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
72.1
64
73
70
75
82
February
80.0
81
79
77
62
78
March
85.0
85
83
86
95
82
April
92.0
95
87
96
91
May
89.2
87
88
91
93
June
94.2
90
95
96
91
July
92.8
94
85
95
95
August
92.8
88
89
95
93
September
90.5
86
92
96
90
October
88.2
90
83
88
88
November
89.1
87
87
96
92
December
83.2
77
70
92
82
Average
86.8
76.6
86.0
85.0
90.5
88.7
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
5.1
4
9
3
3
7
February
9.8
11
12
9
5
8
March
12.4
15
12
15
14
15
April
17.7
19
18
17
15
May
21.7
20
23
21
20
June
24.8
23
26
26
24
July
27.2
27
27
27
29
August
26.1
25
26
27
26
September
23.5
23
22
23
22
October
18.3
18
16
19
19
November
11.6
12
13
11
15
December
8.0
9
7
12
6
Average
16.3
9.9
17.4
17.1
17.1
17.0
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
-3.2
-3
0
-6
-3
-1
February
0.1
1
2
-2
-3
-1
March
1.9
4
1
3
3
5
April
6.4
7
6
6
5
May
11.8
10
13
10
10
June
15.1
13
15
16
15
July
17.7
17
18
17
19
August
17.0
17
17
18
18
September
13.9
13
13
14
14
October
8.6
8
6
11
9
November
1.8
2
3
0
5
December
0.0
1
1
3
-2
Average
6.8
0.2
7.7
7.4
7.5
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
24.9
39
26
24
22
20
February
20.0
23
21
19
19
28
March
17.7
24
21
17
10
16
April
12.2
10
18
7
14
May
11.5
12
15
10
10
June
8.9
9
6
7
13
July
6.8
5
14
5
4
August
7.7
10
8
9
8
September
6.9
5
11
5
9
October
10.8
11
15
12
9
November
9.6
11
13
4
5
December
16.8
24
21
9
16
Average
14.0
28.4
13.0
14.4
9.5
12.2
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
8.3
9
8
8
7
8
February
8.2
8
9
9
8
8
March
8.9
9
9
10
8
9
April
8.3
7
9
8
9
May
7.5
7
7
7
9
June
6.5
7
6
6
6
July
5.5
6
6
6
5
August
5.4
6
5
5
6
September
6.0
5
6
7
6
October
6.7
6
7
7
6
November
7.4
7
8
7
8
December
7.2
7
7
7
8
Average
7.3
8.4
7.0
7.2
6.8
7.2
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
261°
246°
276°
270°
248°
February
269°
256°
257°
241°
250°
March
262°
278°
257°
243°
237°
April
259°
262°
282°
279°
May
285°
221°
283°
218°
June
285°
285°
238°
259°
July
270°
247°
289°
270°
August
276°
263°
252°
253°
September
339°
307°
312°
150°
October
282°
276°
218°
226°
November
262°
213°
264°
241°
December
244°
203°
221°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.