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
7.0
7
8
7
7
6
February
6.2
7
7
8
6
7
March
6.9
8
6
8
7
7
April
8.4
8
8
9
8
May
11.3
12
10
11
11
June
13.4
14
12
14
13
July
15.7
16
16
16
15
August
17.2
17
18
17
16
September
15.0
14
15
14
16
October
12.0
12
14
10
12
November
9.2
10
7
9
9
December
7.1
9
4
4
9
Average
10.4
7.3
11.0
10.7
10.3
10.7
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
5
4
4
2
February
2.8
4
3
5
2
4
March
3.4
4
3
5
4
3
April
5.2
5
4
5
5
May
8.0
8
7
8
8
June
10.4
11
10
11
10
July
12.8
13
13
13
12
August
13.7
14
15
14
13
September
12.0
12
13
11
13
October
8.6
9
10
7
8
November
6.0
7
4
6
6
December
3.9
6
0
1
6
Average
7.2
4.1
7.9
7.5
7.1
7.4
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
14.0
15
15
13
16
12
February
12.1
12
14
11
12
12
March
11.7
12
13
12
13
12
April
12.5
13
13
10
13
May
9.8
10
10
9
11
June
9.3
9
8
10
11
July
7.5
8
8
7
8
August
8.9
8
9
8
10
September
9.9
12
12
11
9
October
10.8
12
11
13
9
November
12.2
12
12
13
13
December
13.2
15
10
12
17
Average
10.9
12.6
11.4
10.6
10.8
11.1
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
143°
153°
161°
163°
168°
February
147°
187°
169°
176°
199°
March
136°
136°
167°
185°
311°
April
157°
133°
190°
148°
May
105°
155°
152°
141°
June
120°
123°
125°
153°
July
075°
132°
121°
160°
August
121°
147°
284°
168°
September
159°
146°
163°
137°
October
151°
191°
163°
213°
November
173°
136°
177°
184°
December
168°
303°
303°
161°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.