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
84.4
73
83
91
83
92
February
87.1
96
94
88
77
82
March
88.8
81
92
88
87
87
April
93.1
90
96
96
95
May
90.9
97
84
95
89
June
93.4
92
96
90
94
July
91.7
93
89
90
94
August
87.4
94
87
89
81
September
88.5
85
86
91
86
October
86.8
91
91
90
84
November
90.7
94
83
96
92
December
85.0
79
69
96
93
Average
88.5
82.6
90.3
87.9
90.1
89.0
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
9.3
8
12
8
9
10
February
13.6
15
15
12
10
12
March
15.9
18
16
17
17
17
April
20.2
21
19
20
19
May
23.9
23
25
23
22
June
27.0
26
28
27
27
July
29.3
30
30
29
30
August
27.9
29
27
28
28
September
25.9
26
24
25
24
October
21.0
21
19
21
22
November
14.7
16
15
14
17
December
11.5
12
10
16
10
Average
19.3
13.6
20.5
19.7
19.8
19.9
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
-1
2
-3
0
2
February
2.4
2
4
0
0
3
March
4.5
5
3
4
5
8
April
7.8
8
7
6
8
May
13.0
12
13
11
11
June
16.6
15
16
17
17
July
18.9
19
19
18
20
August
18.4
19
18
18
19
September
15.5
15
14
15
16
October
9.6
9
6
11
9
November
3.2
3
4
1
5
December
1.4
1
3
3
-1
Average
8.4
1.9
9.2
8.8
8.8
9.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.4
18
17
12
10
16
February
12.5
6
15
13
14
19
March
9.9
18
9
14
9
8
April
10.0
18
5
9
6
May
8.6
5
12
5
10
June
5.9
11
2
7
7
July
4.3
4
6
4
5
August
7.6
7
7
8
10
September
7.7
2
14
6
12
October
7.2
2
4
14
8
November
7.9
9
18
4
3
December
12.5
20
18
5
7
Average
9.2
14.2
9.5
9.9
7.6
8.9
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
7.9
8
7
8
8
8
February
7.7
7
8
8
8
6
March
8.0
7
8
9
7
7
April
7.6
6
8
8
9
May
6.1
6
6
6
6
June
5.7
5
6
5
6
July
4.9
6
5
5
5
August
4.5
5
4
4
5
September
5.0
5
5
5
5
October
5.8
6
6
5
5
November
6.6
6
6
6
7
December
6.4
5
5
6
8
Average
6.4
7.1
6.0
6.1
6.1
6.3
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
337°
321°
334°
338°
348°
February
301°
297°
331°
338°
338°
March
342°
329°
251°
340°
225°
April
283°
272°
325°
336°
May
329°
191°
312°
330°
June
336°
333°
230°
328°
July
320°
263°
292°
315°
August
334°
230°
287°
284°
September
332°
335°
335°
335°
October
331°
334°
337°
308°
November
347°
359°
338°
350°
December
336°
158°
217°
346°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.