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
79.5
74
62
83
88
89
February
79.2
85
80
70
75
78
March
81.6
70
86
65
88
84
April
81.2
86
77
89
86
84
May
77.6
93
63
81
84
June
76.9
74
82
75
81
July
74.2
66
74
73
72
August
81.0
77
81
82
84
September
79.7
70
87
93
79
October
80.4
79
68
84
85
November
90.0
93
87
98
88
December
82.1
72
87
83
80
Average
79.9
78.7
76.9
77.1
83.2
81.9
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
5.3
5
8
4
5
6
February
6.0
5
7
6
4
6
March
8.2
10
9
10
9
10
April
12.9
13
15
14
13
11
May
17.8
19
18
18
17
June
22.5
22
23
24
23
July
26.3
27
28
25
27
August
26.3
25
28
27
27
September
22.9
23
23
24
23
October
18.1
19
18
19
18
November
12.3
11
14
12
15
December
7.6
9
9
9
8
Average
14.7
8.2
16.2
16.5
15.8
15.9
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
-3.5
-2
1
-6
-3
-2
February
-3.8
-2
-2
-3
-3
-1
March
-1.8
3
1
1
-1
1
April
4.1
4
6
5
4
3
May
9.0
8
10
9
8
June
13.6
13
13
15
14
July
17.9
19
18
18
19
August
17.7
17
19
18
18
September
14.1
15
14
16
14
October
9.4
10
9
12
9
November
2.9
2
5
2
5
December
-2.9
2
2
1
0
Average
6.2
0.7
7.6
7.3
7.2
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.2
24
22
18
5
3
February
13.9
14
9
21
20
13
March
11.8
14
15
16
5
9
April
11.0
9
6
7
9
18
May
9.2
4
11
9
6
June
6.0
8
7
3
3
July
3.3
3
2
7
2
August
6.0
8
5
6
6
September
8.4
15
7
8
4
October
13.5
12
20
10
14
November
10.4
8
14
10
10
December
14.7
14
19
14
17
Average
10.1
14.5
9.5
11.2
8.4
8.2
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
10.3
10
9
12
10
10
February
10.3
10
11
11
10
10
March
11.3
11
10
10
11
12
April
10.9
10
10
11
11
13
May
10.0
10
11
9
11
June
8.0
8
8
6
8
July
7.9
8
8
8
8
August
8.1
8
9
8
9
September
9.1
9
9
9
9
October
9.6
8
9
10
10
November
9.9
9
10
9
10
December
9.9
9
13
9
10
Average
9.6
10.4
8.9
9.8
9.0
9.8
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
322°
296°
309°
317°
290°
February
296°
291°
258°
331°
262°
March
304°
307°
246°
254°
060°
April
163°
175°
248°
300°
337°
May
216°
106°
264°
234°
June
193°
204°
223°
199°
July
199°
216°
222°
207°
August
191°
211°
198°
213°
September
068°
302°
239°
132°
October
257°
052°
009°
106°
November
275°
244°
288°
242°
December
282°
343°
276°
281°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.