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
84
78
95
77
84
February
80.1
93
81
74
67
83
March
87.4
81
91
89
88
88
April
91.2
85
95
97
94
May
90.4
91
91
97
79
June
92.3
84
98
92
91
July
94.1
96
91
94
95
August
91.1
91
95
94
83
September
90.5
94
90
90
85
October
88.7
97
89
86
83
November
88.7
96
86
99
86
December
82.2
84
76
84
81
Average
88.4
85.6
89.1
90.0
89.6
86.0
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
11.6
12
14
11
11
13
February
15.6
16
18
15
11
14
March
18.1
19
19
20
19
20
April
22.8
23
23
23
22
May
26.3
24
27
26
24
June
29.8
28
32
30
29
July
32.1
32
32
32
33
August
30.8
32
30
32
30
September
28.4
28
28
29
26
October
23.5
24
22
24
23
November
16.9
18
19
17
19
December
13.7
15
12
18
12
Average
21.6
15.5
22.9
22.8
22.6
22.1
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
2.3
1
5
0
2
5
February
5.2
4
7
3
3
6
March
7.3
7
7
7
8
11
April
11.1
10
10
10
11
May
16.0
14
16
15
14
June
19.7
17
19
20
21
July
22.0
21
22
22
23
August
21.2
20
21
21
22
September
17.6
16
16
17
17
October
11.9
10
9
14
13
November
5.5
4
7
4
8
December
3.5
3
4
7
2
Average
11.0
4.1
11.1
11.3
11.8
12.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.9
10
7
5
9
12
February
6.8
4
3
6
11
9
March
6.2
10
5
6
7
4
April
5.7
10
3
2
5
May
4.1
5
2
2
10
June
3.0
6
1
2
3
July
1.7
0
2
3
1
August
3.3
5
2
4
3
September
4.4
1
8
3
7
October
3.6
1
2
3
5
November
5.6
5
7
3
2
December
8.3
8
5
2
7
Average
5.3
7.9
4.6
4.0
3.7
5.4
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
5.3
6
5
6
5
5
February
5.9
7
6
6
5
6
March
6.3
6
6
7
6
6
April
6.3
6
7
7
7
May
5.6
7
6
5
5
June
4.8
5
5
5
5
July
3.6
4
4
4
4
August
3.3
4
4
3
4
September
4.5
4
5
4
6
October
4.1
4
4
4
4
November
4.6
4
6
6
4
December
4.2
4
3
6
5
Average
4.9
6.2
4.9
5.4
4.9
4.9
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
284°
258°
309°
313°
294°
February
266°
243°
245°
319°
247°
March
317°
273°
244°
023°
233°
April
247°
248°
278°
277°
May
028°
256°
275°
298°
June
312°
318°
225°
271°
July
293°
231°
239°
200°
August
303°
269°
177°
224°
September
039°
019°
324°
036°
October
298°
350°
276°
326°
November
033°
034°
321°
268°
December
289°
329°
229°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.