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
91.6
86
95
79
96
95
February
94.0
93
97
99
93
91
March
96.9
100
91
98
99
April
96.6
98
98
96
94
May
92.8
94
97
89
99
June
94.0
88
95
94
96
July
90.2
93
93
76
92
August
88.3
91
93
83
94
September
89.5
93
94
93
69
October
92.3
92
93
95
84
November
92.4
99
96
86
91
December
91.9
88
98
96
91
Average
92.2
89.2
94.5
93.6
90.8
91.2
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
7.3
7
8
7
9
8
February
6.9
8
7
7
7
8
March
8.9
9
9
10
8
April
11.2
11
10
12
12
May
13.2
15
12
13
8
June
16.2
16
17
19
15
July
16.8
18
18
16
14
August
15.9
20
20
18
2
September
16.4
16
18
15
17
October
12.4
13
15
12
12
November
9.0
9
8
10
10
December
7.0
9
5
5
8
Average
11.3
7.4
12.5
12.2
12.1
10.0
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
3.8
4
5
4
4
4
February
3.2
6
3
4
3
4
March
4.2
4
5
4
4
April
6.3
6
5
6
7
May
8.3
10
8
8
5
June
9.7
10
10
11
6
July
10.1
12
12
12
1
August
10.2
12
12
12
0
September
10.6
11
11
10
10
October
6.9
9
9
8
2
November
5.3
6
4
6
5
December
3.9
6
3
2
4
Average
6.6
4.4
7.6
7.2
7.0
4.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.4
18
5
9
13
23
February
14.1
16
13
7
15
14
March
8.4
7
10
10
8
April
8.2
7
10
6
5
May
6.0
6
11
3
8
June
4.7
4
6
5
8
July
1.4
2
3
0
2
August
1.2
2
0
2
1
September
6.2
4
0
11
8
October
9.7
9
7
15
9
November
14.8
6
12
30
17
December
11.8
13
6
13
14
Average
8.8
16.7
6.4
6.6
9.3
8.9
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
4.7
5
4
5
5
7
February
5.8
4
6
5
8
6
March
4.7
5
4
5
5
April
5.6
6
6
5
5
May
6.7
7
7
7
7
June
7.0
8
6
7
7
July
8.1
9
7
10
8
August
6.9
7
6
8
6
September
4.4
4
5
4
4
October
4.2
3
4
4
6
November
5.0
5
5
6
5
December
4.6
5
4
7
4
Average
5.7
4.3
5.8
5.6
6.4
5.8
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
276°
060°
282°
273°
281°
February
050°
294°
007°
296°
286°
March
328°
302°
301°
321°
April
301°
293°
295°
303°
May
291°
299°
294°
291°
June
292°
291°
289°
289°
July
289°
287°
290°
285°
August
292°
289°
289°
291°
September
294°
279°
289°
268°
October
352°
278°
325°
287°
November
293°
319°
276°
266°
December
291°
049°
306°
343°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.