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
90.2
83
92
92
93
92
February
88.7
93
95
89
81
84
March
88.7
78
87
86
90
90
April
93.2
88
94
96
94
May
90.0
98
82
98
92
June
94.5
89
96
92
96
July
96.8
95
97
99
98
August
96.8
97
98
98
95
September
93.4
94
95
98
94
October
90.4
93
87
94
84
November
94.2
97
90
100
93
December
86.7
75
76
98
95
Average
91.5
84.0
91.7
90.5
95.1
92.6
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
7.8
8
11
5
7
9
February
11.4
12
13
12
7
11
March
14.5
16
14
17
16
17
April
20.4
22
19
21
18
May
24.1
23
24
24
22
June
28.8
28
29
29
29
July
31.6
32
31
32
33
August
30.2
30
31
31
30
September
26.7
27
27
27
25
October
21.4
22
19
23
21
November
14.1
13
16
14
18
December
10.0
12
9
14
9
Average
19.2
12.2
20.6
20.2
20.5
20.3
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
-2.7
-1
1
-4
-1
1
February
0.6
1
2
-1
-1
1
March
2.8
4
2
3
4
6
April
7.8
8
7
7
7
May
12.6
10
13
11
12
June
16.6
15
16
18
17
July
20.5
20
20
20
22
August
19.5
19
19
20
21
September
16.2
16
15
16
16
October
10.3
9
8
13
10
November
2.6
1
4
1
5
December
0.3
1
0
2
0
Average
8.2
1.4
8.6
8.7
9.2
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
10.8
24
13
12
4
5
February
12.1
11
12
17
15
11
March
10.8
19
13
15
7
6
April
8.9
15
12
3
9
May
9.1
7
18
6
4
June
5.6
13
8
5
3
July
4.0
4
8
1
2
August
4.7
5
4
4
8
September
6.8
13
6
5
3
October
7.3
7
14
6
9
November
6.8
11
9
3
7
December
10.8
16
23
1
8
Average
8.8
18.0
10.4
11.7
4.8
5.8
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
5.8
6
5
6
6
5
February
5.3
5
6
6
5
5
March
6.6
5
7
7
6
5
April
6.1
5
6
7
7
May
4.1
3
3
5
5
June
4.2
4
4
4
4
July
3.7
4
3
5
4
August
3.5
4
4
3
3
September
3.4
3
4
4
3
October
4.2
4
4
4
4
November
5.1
4
5
5
5
December
4.5
3
4
4
6
Average
4.8
5.4
4.3
4.7
4.7
4.6
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
290°
288°
299°
306°
299°
February
279°
285°
280°
300°
276°
March
294°
289°
271°
290°
236°
April
230°
286°
288°
300°
May
293°
141°
286°
282°
June
255°
262°
188°
215°
July
208°
188°
227°
200°
August
251°
206°
182°
193°
September
322°
284°
247°
253°
October
283°
292°
272°
274°
November
290°
279°
295°
262°
December
285°
292°
244°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.