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
86.6
77
98
94
94
94
February
90.6
84
97
98
92
99
March
93.5
95
93
96
97
92
April
97.1
98
98
97
98
98
May
97.6
97
97
99
98
June
98.3
98
96
98
99
July
98.8
98
99
99
98
August
95.0
86
98
97
99
September
90.1
93
90
87
75
October
97.3
96
98
97
97
November
93.0
95
86
96
95
December
90.0
92
91
90
92
Average
93.8
88.6
95.1
95.4
95.4
94.6
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
6.8
7
7
9
7
8
February
8.4
10
9
12
7
11
March
11.2
12
8
15
13
12
April
15.8
16
16
14
19
17
May
21.3
23
19
22
21
June
25.7
27
25
29
25
July
32.1
33
33
34
31
August
31.4
32
34
31
31
September
25.5
25
27
27
28
October
18.7
20
22
17
21
November
11.1
12
8
13
11
December
6.5
9
3
7
8
Average
17.1
11.1
18.3
18.8
18.8
18.6
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
-3.4
-4
-3
-2
-2
0
February
-3.1
-1
-2
-4
-3
-3
March
-2.9
-1
-3
1
-1
-2
April
1.5
1
2
0
1
2
May
5.8
7
4
5
5
June
8.9
9
9
12
9
July
12.6
12
14
15
11
August
12.7
14
14
12
12
September
8.2
8
9
8
9
October
3.1
3
5
4
4
November
-1.7
0
-3
3
0
December
-3.4
0
-6
-2
-2
Average
3.1
-2.6
4.0
3.7
4.4
3.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.2
17
3
4
5
8
February
7.9
9
1
3
6
0
March
5.4
7
10
4
1
8
April
4.1
5
3
6
0
3
May
3.9
4
4
3
5
June
1.9
1
6
2
2
July
0.5
0
1
3
0
August
0.5
2
0
0
0
September
2.6
6
2
4
0
October
1.6
2
1
3
1
November
6.4
5
11
5
8
December
6.6
7
12
15
3
Average
4.5
9.1
3.4
3.9
3.4
2.9
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
6.3
6
7
6
6
9
February
6.7
5
7
7
8
7
March
7.1
8
7
7
7
7
April
7.0
6
8
7
7
6
May
6.1
5
8
7
6
June
5.9
5
6
6
6
July
5.1
5
5
5
5
August
5.1
5
5
5
5
September
5.1
6
5
6
5
October
5.9
5
5
7
6
November
6.7
6
8
8
7
December
6.1
6
4
8
7
Average
6.1
6.4
5.9
6.2
6.5
6.4
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
214°
172°
180°
188°
206°
February
224°
229°
253°
272°
250°
March
217°
201°
255°
233°
260°
April
297°
249°
263°
315°
287°
May
356°
256°
318°
279°
June
328°
284°
292°
300°
July
325°
299°
326°
310°
August
319°
298°
333°
305°
September
275°
294°
265°
275°
October
250°
277°
228°
269°
November
218°
204°
214°
215°
December
189°
178°
213°
198°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.