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
1.7
1
5
2
2
1
February
0.8
2
0
2
1
1
March
2.5
4
2
3
4
2
April
6.3
7
7
7
5
May
10.3
10
11
11
11
June
15.9
15
16
18
16
July
20.6
22
21
20
20
August
22.2
21
22
22
22
September
19.1
20
19
20
19
October
14.2
15
15
15
14
November
8.9
8
10
10
10
December
3.9
5
5
4
6
Average
9.5
2.0
10.9
11.5
11.1
10.6
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
-4.0
-4
-1
-5
-2
-5
February
-6.7
-3
-6
-5
-4
-5
March
-3.3
-1
-2
-3
-3
-3
April
0.7
1
1
2
0
May
4.0
4
5
4
4
June
9.0
9
10
10
9
July
14.4
16
14
14
15
August
16.7
17
18
17
16
September
14.0
15
14
15
14
October
8.9
10
10
10
8
November
2.9
2
4
5
4
December
-2.7
1
1
-2
1
Average
3.9
-3.5
5.5
5.5
5.5
4.8
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
15.4
15
15
16
15
15
February
15.7
14
15
18
17
13
March
15.2
15
15
14
16
16
April
14.1
13
14
15
15
May
12.9
14
11
12
14
June
11.9
11
11
12
11
July
10.8
10
12
11
9
August
11.2
11
11
11
13
September
12.5
11
13
12
13
October
12.7
12
10
13
13
November
15.5
14
17
15
14
December
15.9
16
17
16
16
Average
13.6
14.7
12.8
13.2
13.5
13.2
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
294°
291°
286°
319°
307°
February
291°
305°
261°
292°
265°
March
204°
327°
258°
253°
313°
April
286°
290°
329°
277°
May
244°
265°
250°
239°
June
162°
200°
211°
207°
July
187°
221°
223°
186°
August
189°
199°
219°
234°
September
228°
272°
217°
218°
October
248°
211°
318°
281°
November
276°
267°
239°
245°
December
279°
016°
283°
240°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.