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
-5.8
-3
-3
-7
-3
-5
February
-5.9
-1
-5
-5
-3
-3
March
-1.8
2
0
-1
1
-1
April
4.5
5
5
6
4
May
11.1
12
12
11
12
June
17.0
16
17
20
17
July
20.6
21
21
19
21
August
19.9
18
20
22
20
September
15.6
17
15
17
17
October
10.6
13
13
11
9
November
3.4
3
4
5
6
December
-1.3
2
1
-1
2
Average
6.8
-1.3
8.3
8.2
8.8
8.2
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
-11.5
-9
-8
-14
-6
-10
February
-12.8
-9
-14
-13
-8
-10
March
-7.9
-4
-4
-7
-6
-7
April
-1.2
0
0
1
-1
May
4.3
5
4
5
5
June
9.9
10
10
11
10
July
14.1
15
14
13
15
August
14.0
13
15
15
14
September
9.5
12
10
11
8
October
5.1
8
6
6
4
November
-2.2
-2
-1
1
-1
December
-7.9
-4
-3
-6
-4
Average
0.6
-8.9
2.5
2.0
3.1
1.8
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
12.5
12
10
14
12
11
February
12.9
12
14
12
13
12
March
12.4
11
10
13
15
13
April
11.3
11
12
9
11
May
10.2
11
10
9
11
June
8.3
8
9
9
7
July
7.8
7
9
8
7
August
7.6
8
7
6
9
September
9.2
6
9
10
10
October
10.0
8
9
8
11
November
12.4
12
13
12
11
December
13.4
12
14
14
13
Average
10.5
11.4
9.4
10.6
10.0
10.3
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
291°
293°
270°
293°
301°
February
286°
278°
285°
291°
275°
March
304°
294°
279°
285°
272°
April
277°
290°
313°
285°
May
288°
264°
291°
278°
June
145°
228°
267°
273°
July
260°
269°
278°
239°
August
252°
259°
278°
266°
September
296°
287°
268°
248°
October
304°
261°
287°
258°
November
280°
294°
286°
271°
December
295°
001°
271°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.