October
6.1
1
5
11
7
November
7.4
6
13
4
2
December
12.8
16
16
10
8
Average
7.4
10.6
8.4
6.9
6.9
7.4
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
6.6
7
6
7
7
7
February
6.8
7
7
6
7
7
March
7.2
7
6
8
7
7
April
7.2
8
7
7
7
May
6.7
7
7
7
6
June
6.1
6
6
6
7
July
5.3
5
6
5
5
August
5.2
6
5
5
5
September
5.6
5
6
5
7
October
5.6
6
6
5
5
November
5.6
6
7
6
5
December
6.0
6
5
6
6
Average
6.2
6.9
6.2
6.4
5.9
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
253°
239°
242°
250°
268°
February
222°
235°
220°
283°
239°
March
248°
225°
239°
112°
230°
April
222°
232°
242°
247°
May
067°
214°
226°
236°
June
241°
198°
203°
233°
July
250°
222°
225°
208°
August
221°
199°
175°
215°
September
067°
049°
199°
059°
October
244°
016°
232°
090°
November
073°
100°
251°
033°
December
247°
106°
212°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.