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
88.3
77
94
89
90
90
February
89.1
98
94
88
80
87
March
87.2
77
91
82
87
85
April
91.0
87
89
94
93
May
86.4
94
77
97
91
June
93.9
89
96
97
96
July
96.6
96
97
99
95
August
95.9
94
95
98
98
September
91.8
91
91
99
94
October
88.2
95
76
93
83
November
93.8
94
93
99
93
December
86.4
77
78
94
95
Average
90.2
83.0
91.5
87.7
94.6
91.7
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
7.1
7
11
5
6
9
February
9.7
10
11
10
5
10
March
12.5
14
13
14
14
15
April
18.3
20
17
18
16
May
22.5
22
23
23
20
June
27.5
26
28
28
28
July
30.3
30
30
30
31
August
29.1
28
30
29
29
September
25.7
25
26
26
24
October
20.7
21
18
22
20
November
13.8
14
15
13
17
December
9.4
11
9
12
9
Average
17.9
10.4
19.3
19.1
19.1
19.0
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
-1.2
0
3
-4
-1
1
February
0.6
1
2
-1
-1
1
March
3.0
5
3
3
4
5
April
8.2
10
7
8
7
May
12.7
11
14
11
12
June
17.7
16
18
19
18
July
21.6
22
21
21
23
August
20.6
20
21
21
21
September
17.1
17
16
17
17
October
11.7
11
9
13
12
November
4.4
4
6
3
7
December
1.3
4
1
3
1
Average
8.9
2.3
10.1
9.5
10.0
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.7
20
15
17
10
6
February
12.6
12
10
14
24
13
March
11.5
21
12
13
8
10
April
7.1
12
10
5
8
May
8.7
7
13
7
4
June
4.3
7
4
5
4
July
5.1
7
8
1
6
August
5.2
4
1
7
9
September
8.7
14
14
4
6
October
9.0
5
19
5
14
November
8.0
11
15
2
9
December
10.6
11
23
2
8
Average
9.3
18.2
9.3
11.7
6.1
7.7
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
9.4
9
9
10
9
10
February
9.3
9
9
10
9
9
March
10.6
10
10
12
10
9
April
10.3
9
11
10
11
May
8.4
7
8
8
9
June
8.1
9
8
8
8
July
6.7
6
7
6
7
August
7.0
8
7
6
7
September
7.9
8
8
8
7
October
8.5
7
9
9
8
November
9.0
8
9
10
9
December
8.3
7
9
8
10
Average
8.7
9.2
8.2
8.9
8.2
8.6
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
285°
280°
291°
301°
279°
February
287°
272°
266°
316°
266°
March
309°
287°
253°
268°
218°
April
191°
285°
279°
282°
May
043°
059°
301°
322°
June
193°
229°
194°
205°
July
185°
200°
218°
214°
August
231°
199°
139°
160°
September
013°
325°
252°
040°
October
277°
335°
299°
304°
November
291°
242°
284°
242°
December
283°
294°
254°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.