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
89.8
91
85
93
77
97
February
89.8
99
89
92
63
90
March
90.3
87
93
92
89
90
April
92.2
89
96
99
93
May
90.4
90
92
98
80
June
92.0
93
97
89
87
July
92.6
95
85
91
96
August
88.6
90
89
88
87
September
89.8
92
90
93
81
October
91.8
96
91
91
86
November
90.5
93
92
95
91
December
88.1
91
92
87
83
Average
90.4
91.9
91.6
91.6
90.2
88.4
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
13.6
14
16
11
12
16
February
16.8
16
19
17
13
16
March
19.1
21
19
21
20
20
April
23.4
24
24
23
23
May
26.5
25
28
27
24
June
29.5
29
31
29
28
July
31.4
32
31
31
33
August
30.7
32
30
31
30
September
28.2
28
28
29
27
October
23.8
24
22
25
25
November
18.2
18
20
17
21
December
15.0
16
14
18
13
Average
22.6
16.9
23.4
23.3
23.8
22.9
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
2.0
2
4
-1
2
5
February
4.9
3
6
3
3
6
March
6.7
8
6
7
7
10
April
9.6
9
9
9
9
May
15.5
13
17
13
14
June
18.9
17
18
20
19
July
21.7
22
23
21
22
August
21.0
21
20
22
22
September
17.6
17
17
17
19
October
11.9
10
10
13
13
November
5.2
4
7
3
9
December
3.0
2
4
5
1
Average
11.1
4.1
10.9
11.3
11.9
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.0
6
5
7
14
5
February
9.0
7
9
8
23
10
March
8.3
12
8
9
6
6
April
6.2
9
2
1
6
May
6.2
8
4
5
12
June
4.9
3
2
8
8
July
5.2
4
7
8
4
August
5.9
7
4
8
4
September
6.3
7
7
4
10
October
3.9
3
3
4
4
November
5.3
7
4
3
5
December
8.7
7
5
5
9
Average
6.4
8.4
6.5
5.0
6.3
6.8
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
5.2
7
6
0
4
7
February
5.5
7
7
0
6
6
March
5.9
7
7
0
6
6
April
5.1
6
0
6
7
May
4.7
7
0
5
5
June
3.9
6
0
4
5
July
3.3
4
0
3
4
August
3.9
5
4
3
3
September
4.2
5
5
1
4
October
4.1
5
6
0
4
November
4.4
5
6
0
4
December
4.3
5
5
0
5
Average
4.6
7.2
5.8
1.9
3.1
4.8
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
265°
265°
360°
340°
305°
February
310°
258°
360°
337°
283°
March
318°
295°
360°
338°
269°
April
243°
360°
288°
283°
May
005°
360°
300°
320°
June
259°
360°
232°
255°
July
231°
360°
227°
240°
August
257°
213°
221°
237°
September
355°
032°
268°
008°
October
325°
346°
360°
004°
November
358°
025°
360°
303°
December
279°
005°
360°
293°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.