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
83.8
85
90
80
90
79
February
96.6
96
96
100
98
96
March
96.9
98
95
99
98
97
April
99.0
98
100
98
100
May
98.9
99
100
99
100
June
99.5
99
100
100
100
July
99.4
100
100
99
100
August
98.4
100
99
99
93
September
98.8
98
100
100
93
October
96.8
97
98
99
95
November
85.9
92
97
71
97
December
77.2
85
73
72
81
Average
93.6
93.9
96.0
96.3
94.3
93.2
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
14.2
16
12
15
16
14
February
16.7
17
14
19
18
19
March
18.5
19
16
22
19
18
April
24.0
23
23
24
26
May
26.8
25
29
29
31
June
31.2
29
33
33
31
July
34.7
35
34
36
35
August
34.5
35
36
34
35
September
31.4
29
33
33
33
October
26.6
28
28
24
29
November
18.9
20
17
18
19
December
13.9
16
12
12
15
Average
23.4
18.4
23.4
25.5
24.8
24.5
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
5.1
7
5
4
5
5
February
5.1
7
3
4
7
5
March
7.1
9
6
8
7
7
April
9.9
9
9
10
11
May
12.6
12
14
13
20
June
15.9
14
17
15
16
July
16.4
17
16
16
16
August
17.2
19
17
17
18
September
15.6
15
17
16
17
October
12.0
13
12
12
13
November
6.6
8
4
8
7
December
5.3
6
4
5
4
Average
10.3
7.8
10.5
10.8
10.9
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.5
2
6
0
3
1
February
2.2
3
4
0
0
0
March
2.9
2
8
1
1
3
April
0.9
3
0
1
0
May
0.9
1
0
0
2
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.3
0
1
0
0
October
0.1
0
0
0
0
November
0.7
0
1
0
0
December
3.1
3
11
2
1
Average
1.2
2.3
1.6
0.9
0.5
0.6
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
5.4
5
9
3
6
5
February
6.9
7
7
8
8
9
March
7.9
8
8
8
9
8
April
9.5
8
9
10
11
May
11.8
11
13
14
10
June
11.6
11
10
13
13
July
9.9
10
11
11
9
August
8.2
8
8
8
8
September
8.0
7
8
8
8
October
6.6
6
6
8
6
November
5.1
6
6
4
6
December
4.8
4
5
5
5
Average
7.6
6.9
8.0
8.3
9.0
7.5
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
209°
309°
339°
332°
272°
February
138°
266°
312°
309°
315°
March
256°
239°
287°
302°
278°
April
256°
252°
265°
253°
May
238°
277°
257°
229°
June
244°
259°
242°
256°
July
246°
238°
243°
244°
August
274°
250°
262°
264°
September
258°
270°
282°
290°
October
296°
303°
287°
330°
November
327°
294°
340°
306°
December
343°
276°
145°
328°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.