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
85.6
74
82
85
92
90
February
83.9
96
87
78
74
85
March
85.6
81
89
81
87
83
April
89.6
82
91
94
91
May
86.3
95
81
94
92
June
91.3
86
89
97
95
July
93.7
92
98
94
92
August
94.2
94
96
96
92
September
90.5
85
94
95
94
October
85.8
92
82
90
78
November
93.9
98
88
99
91
December
84.0
76
72
87
92
Average
88.3
83.1
88.4
87.2
91.8
89.8
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
5.2
5
9
3
5
8
February
8.1
9
10
8
4
9
March
11.0
13
11
13
13
14
April
17.3
20
16
18
15
May
22.6
23
24
23
21
June
27.4
26
27
29
29
July
30.4
30
31
30
32
August
28.9
28
31
29
29
September
25.2
25
25
26
25
October
19.4
20
18
21
18
November
12.3
12
15
12
16
December
7.4
10
7
10
7
Average
16.8
9.0
18.6
18.5
18.1
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
2
-6
-2
0
February
-2.8
-1
0
-3
-3
0
March
1.2
4
1
2
2
4
April
6.7
9
6
7
6
May
11.6
10
13
11
11
June
16.6
15
16
18
17
July
19.9
20
21
20
21
August
19.3
19
20
20
20
September
15.4
16
15
16
15
October
9.8
10
8
12
10
November
2.3
1
4
2
5
December
-1.8
2
1
2
-1
Average
7.3
0.7
8.7
8.3
8.6
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.8
22
12
15
6
5
February
11.7
9
7
15
21
14
March
12.7
17
12
14
10
11
April
8.8
9
10
6
14
May
8.9
2
13
9
7
June
4.6
6
4
3
4
July
4.0
4
3
3
5
August
4.8
5
1
5
6
September
6.7
14
8
4
2
October
8.7
5
16
3
13
November
6.8
4
13
4
8
December
11.1
15
20
1
10
Average
9.0
16.3
7.5
9.9
6.1
7.9
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
6.3
5
6
6
7
6
February
6.1
6
7
6
6
6
March
6.9
7
7
7
7
6
April
6.4
6
7
7
7
May
4.6
4
4
5
5
June
4.4
4
4
4
5
July
3.8
4
4
4
4
August
4.0
4
5
3
4
September
4.3
5
5
5
4
October
4.8
5
5
5
4
November
6.0
5
6
6
6
December
5.5
4
6
5
7
Average
5.3
5.8
4.9
5.4
5.2
5.2
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
297°
289°
298°
307°
295°
February
301°
284°
282°
319°
274°
March
303°
299°
283°
290°
293°
April
267°
290°
294°
302°
May
293°
319°
302°
287°
June
297°
279°
239°
271°
July
254°
244°
276°
269°
August
301°
248°
270°
261°
September
005°
291°
273°
331°
October
293°
330°
283°
285°
November
291°
278°
287°
270°
December
286°
306°
272°
278°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.