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
81.5
58
80
92
83
96
February
73.3
94
78
70
72
0
March
78.3
88
35
67
93
100
April
89.1
86
91
87
98
May
85.6
59
96
82
95
June
94.6
98
100
91
96
July
94.8
99
97
91
95
August
96.6
98
96
93
98
September
92.7
95
98
97
87
October
88.8
92
97
91
84
November
85.4
82
87
86
83
December
83.7
92
77
88
83
Average
87.1
82.1
83.4
89.6
87.9
90.9
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
16.2
15
18
17
17
18
February
17.2
20
20
16
14
5
March
20.6
23
10
23
23
27
April
25.2
24
28
24
29
May
29.6
29
33
27
29
June
33.3
34
36
32
32
July
35.1
37
38
32
36
August
36.1
39
36
34
36
September
32.3
35
33
33
29
October
27.3
28
28
29
27
November
21.0
20
20
22
24
December
16.5
20
19
10
18
Average
25.1
19.4
26.2
27.3
24.6
28.2
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
4.9
3
8
4
6
8
February
6.7
10
8
3
3
5
March
10.2
13
5
8
11
27
April
14.1
14
16
14
16
May
19.4
19
21
19
19
June
22.7
23
24
23
22
July
23.8
24
25
23
25
August
24.0
25
24
24
24
September
20.3
18
20
20
20
October
15.1
15
14
17
14
November
9.8
10
10
9
12
December
6.5
7
12
6
5
Average
14.0
8.5
14.7
15.1
14.5
16.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
3
5
4
4
7
February
5.9
1
6
3
6
0
March
1.9
2
0
2
4
0
April
2.1
4
1
3
0
May
2.6
3
0
7
2
June
1.7
1
1
3
1
July
1.2
1
0
4
0
August
1.1
0
3
2
1
September
2.7
1
1
0
6
October
3.3
4
2
3
2
November
4.3
4
9
4
3
December
4.7
3
4
1
8
Average
2.7
1.7
2.4
2.1
3.3
2.7
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
8
8
8
8
February
8.0
9
9
8
6
0
March
8.0
8
3
10
9
9
April
9.0
8
11
8
9
May
7.9
6
10
8
8
June
7.3
7
8
6
7
July
6.8
7
8
6
8
August
6.8
8
7
6
7
September
6.0
6
4
6
7
October
7.2
8
7
7
7
November
7.1
7
7
7
7
December
7.6
7
7
9
8
Average
7.5
8.3
7.0
7.7
7.1
7.4
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
311°
267°
316°
307°
193°
February
239°
221°
319°
184°
360°
March
151°
151°
193°
143°
158°
April
116°
161°
128°
188°
May
137°
166°
134°
157°
June
177°
162°
153°
156°
July
183°
177°
168°
172°
August
176°
161°
164°
168°
September
148°
106°
108°
014°
October
113°
168°
180°
072°
November
063°
085°
172°
112°
December
218°
167°
190°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.