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
86.9
81
88
94
89
77
February
82.5
91
83
84
79
89
March
90.7
94
85
96
98
74
April
92.6
95
97
93
87
May
93.9
95
93
84
94
June
96.1
93
100
95
98
July
98.4
99
100
96
97
August
97.3
100
94
98
99
September
95.2
98
100
99
90
October
89.4
88
94
95
85
November
88.9
87
80
93
90
December
86.0
91
73
85
86
Average
91.5
88.9
92.1
93.0
92.3
89.1
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
13.8
11
16
15
13
15
February
15.8
20
17
15
10
15
March
20.8
21
21
21
21
22
April
23.4
23
25
22
23
May
28.1
28
29
25
28
June
32.4
33
34
32
33
July
34.9
35
38
33
34
August
34.6
38
35
34
35
September
31.6
34
32
32
29
October
25.5
26
26
28
24
November
19.2
19
17
20
22
December
16.0
16
16
22
15
Average
23.8
17.1
25.4
25.6
24.4
24.6
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
2.2
0
4
-1
3
5
February
4.2
8
5
0
0
4
March
9.4
11
9
6
9
12
April
11.9
12
14
12
12
May
17.8
18
19
17
17
June
21.9
21
23
21
22
July
23.6
23
26
22
25
August
23.2
26
24
22
22
September
20.2
22
19
19
19
October
13.1
14
12
15
12
November
7.2
8
7
7
9
December
5.0
5
8
10
3
Average
12.5
6.1
13.9
13.3
13.1
13.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.6
6
7
2
4
8
February
7.7
5
14
7
6
9
March
4.0
6
3
3
2
10
April
3.8
4
1
4
5
May
3.6
4
2
9
5
June
2.5
2
1
4
1
July
1.0
1
0
3
2
August
3.1
0
7
2
1
September
2.7
2
1
0
4
October
7.2
8
8
2
6
November
4.8
7
10
5
1
December
6.6
7
2
2
13
Average
4.3
5.4
4.5
3.5
3.5
5.0
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
9.5
9
10
9
9
9
February
10.0
10
9
10
10
11
March
10.5
10
11
11
11
10
April
10.8
10
13
10
9
May
9.4
7
12
8
10
June
8.6
8
8
8
9
July
7.8
8
8
7
8
August
7.6
8
7
8
7
September
7.3
7
7
7
8
October
8.8
9
8
9
9
November
8.9
8
8
9
9
December
8.7
8
8
10
9
Average
9.1
9.8
8.6
9.3
8.6
8.9
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
318°
255°
309°
314°
181°
February
204°
239°
310°
355°
287°
March
163°
181°
200°
172°
167°
April
125°
167°
142°
157°
May
143°
166°
136°
143°
June
132°
150°
163°
173°
July
165°
166°
157°
161°
August
134°
148°
159°
152°
September
147°
148°
140°
066°
October
153°
196°
198°
116°
November
169°
147°
171°
160°
December
220°
240°
186°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.