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
91.3
96
87
88
87
96
February
87.6
97
89
85
66
92
March
92.3
86
93
94
93
91
April
94.5
93
95
99
95
May
94.0
93
91
95
91
June
95.8
94
98
96
93
July
95.7
95
93
96
97
August
94.2
95
93
90
97
September
94.0
97
93
95
89
October
94.8
97
92
96
92
November
91.5
93
89
98
94
December
90.3
92
97
94
90
Average
93.1
92.5
93.4
92.3
92.5
93.0
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
14.8
16
18
14
14
17
February
18.0
17
20
18
14
17
March
19.8
21
21
22
21
21
April
23.8
25
24
24
23
May
27.5
26
29
28
25
June
30.0
30
31
30
28
July
31.8
32
32
32
33
August
31.2
32
31
31
32
September
29.2
29
29
29
28
October
25.3
25
24
26
26
November
19.7
19
21
19
22
December
16.8
17
16
21
16
Average
23.3
17.8
24.4
24.4
24.0
23.9
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
4.1
4
7
2
5
7
February
6.7
6
9
6
5
6
March
8.6
11
10
9
10
11
April
12.7
14
12
12
12
May
17.5
16
19
16
16
June
20.9
19
21
22
20
July
23.3
23
24
23
24
August
23.2
23
23
23
24
September
19.9
19
20
20
20
October
15.1
13
13
16
17
November
8.5
8
11
7
11
December
6.1
6
6
9
4
Average
13.1
6.8
13.9
14.1
13.8
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.7
5
7
9
10
2
February
7.3
7
7
9
16
9
March
5.6
9
7
9
3
7
April
5.4
9
5
2
5
May
5.2
13
3
3
6
June
4.9
5
3
6
9
July
5.0
6
9
5
4
August
5.0
7
7
5
5
September
5.8
5
8
7
8
October
3.6
5
2
3
5
November
5.5
9
9
1
6
December
9.0
12
5
4
6
Average
5.7
7.3
7.6
6.4
5.0
6.0
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
8.5
9
8
9
8
9
February
8.6
9
9
8
9
9
March
9.5
9
10
10
9
9
April
9.4
9
10
9
10
May
8.7
9
9
9
9
June
7.6
8
7
8
8
July
7.1
6
8
7
6
August
6.5
7
6
6
6
September
7.4
8
8
7
7
October
7.5
8
7
7
7
November
7.6
8
8
8
8
December
7.5
7
7
7
8
Average
8.1
8.8
7.9
8.1
7.7
8.0
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
262°
263°
316°
296°
288°
February
291°
257°
170°
320°
257°
March
287°
283°
219°
344°
244°
April
166°
226°
252°
241°
May
017°
216°
207°
239°
June
205°
126°
187°
213°
July
201°
218°
204°
208°
August
209°
182°
175°
206°
September
348°
054°
060°
023°
October
350°
001°
321°
038°
November
002°
036°
339°
033°
December
332°
008°
258°
287°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.