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
85.4
86
76
86
81
89
February
78.7
95
87
86
67
71
March
88.7
82
89
89
89
81
April
90.7
82
94
96
92
May
91.7
93
91
95
90
June
91.5
91
93
91
94
July
93.5
97
92
87
95
August
90.4
93
90
89
85
September
93.8
96
90
90
91
October
87.1
94
92
84
86
November
87.2
90
86
95
84
December
78.1
81
65
80
86
Average
88.1
88.1
90.0
88.7
87.4
87.5
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
11.8
10
14
11
11
13
February
15.8
16
18
15
13
14
March
18.5
18
19
19
19
20
April
22.0
21
22
22
21
May
25.7
24
26
24
24
June
28.1
28
29
27
28
July
30.2
31
30
29
30
August
29.5
31
29
29
30
September
27.1
27
26
26
26
October
22.0
22
21
22
23
November
16.6
17
17
16
19
December
13.0
13
13
17
12
Average
20.5
14.3
22.0
21.5
21.1
21.4
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
1.7
0
4
-1
2
3
February
4.9
3
7
3
2
4
March
6.7
8
6
6
7
10
April
9.0
9
9
8
8
May
13.9
14
15
12
12
June
17.9
17
18
18
18
July
20.2
20
20
20
20
August
19.9
20
20
20
20
September
16.5
16
16
16
17
October
10.9
10
7
13
13
November
5.0
5
6
3
7
December
3.7
2
6
9
0
Average
9.6
3.3
10.8
10.2
10.4
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.6
10
9
8
10
15
February
10.6
6
11
9
9
21
March
8.3
13
9
7
10
16
April
5.2
10
4
3
6
May
4.9
4
4
2
6
June
5.1
1
5
3
5
July
3.2
2
2
6
4
August
4.9
3
4
8
8
September
4.9
2
6
9
8
October
7.0
4
2
9
7
November
6.9
9
5
2
6
December
11.9
8
12
11
8
Average
7.0
9.0
5.3
5.2
6.7
8.8
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
5.0
6
4
5
5
5
February
4.9
6
4
6
6
5
March
5.4
6
4
6
5
4
April
5.1
4
5
5
6
May
3.8
4
4
5
4
June
3.2
4
3
3
3
July
2.6
3
2
3
3
August
2.7
3
3
3
2
September
3.3
3
4
3
4
October
4.0
4
5
3
4
November
4.5
5
5
5
5
December
4.4
4
3
4
5
Average
4.3
5.7
3.7
4.1
4.0
4.0
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
329°
282°
324°
308°
360°
February
305°
249°
303°
347°
286°
March
032°
312°
252°
083°
228°
April
334°
227°
304°
321°
May
058°
194°
141°
295°
June
306°
342°
148°
291°
July
316°
254°
281°
307°
August
326°
317°
057°
287°
September
067°
027°
011°
071°
October
353°
346°
328°
087°
November
047°
028°
354°
018°
December
330°
153°
237°
312°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.