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
-4
-5
-3
0
-6
February
-3.3
5
-1
-4
-6
-2
March
4.0
6
-1
4
12
6
April
10.8
9
8
14
11
May
21.8
27
21
22
18
June
28.7
29
30
31
29
July
28.8
28
29
30
29
August
26.6
28
28
28
28
September
23.7
25
26
25
22
October
13.8
15
18
17
10
November
5.7
8
5
8
10
December
0.1
4
-3
1
3
Average
11.7
2.2
13.9
13.8
15.2
13.2
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
-13.1
-12
-13
-16
-8
-14
February
-13.1
-5
-12
-17
-15
-11
March
-6.3
-5
-11
-5
0
-4
April
0.2
-1
0
1
0
May
8.8
12
10
8
7
June
15.8
16
18
16
16
July
16.6
14
18
18
17
August
14.9
15
16
16
15
September
11.1
12
11
12
9
October
3.0
4
4
6
1
November
-5.8
-3
-4
-2
-2
December
-10.8
-4
-11
-9
-9
Average
1.0
-8.7
2.4
2.3
3.7
2.1
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
11.0
10
10
13
10
11
February
11.5
10
12
15
10
11
March
11.9
12
13
13
13
12
April
12.6
13
15
13
12
May
10.8
11
11
11
11
June
10.0
8
12
9
12
July
8.0
8
9
7
8
August
8.0
7
8
8
9
September
8.9
7
9
9
10
October
11.3
10
12
10
12
November
11.4
12
13
11
12
December
10.9
9
13
10
11
Average
10.5
10.9
9.8
11.7
9.9
10.9
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
300°
313°
307°
312°
269°
February
288°
296°
308°
272°
293°
March
332°
331°
331°
191°
303°
April
332°
326°
328°
321°
May
162°
258°
232°
354°
June
141°
253°
244°
172°
July
312°
268°
171°
209°
August
319°
264°
186°
184°
September
062°
221°
244°
288°
October
305°
281°
279°
289°
November
287°
296°
290°
261°
December
293°
298°
288°
314°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.