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
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
0.5
-1
2
2
0
0
February
-1.8
1
-2
1
0
0
March
0.7
2
1
1
0
0
April
2.5
4
5
0
0
May
4.5
7
8
0
0
June
7.1
12
13
0
July
9.7
18
17
0
August
10.9
18
19
0
September
10.1
17
17
14
0
October
7.2
12
13
12
0
November
4.2
5
7
9
0
December
2.0
4
4
3
0
Average
3.7
0.7
8.3
9.0
3.9
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
-3.3
-5
-2
-4
0
0
February
-4.6
-3
-8
-5
0
0
March
-2.1
-1
-3
-3
0
0
April
0.1
0
1
0
0
May
1.8
3
4
0
0
June
4.4
7
9
0
July
7.7
14
14
0
August
8.9
15
16
0
September
7.8
13
13
11
0
October
4.6
9
10
8
0
November
1.8
2
3
5
0
December
-1.7
0
0
-1
0
Average
1.4
-4.9
4.3
4.9
2.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
14.9
22
21
24
0
0
February
14.8
22
20
24
0
0
March
13.8
19
21
21
0
0
April
10.7
19
18
0
0
May
8.8
16
13
0
0
June
8.0
14
14
0
July
7.6
11
13
0
August
8.0
11
13
0
September
10.4
15
17
15
0
October
9.3
10
15
17
0
November
13.3
18
24
21
0
December
13.9
23
22
26
0
Average
10.0
20.8
15.9
17.1
8.3
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
275°
282°
223°
360°
360°
February
293°
312°
236°
360°
360°
March
195°
356°
249°
360°
360°
April
322°
322°
360°
360°
May
239°
248°
360°
360°
June
044°
213°
360°
July
186°
225°
360°
August
191°
214°
360°
September
214°
259°
182°
360°
October
128°
254°
331°
360°
November
279°
280°
213°
360°
December
252°
058°
267°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.