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
81.2
81
70
94
78
80
February
81.0
95
75
72
70
86
March
85.7
72
87
84
88
85
April
90.7
82
94
96
97
May
89.8
91
91
97
81
June
92.6
85
98
93
91
July
93.6
96
83
96
96
August
91.2
89
90
95
88
September
91.4
96
89
91
87
October
89.1
98
86
92
83
November
87.7
94
81
99
85
December
82.3
84
68
86
86
Average
87.7
81.6
87.3
86.7
90.5
87.2
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
12.1
11
14
10
12
14
February
16.2
16
18
15
13
15
March
18.4
18
18
20
20
21
April
22.8
22
22
22
23
May
26.3
24
27
25
25
June
29.6
28
31
29
29
July
32.0
31
32
31
33
August
30.9
31
30
31
32
September
28.6
27
27
27
27
October
23.7
23
21
24
24
November
17.1
17
18
16
20
December
13.9
14
11
17
14
Average
21.7
14.9
22.2
22.2
22.4
23.0
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
2.1
1
4
-1
2
5
February
5.0
4
6
3
3
5
March
6.9
6
7
6
9
11
April
10.3
10
9
9
11
May
15.1
13
15
13
14
June
19.1
17
19
19
20
July
21.3
21
21
20
23
August
20.8
20
20
20
23
September
17.9
17
16
16
18
October
12.0
10
9
13
12
November
5.4
5
7
3
8
December
3.6
3
4
6
2
Average
10.7
3.6
11.0
10.9
11.0
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.3
16
11
7
11
16
February
10.4
7
10
11
11
15
March
8.9
10
13
12
8
7
April
8.3
19
5
3
6
May
5.6
7
3
3
11
June
4.3
9
2
3
3
July
2.1
1
3
5
2
August
4.0
5
3
4
4
September
5.3
2
9
6
7
October
4.7
2
3
3
6
November
7.3
7
13
3
4
December
10.8
14
10
6
7
Average
7.0
10.9
8.3
6.3
5.2
7.0
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
4.7
5
4
5
4
5
February
5.2
6
5
5
5
5
March
5.3
4
5
6
5
5
April
5.2
5
5
5
5
May
4.6
6
5
4
5
June
4.1
4
4
4
5
July
3.5
3
4
4
3
August
3.3
3
3
3
3
September
4.4
4
5
4
6
October
3.9
4
4
4
4
November
4.4
4
5
5
4
December
4.3
4
4
5
4
Average
4.4
4.9
4.3
4.5
4.3
4.4
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
271°
228°
011°
355°
003°
February
226°
217°
040°
035°
226°
March
034°
247°
223°
034°
215°
April
041°
218°
263°
252°
May
042°
080°
035°
037°
June
037°
047°
156°
183°
July
116°
207°
198°
110°
August
055°
072°
080°
163°
September
040°
032°
049°
036°
October
022°
027°
054°
032°
November
035°
042°
009°
047°
December
343°
042°
215°
303°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.