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
93.3
95
94
91
97
February
97.3
93
98
98
97
March
97.5
98
96
97
99
April
95.2
98
99
12
May
98.7
98
99
98
89
June
98.8
100
98
98
100
July
98.0
97
99
97
August
97.7
97
97
99
96
September
84.2
99
98
68
October
77.3
98
91
94
0
November
82.7
98
99
94
0
December
91.3
89
88
84
Average
93.1
95.3
96.8
96.2
92.3
93.2
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
15.0
16
15
16
14
February
16.1
16
15
19
16
March
17.5
17
15
19
17
April
19.3
19
20
6
May
21.0
20
23
22
17
June
22.8
21
26
22
16
July
23.0
24
23
16
August
24.4
26
25
24
18
September
21.1
23
27
18
October
18.1
24
21
19
15
November
16.2
20
17
19
11
December
14.9
16
13
13
Average
18.6
16.1
19.9
20.5
18.1
16.2
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
7.3
8
8
6
8
February
7.0
8
5
6
8
March
8.4
9
7
8
7
April
9.6
9
10
1
May
12.0
12
11
10
15
June
14.2
13
15
15
15
July
15.2
15
15
15
August
16.2
17
16
16
17
September
13.4
14
16
16
October
10.9
13
13
15
14
November
7.9
9
6
10
9
December
6.7
8
5
7
Average
10.8
8.3
10.9
10.2
10.4
14.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.5
3
3
0
3
February
5.5
6
5
0
0
March
5.7
4
7
2
1
April
1.6
0
1
0
May
0.6
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
0
September
0.1
0
0
0
October
0.0
0
0
0
0
November
2.6
1
1
0
0
December
4.1
2
12
5
Average
2.1
4.2
1.2
1.0
0.8
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
4.8
5
6
3
6
February
5.5
6
5
4
4
March
6.2
7
6
6
6
April
6.4
7
7
0
May
7.3
7
8
7
2
June
7.1
7
7
8
2
July
7.0
7
7
2
August
6.7
7
7
7
1
September
5.3
6
6
1
October
4.2
5
5
5
0
November
3.8
5
4
4
0
December
4.1
4
3
5
Average
5.3
5.6
6.1
5.7
5.8
1.8
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
084°
077°
001°
017°
February
123°
336°
339°
327°
March
356°
189°
338°
343°
April
342°
332°
345°
May
348°
338°
344°
054°
June
343°
344°
344°
137°
July
344°
344°
111°
August
348°
345°
343°
104°
September
343°
344°
150°
October
340°
343°
340°
360°
November
345°
330°
341°
360°
December
064°
083°
039°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.