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
-2.6
-1
1
-3
-1
-2
February
-3.6
0
-4
-2
-2
-3
March
0.5
2
0
0
3
0
April
4.0
5
5
0
4
May
9.5
11
13
0
12
June
14.8
16
17
0
20
July
22.1
24
24
17
22
August
22.6
21
23
24
23
September
18.2
19
19
19
19
October
13.0
15
14
13
13
November
5.8
6
7
8
8
December
1.5
3
3
2
3
Average
8.0
0.2
9.6
10.3
7.0
9.8
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
-7.5
-6
-4
-10
-4
-7
February
-9.6
-5
-10
-9
-6
-9
March
-5.5
-2
-4
-5
-5
-5
April
-1.9
0
1
0
0
May
4.2
5
6
0
5
June
9.2
10
12
0
13
July
16.0
19
17
12
17
August
17.2
16
18
18
17
September
13.3
15
14
14
13
October
7.8
10
10
10
7
November
0.6
1
3
4
2
December
-3.5
-1
-1
-3
-2
Average
2.9
-5.7
4.8
5.0
3.4
4.3
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
15.0
18
16
16
14
15
February
14.4
15
14
15
16
13
March
13.4
14
12
13
13
14
April
10.6
11
13
0
14
May
10.2
14
10
0
13
June
9.3
12
10
0
11
July
9.5
9
11
8
9
August
10.6
10
10
10
13
September
12.6
12
13
14
13
October
13.4
14
12
12
14
November
17.4
17
19
17
14
December
17.5
17
19
19
16
Average
12.6
15.5
12.8
12.6
9.0
12.9
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
282°
335°
289°
325°
312°
February
307°
290°
280°
287°
253°
March
312°
348°
269°
256°
328°
April
288°
350°
360°
329°
May
282°
200°
360°
246°
June
069°
125°
360°
167°
July
175°
225°
240°
176°
August
205°
183°
241°
256°
September
355°
293°
260°
245°
October
280°
223°
325°
265°
November
279°
277°
282°
257°
December
295°
022°
278°
280°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.