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
-2.5
-1
1
-3
-1
-2
February
-2.3
0
-3
-1
-2
-2
March
1.6
4
1
2
3
1
April
7.4
8
8
8
6
May
13.9
15
15
13
14
June
19.9
19
20
23
21
July
24.1
26
25
22
24
August
23.9
22
25
25
25
September
19.5
21
20
20
20
October
13.8
15
17
15
13
November
6.5
5
8
8
8
December
1.3
3
3
2
4
Average
9.5
0.7
11.2
11.4
11.2
11.1
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
-9.2
-8
-6
-12
-6
-9
February
-10.5
-7
-12
-10
-8
-10
March
-5.1
-2
-4
-5
-6
-6
April
0.2
0
1
1
0
May
4.8
5
6
4
5
June
11.1
11
12
13
12
July
15.7
18
16
15
16
August
15.6
15
17
16
16
September
11.4
13
12
13
11
October
6.5
8
10
7
6
November
-1.9
-1
2
1
1
December
-5.2
-2
-2
-5
-2
Average
2.0
-6.6
3.9
3.7
3.8
3.2
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
11.7
12
12
12
10
12
February
11.9
12
11
13
11
11
March
12.4
12
11
12
14
12
April
11.9
10
12
13
13
May
11.7
13
11
12
13
June
10.8
11
9
11
11
July
9.2
8
10
9
9
August
9.2
9
9
9
11
September
10.1
9
9
11
12
October
10.4
10
10
9
11
November
12.2
11
13
11
11
December
11.9
13
14
12
12
Average
11.1
12.1
10.5
10.9
11.0
11.3
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
293°
357°
281°
338°
315°
February
315°
310°
269°
296°
257°
March
262°
359°
270°
252°
337°
April
339°
016°
024°
336°
May
285°
142°
006°
241°
June
076°
164°
209°
180°
July
195°
219°
195°
196°
August
202°
184°
214°
245°
September
279°
310°
221°
225°
October
257°
218°
319°
236°
November
274°
270°
270°
235°
December
288°
020°
283°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.