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
98.8
100
100
97
98
February
97.3
99
96
95
99
March
98.8
99
97
100
98
April
99.2
99
100
100
May
99.4
100
99
100
98
June
99.8
100
100
99
100
July
97.4
98
99
97
92
August
97.9
99
100
90
99
September
98.0
99
97
100
93
October
98.8
100
100
98
99
November
99.1
99
100
99
December
97.4
100
96
99
Average
98.6
99.4
99.0
99.0
97.6
97.0
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
10.4
11
9
10
10
February
10.7
12
10
11
12
March
15.0
15
11
17
14
April
20.9
21
21
22
May
24.4
24
25
26
27
June
30.9
27
32
34
31
July
35.8
37
36
36
36
August
34.1
33
34
35
35
September
29.2
28
31
30
31
October
21.2
22
27
21
24
November
14.3
14
16
14
December
8.3
11
8
8
Average
20.7
12.7
21.9
24.2
21.7
24.3
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
-2.2
-1
-3
-3
-3
February
-2.3
0
-2
-4
-1
March
1.9
2
0
3
1
April
5.7
5
6
6
May
9.6
9
8
10
12
June
14.5
13
15
17
14
July
17.8
17
20
21
16
August
16.0
16
19
17
18
September
11.0
12
15
13
10
October
5.6
7
11
6
7
November
1.0
0
3
1
December
-3.8
-1
-2
-4
Average
6.0
0.3
7.0
8.8
7.3
8.0
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
0
0
March
0.0
0
0
0
0
April
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
December
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
5.5
6
4
6
6
February
7.4
6
8
6
8
March
8.0
8
10
7
8
April
8.3
7
8
8
May
8.1
7
9
9
7
June
7.3
7
7
7
8
July
5.9
6
6
6
6
August
6.1
6
5
7
6
September
6.1
6
6
6
6
October
5.7
5
5
7
5
November
4.8
6
5
6
December
5.4
5
7
5
Average
6.6
6.6
6.5
6.5
6.9
6.1
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
157°
328°
237°
289°
February
192°
217°
330°
338°
March
310°
214°
322°
332°
April
315°
308°
333°
May
318°
320°
329°
311°
June
313°
302°
316°
317°
July
316°
328°
316°
323°
August
319°
322°
322°
324°
September
309°
315°
323°
325°
October
321°
317°
331°
324°
November
332°
313°
281°
December
336°
148°
325°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.