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
2.2
1
5
2
2
2
February
1.7
2
2
2
2
3
March
4.0
5
4
6
5
4
April
8.4
9
9
10
7
May
13.1
14
14
13
13
June
17.9
17
17
21
18
July
21.6
22
22
21
21
August
22.1
21
23
23
22
September
19.4
20
20
20
19
October
14.8
16
16
16
14
November
9.3
8
11
10
11
December
4.1
5
5
5
6
Average
10.8
2.7
11.8
12.6
12.4
11.7
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
-7
-3
-4
February
-5.2
-4
-6
-5
-4
-4
March
-2.2
0
-1
-1
-3
-1
April
2.4
3
3
4
1
May
6.2
6
7
7
6
June
11.1
11
12
12
11
July
15.5
17
14
16
16
August
16.1
16
17
17
16
September
13.8
15
14
14
13
October
9.1
10
10
10
8
November
2.8
2
4
3
4
December
-2.6
0
1
-1
2
Average
4.7
-3.6
6.1
6.2
6.1
5.6
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
12.0
13
11
13
11
11
February
12.7
12
12
14
13
11
March
13.3
13
13
13
14
13
April
12.5
11
13
13
13
May
10.8
12
10
11
13
June
9.0
8
8
10
8
July
7.9
8
9
8
7
August
8.4
8
8
8
10
September
9.5
9
10
10
9
October
10.2
9
8
8
11
November
12.5
12
14
13
11
December
12.3
12
13
13
12
Average
10.9
12.6
10.2
10.6
10.9
10.6
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
302°
291°
283°
293°
292°
February
300°
302°
257°
282°
247°
March
257°
343°
269°
254°
282°
April
307°
274°
301°
270°
May
277°
157°
232°
230°
June
139°
176°
197°
144°
July
180°
217°
180°
150°
August
204°
170°
172°
210°
September
202°
258°
191°
198°
October
273°
168°
256°
269°
November
288°
272°
274°
232°
December
290°
006°
292°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.