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
0
July
0.0
0
0
0
0
August
0.0
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
2.1
1
6
2
2
1
February
0.5
1
0
1
1
1
March
2.2
3
3
3
3
3
April
5.8
7
6
7
5
May
9.0
9
10
9
8
June
13.0
13
14
14
12
July
17.7
19
17
18
18
August
20.0
20
21
20
19
September
18.5
19
19
19
18
October
14.0
15
15
15
13
November
8.6
7
10
10
10
December
4.0
5
5
4
6
Average
9.2
1.4
10.2
10.5
10.1
9.5
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
-4.0
-4
-1
-5
-2
-5
February
-6.8
-4
-7
-5
-4
-5
March
-3.5
-1
-2
-2
-3
-2
April
1.2
1
2
2
1
May
4.3
4
5
5
4
June
8.7
9
10
9
9
July
13.6
15
12
14
15
August
15.7
16
17
16
15
September
14.0
14
15
15
14
October
9.3
10
11
10
9
November
3.1
2
4
5
4
December
-2.9
0
1
-2
1
Average
4.4
-3.1
5.3
5.4
5.4
4.8
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
0
July
0.0
0
0
0
0
August
0.0
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
16.4
17
17
18
16
16
February
16.0
16
17
17
16
14
March
16.1
18
15
14
17
16
April
14.7
12
15
16
16
May
13.4
14
12
13
15
June
11.7
13
11
12
11
July
10.4
10
11
11
9
August
11.1
11
11
10
13
September
13.2
12
13
13
14
October
13.4
12
11
14
14
November
16.5
14
17
16
16
December
16.8
18
19
17
17
Average
14.0
16.9
13.5
13.5
13.8
13.8
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
314°
308°
289°
348°
335°
February
311°
319°
252°
297°
254°
March
199°
356°
256°
260°
338°
April
309°
300°
030°
246°
May
270°
289°
231°
245°
June
131°
213°
225°
213°
July
202°
227°
215°
205°
August
201°
198°
224°
233°
September
215°
267°
218°
224°
October
253°
214°
333°
238°
November
284°
268°
256°
244°
December
283°
031°
295°
248°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.