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
4.5
4
5
4
6
3
February
4.2
6
4
6
3
6
March
6.3
0
7
8
7
7
April
10.8
10
9
12
11
May
15.7
18
12
14
16
June
17.5
19
17
20
16
July
19.9
21
20
20
19
August
20.3
22
21
20
18
September
16.6
17
18
15
18
October
11.7
12
14
10
11
November
7.0
7
5
8
7
December
4.1
7
1
1
6
Average
10.6
2.9
12.3
11.7
11.3
11.4
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
1.5
1
3
1
3
-1
February
0.0
-2
1
2
-1
2
March
2.0
0
2
4
3
2
April
4.9
4
4
5
6
May
9.0
10
7
8
10
June
11.3
11
11
13
11
July
13.4
14
12
14
13
August
14.3
15
15
14
13
September
12.0
11
13
11
13
October
7.7
8
10
7
8
November
3.9
4
1
4
4
December
1.2
4
-3
-2
3
Average
6.0
-1.6
7.2
6.7
6.6
6.9
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
17.2
23
15
14
15
19
February
15.6
17
13
11
17
8
March
12.2
13
15
9
9
15
April
10.3
9
12
10
11
May
8.5
9
7
8
11
June
8.1
9
9
9
7
July
7.5
8
7
8
7
August
7.5
7
8
8
6
September
8.6
8
8
6
10
October
10.6
13
9
10
11
November
13.9
11
22
12
9
December
16.2
11
23
20
15
Average
11.5
16.9
10.3
10.5
10.4
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
047°
049°
052°
048°
053°
February
047°
062°
064°
055°
098°
March
049°
052°
053°
073°
046°
April
068°
047°
054°
052°
May
212°
210°
205°
056°
June
234°
095°
068°
204°
July
232°
214°
228°
221°
August
218°
233°
227°
203°
September
127°
057°
169°
059°
October
057°
097°
047°
063°
November
055°
049°
060°
062°
December
049°
047°
046°
047°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.