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
84.8
77
78
82
93
93
February
82.7
89
88
65
82
86
March
85.9
81
90
77
89
86
April
85.7
78
92
94
87
May
88.2
95
86
91
90
June
88.9
87
91
92
91
July
90.3
80
96
82
95
August
91.7
87
95
90
96
September
87.6
79
88
93
89
October
85.9
87
80
87
83
November
92.2
93
92
99
93
December
83.2
73
84
83
86
Average
87.0
82.3
84.7
86.3
89.5
89.6
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
4.4
4
7
3
4
7
February
6.3
6
7
7
4
7
March
9.1
10
9
11
11
11
April
14.4
16
15
15
12
May
20.3
20
21
21
20
June
25.0
22
25
27
26
July
28.6
28
30
27
30
August
27.9
26
30
28
29
September
23.7
23
23
24
24
October
18.5
19
18
20
18
November
11.6
11
14
12
15
December
6.7
8
7
9
7
Average
15.2
6.6
16.3
17.3
16.9
16.9
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
-4.8
-3
0
-6
-3
-1
February
-3.6
-2
-3
-4
-3
-1
March
0.3
2
1
1
0
2
April
5.3
6
6
6
4
May
10.2
9
12
11
9
June
15.5
13
15
17
16
July
19.6
20
20
19
21
August
19.0
18
20
20
20
September
15.2
15
14
17
14
October
9.8
10
9
12
9
November
2.3
1
5
2
4
December
-1.0
1
0
1
-1
Average
6.5
-1.1
7.6
8.0
8.2
7.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.4
22
24
21
10
5
February
15.5
9
15
25
22
15
March
14.7
21
19
14
6
14
April
14.9
10
7
10
23
May
9.9
6
6
11
5
June
7.4
10
7
6
4
July
5.2
6
2
11
3
August
5.8
9
4
8
5
September
10.4
21
12
9
5
October
13.9
12
15
14
17
November
10.0
6
10
6
11
December
15.6
14
23
13
14
Average
11.8
17.3
12.2
10.9
10.1
9.5
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
9.1
8
8
10
9
9
February
8.9
9
9
9
9
8
March
10.4
10
10
9
10
10
April
10.0
9
11
10
12
May
9.0
9
10
9
10
June
8.0
8
8
8
8
July
7.7
7
9
7
8
August
7.9
8
8
7
9
September
8.1
8
7
8
8
October
8.3
7
8
8
8
November
8.4
8
9
8
8
December
8.4
7
12
8
9
Average
8.8
9.3
8.1
8.9
8.4
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
312°
308°
301°
316°
291°
February
293°
293°
277°
324°
273°
March
324°
333°
263°
268°
339°
April
185°
269°
312°
321°
May
258°
103°
286°
258°
June
156°
217°
209°
175°
July
194°
222°
260°
196°
August
217°
206°
187°
196°
September
031°
294°
260°
169°
October
281°
016°
350°
270°
November
289°
259°
279°
250°
December
297°
322°
287°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.