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
February
0.0
0
0
March
0.0
0
0
April
0.0
0
0
May
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
5.3
-1
7
4
4
February
4.0
3
6
March
6.5
6
6
April
9.1
9
8
May
12.4
11
12
13
June
14.6
16
15
16
14
July
16.8
17
17
17
16
August
16.6
17
18
17
15
September
14.5
14
15
13
15
October
11.0
12
12
10
10
November
7.8
9
5
9
7
December
5.6
8
2
4
6
Average
9.6
-1.0
12.9
12.2
10.6
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
2.6
-2
5
2
0
February
1.0
1
3
March
3.0
3
3
April
5.3
5
5
May
8.2
7
8
9
June
10.5
11
10
11
10
July
12.5
13
13
13
12
August
12.6
13
13
12
12
September
11.1
11
11
11
11
October
7.9
9
9
7
7
November
5.0
6
3
5
4
December
2.9
4
-1
1
5
Average
6.4
-2.4
9.3
8.5
7.2
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
February
0.0
0
0
March
0.0
0
0
April
0.0
0
0
May
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
19.0
33
25
22
0
February
16.7
25
7
March
13.4
13
18
April
11.2
14
13
May
7.6
8
6
12
June
6.3
9
8
0
10
July
5.5
6
8
0
9
August
7.0
8
8
0
12
September
9.3
12
10
7
12
October
13.5
15
16
21
14
November
17.6
19
24
22
20
December
16.8
21
20
20
15
Average
13.6
33.0
12.4
11.7
9.3
11.4
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
060°
068°
049°
360°
February
066°
169°
March
179°
101°
April
098°
114°
May
150°
146°
093°
June
229°
157°
360°
160°
July
180°
178°
360°
176°
August
190°
194°
360°
163°
September
132°
130°
148°
101°
October
086°
162°
118°
068°
November
112°
066°
144°
102°
December
114°
061°
107°
083°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.