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
-1.8
1
1
-2
0
1
February
0.8
3
2
0
-1
1
March
3.4
6
3
4
5
5
April
8.3
10
9
10
8
May
14.3
14
17
15
14
June
19.6
21
20
21
21
July
23.6
25
25
23
27
August
24.8
23
26
26
26
September
21.3
22
21
22
21
October
14.9
15
15
17
14
November
7.6
8
9
8
10
December
3.0
6
3
5
3
Average
10.7
3.0
12.5
12.4
12.5
12.5
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
-7.1
-4
-4
-13
-6
-5
February
-6.1
-4
-6
-8
-8
-5
March
-3.2
0
-3
-3
-2
-1
April
2.1
3
2
3
2
May
7.1
7
9
7
7
June
12.6
14
13
14
13
July
16.6
18
17
16
19
August
17.5
16
18
19
17
September
13.6
14
14
14
13
October
8.5
10
8
12
7
November
1.2
2
3
1
4
December
-3.2
1
-2
-1
-2
Average
4.1
-3.4
6.0
4.9
5.8
5.6
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
13.2
15
11
13
11
12
February
13.6
12
14
16
12
13
March
12.2
13
12
11
12
12
April
11.6
11
12
10
13
May
9.0
8
8
9
10
June
8.2
8
9
8
8
July
7.9
7
9
8
9
August
8.7
9
8
8
9
September
9.4
8
9
10
11
October
12.1
12
11
11
13
November
13.5
14
11
13
13
December
13.9
13
15
14
16
Average
11.1
13.1
10.3
10.5
10.2
11.2
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
266°
297°
276°
300°
268°
February
236°
235°
301°
278°
258°
March
267°
279°
261°
254°
180°
April
230°
249°
303°
262°
May
262°
106°
271°
253°
June
048°
242°
227°
221°
July
250°
238°
341°
232°
August
242°
230°
218°
239°
September
206°
256°
222°
205°
October
258°
213°
062°
231°
November
244°
244°
264°
229°
December
296°
216°
234°
253°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.