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
1.0
0
4
2
-1
0
February
0.2
2
-1
1
1
0
March
2.8
6
1
3
4
2
April
7.2
7
8
9
6
May
12.0
12
13
13
12
June
18.8
19
19
22
21
July
23.1
25
24
20
23
August
23.6
22
24
24
25
September
19.1
21
19
20
20
October
13.0
16
16
14
5
November
8.6
7
10
10
10
December
3.6
5
6
4
5
Average
10.0
2.7
11.5
12.2
11.7
10.3
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
-5.0
-5
-2
-6
-4
-6
February
-7.5
-4
-7
-6
-4
-6
March
-4.1
-1
-3
-4
-4
-5
April
0.2
0
1
2
0
May
4.0
4
5
4
4
June
11.3
12
12
13
13
July
16.0
19
17
14
16
August
16.7
16
18
17
18
September
12.4
14
13
14
13
October
6.8
9
9
8
0
November
2.6
2
4
4
3
December
-2.4
0
0
-2
-1
Average
3.4
-4.9
5.2
5.3
5.3
3.6
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
15.7
15
15
16
14
15
February
14.5
14
15
15
16
12
March
11.5
14
13
13
14
0
April
10.1
10
12
12
0
May
8.0
12
10
11
0
June
8.0
10
9
10
0
July
8.4
7
10
10
6
August
9.4
10
9
9
11
September
11.4
9
13
12
12
October
12.4
11
10
11
14
November
16.4
15
18
15
14
December
16.5
16
16
17
16
Average
11.6
14.3
11.5
12.0
12.1
7.0
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
287°
315°
279°
326°
324°
February
287°
290°
254°
285°
251°
March
205°
347°
218°
246°
360°
April
278°
314°
073°
360°
May
202°
327°
240°
360°
June
155°
217°
199°
360°
July
193°
218°
215°
209°
August
194°
200°
223°
228°
September
238°
281°
213°
238°
October
260°
231°
318°
278°
November
266°
265°
226°
238°
December
291°
053°
283°
221°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.