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
97.1
97
97
99
99
95
February
97.1
96
98
97
98
92
March
97.9
98
97
95
100
99
April
98.4
100
100
100
95
May
99.3
98
100
100
100
June
99.0
100
98
99
100
July
99.6
100
100
99
100
August
99.1
100
99
99
100
September
98.1
98
99
98
100
October
98.7
99
98
100
100
November
96.5
97
97
99
96
December
98.2
97
100
100
99
Average
98.1
97.1
98.3
98.3
99.1
97.6
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
9.1
9
8
10
10
10
February
11.6
13
10
10
11
11
March
16.2
15
13
16
16
17
April
21.2
20
23
21
21
May
26.0
24
28
27
28
June
31.4
31
29
33
32
July
32.1
34
31
30
33
August
30.1
31
28
30
27
September
27.4
28
28
29
19
October
20.5
23
17
21
21
November
14.7
14
11
18
14
December
10.1
9
8
13
10
Average
19.7
11.8
20.0
20.3
21.4
20.0
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
-7.0
-7
-7
-8
-8
-6
February
-6.2
-4
-7
-11
-6
-5
March
-3.3
-2
-3
-5
-4
-1
April
0.9
-2
2
1
1
May
5.1
5
6
6
6
June
10.4
9
11
12
10
July
14.0
14
14
15
14
August
13.0
12
12
12
27
September
9.1
8
7
10
17
October
2.2
0
3
2
3
November
-5.9
-5
-8
-4
-3
December
-7.3
-6
-6
-5
-9
Average
1.4
-5.6
1.3
1.7
2.4
2.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.5
4
3
1
1
6
February
3.5
3
4
5
3
7
March
3.2
4
5
6
1
4
April
1.8
1
0
0
3
May
1.4
3
0
2
0
June
3.2
1
11
6
1
July
1.8
1
2
3
3
August
2.1
1
5
2
0
September
2.5
2
2
3
0
October
3.2
1
10
1
1
November
1.8
4
1
0
0
December
2.6
5
2
3
1
Average
2.6
3.4
2.5
3.8
2.0
2.7
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
8.4
9
9
7
9
8
February
10.1
10
10
7
11
9
March
10.3
11
12
8
11
10
April
10.8
11
12
11
10
May
9.4
8
11
10
8
June
7.5
9
7
7
8
July
5.7
6
5
5
7
August
5.7
7
5
5
5
September
5.8
7
5
5
5
October
7.7
7
7
8
8
November
7.5
6
9
6
9
December
7.9
7
8
9
8
Average
8.4
9.9
8.1
7.7
8.1
8.7
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
281°
274°
293°
293°
299°
February
272°
260°
261°
275°
289°
March
253°
253°
255°
248°
240°
April
264°
256°
233°
258°
May
207°
240°
204°
240°
June
244°
211°
282°
245°
July
215°
219°
154°
266°
August
209°
072°
221°
281°
September
246°
168°
244°
331°
October
231°
271°
258°
266°
November
288°
242°
293°
255°
December
303°
276°
268°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.