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
98.5
97
98
100
99
February
98.2
99
98
99
97
March
99.0
99
99
99
99
April
100.0
100
100
100
May
99.8
100
100
100
June
99.5
99
99
100
July
100.0
100
100
100
August
99.2
99
100
98
100
September
99.8
100
100
100
99
October
99.8
100
100
100
100
November
98.9
98
99
99
100
December
99.3
100
100
100
98
Average
99.1
98.1
99.3
99.6
99.3
99.3
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
15.7
16
17
16
15
February
18.0
20
18
16
18
March
22.5
22
23
23
22
April
27.6
27
29
25
May
32.3
31
34
32
June
35.9
36
36
36
July
35.4
38
36
33
August
33.9
36
32
32
37
September
31.6
35
30
32
30
October
26.9
27
24
28
28
November
20.6
20
18
22
23
December
17.8
18
18
21
16
Average
25.1
19.2
27.0
26.2
26.6
26.4
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
0.5
1
2
-1
1
February
1.5
4
2
-2
2
March
6.4
8
7
5
7
April
10.7
10
12
10
May
16.2
16
17
16
June
20.9
20
21
21
July
21.7
23
22
21
August
21.2
22
21
20
23
September
17.2
19
17
18
16
October
11.5
13
11
12
10
November
5.6
7
3
6
7
December
2.3
1
4
6
-1
Average
9.8
4.1
11.6
11.1
12.0
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.9
1
1
1
1
February
2.6
2
1
5
4
March
0.2
0
1
0
0
April
0.1
0
0
1
May
0.2
1
0
0
June
1.0
0
1
2
July
0.6
0
1
1
August
3.3
2
7
3
1
September
0.9
1
1
1
1
October
0.2
0
1
0
0
November
1.6
3
4
0
0
December
1.4
0
2
2
2
Average
1.1
0.8
0.7
1.7
1.3
0.9
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
9.2
10
10
9
9
February
9.4
10
10
9
10
March
10.7
11
11
10
10
April
10.3
10
11
10
May
9.2
9
10
10
June
8.2
8
9
8
July
7.1
7
7
7
August
6.9
7
7
6
7
September
6.9
7
7
7
8
October
8.0
8
7
8
9
November
8.3
8
9
8
9
December
8.0
7
8
9
8
Average
8.6
10.1
8.4
8.4
8.2
8.0
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
261°
252°
291°
258°
February
259°
241°
240°
256°
March
263°
250°
255°
229°
April
282°
271°
297°
May
207°
250°
232°
June
255°
147°
079°
July
097°
123°
087°
August
077°
067°
140°
119°
September
212°
118°
110°
055°
October
197°
220°
236°
311°
November
278°
269°
249°
217°
December
245°
246°
244°
258°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.