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
84.2
72
82
85
93
87
February
85.9
98
90
88
81
89
March
86.8
92
83
91
83
April
92.5
86
96
95
94
May
89.7
99
87
96
96
June
93.0
83
92
96
96
July
95.3
93
96
94
98
August
96.0
98
97
98
97
September
91.7
90
92
95
93
October
89.4
93
88
90
85
November
93.5
97
87
100
98
December
81.6
73
70
88
87
Average
89.7
84.3
89.9
89.5
93.4
92.3
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
4.8
5
8
2
5
7
February
8.0
9
11
8
4
8
March
11.3
12
13
14
14
April
17.7
20
16
19
15
May
22.9
23
24
23
21
June
27.8
27
28
29
28
July
30.7
30
31
30
33
August
29.4
29
31
30
30
September
25.4
25
25
26
25
October
19.6
20
17
21
19
November
12.0
13
14
11
16
December
7.2
9
6
10
7
Average
16.7
6.7
18.8
18.2
18.5
18.6
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
-3.8
-1
1
-6
-1
-1
February
-1.0
0
0
-3
-2
0
March
1.7
2
2
3
4
April
7.2
9
6
8
6
May
12.7
11
14
12
11
June
17.6
16
18
19
18
July
21.2
21
22
21
23
August
20.3
20
21
21
21
September
16.4
16
16
17
15
October
10.6
10
8
13
10
November
2.7
2
4
2
5
December
-1.8
2
-1
2
-1
Average
7.8
-1.4
9.1
8.8
9.6
9.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.2
18
12
16
9
7
February
11.5
5
6
13
17
11
March
12.4
12
14
9
9
April
9.9
11
13
4
13
May
10.2
4
12
10
10
June
5.9
9
6
6
3
July
4.8
4
5
4
3
August
5.0
2
3
6
6
September
8.5
12
10
10
3
October
9.4
8
14
7
10
November
8.1
6
14
4
7
December
11.3
11
15
3
10
Average
9.2
11.9
7.9
10.6
7.2
7.3
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
7
9
8
February
7.5
7
8
9
7
7
March
8.6
9
9
9
7
April
8.3
7
9
9
9
May
6.5
6
6
7
8
June
6.2
7
7
6
6
July
5.1
5
5
5
6
August
5.2
6
6
5
6
September
5.3
6
6
6
5
October
5.9
6
5
6
6
November
6.9
6
7
7
7
December
6.5
6
7
5
8
Average
6.7
7.7
6.6
6.8
6.6
6.7
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
301°
302°
306°
310°
310°
February
302°
292°
289°
307°
292°
March
307°
293°
300°
301°
April
275°
291°
296°
310°
May
283°
133°
302°
279°
June
293°
283°
242°
289°
July
261°
240°
293°
272°
August
290°
261°
227°
257°
September
334°
292°
283°
283°
October
297°
276°
306°
302°
November
294°
281°
296°
285°
December
296°
301°
291°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.