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
98.3
98
98
100
100
97
February
97.7
97
100
95
97
97
March
98.8
99
98
98
100
100
April
99.0
100
100
100
96
May
99.9
100
100
100
100
June
98.7
100
97
100
100
July
100.0
100
100
100
100
August
99.6
100
100
100
100
September
99.7
100
100
99
100
October
98.9
100
96
100
100
November
97.6
96
100
100
100
December
97.5
97
94
100
97
Average
98.8
98.0
99.0
98.6
99.5
98.8
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
8.0
7
7
9
8
8
February
11.2
12
10
9
11
11
March
16.0
15
13
16
15
16
April
21.1
21
23
20
22
May
25.7
25
28
25
28
June
31.1
30
30
31
32
July
32.6
36
32
30
33
August
31.1
32
30
30
33
September
28.1
28
29
28
27
October
20.2
23
19
20
23
November
13.7
13
12
16
15
December
8.1
9
8
9
7
Average
19.5
11.2
20.6
20.7
20.4
21.0
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
-6.7
-5
-6
-7
-6
-5
February
-5.8
-3
-6
-8
-5
-4
March
-1.9
-1
-2
-2
-2
1
April
3.6
1
3
3
4
May
8.0
8
9
9
9
June
13.3
12
14
15
13
July
16.7
18
17
17
17
August
15.5
16
14
15
16
September
11.6
12
11
12
10
October
4.7
5
5
4
4
November
-2.4
-1
-5
-1
0
December
-5.3
-4
-5
-4
-7
Average
3.9
-3.3
4.6
4.2
4.9
4.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.5
4
1
1
2
3
February
2.8
2
2
5
6
5
March
3.2
2
9
4
1
3
April
1.6
0
0
1
4
May
1.2
2
0
1
0
June
1.8
1
5
3
1
July
0.7
0
1
1
2
August
1.5
3
3
1
0
September
1.5
2
1
3
1
October
1.8
0
4
0
2
November
1.8
4
0
0
0
December
2.0
3
3
0
1
Average
1.9
2.7
2.1
2.1
1.3
1.8
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
6.8
6
8
5
7
8
February
8.6
9
9
6
9
8
March
9.3
9
9
9
10
9
April
9.9
9
11
9
10
May
8.8
8
10
9
9
June
7.7
8
7
7
9
July
6.1
7
6
6
6
August
6.1
7
6
6
6
September
6.2
6
5
5
7
October
7.2
7
7
8
6
November
6.2
5
7
5
7
December
6.7
6
7
7
7
Average
7.6
7.7
7.3
7.1
7.4
7.7
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
290°
257°
299°
259°
301°
February
262°
250°
299°
269°
263°
March
229°
239°
259°
250°
224°
April
255°
249°
240°
256°
May
188°
231°
192°
212°
June
225°
187°
146°
200°
July
208°
179°
156°
229°
August
182°
105°
166°
216°
September
196°
150°
212°
111°
October
211°
268°
266°
213°
November
243°
274°
301°
213°
December
314°
266°
243°
325°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.