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
70.7
94
0
95
95
95
February
73.2
87
0
94
97
89
March
82.6
93
0
85
98
98
April
79.2
0
92
99
95
May
72.8
0
80
90
86
June
68.1
0
78
76
89
July
63.8
0
71
75
83
August
63.7
0
68
73
81
September
65.5
0
83
62
65
October
79.3
14
74
97
90
November
92.8
95
93
90
95
December
95.1
97
91
90
97
Average
76.3
91.3
16.4
82.7
85.9
88.0
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
12.9
18
0
19
18
12
February
13.8
17
0
20
18
20
March
15.6
18
0
19
17
17
April
16.2
0
19
17
19
May
16.0
0
19
17
22
June
17.4
0
22
18
22
July
18.1
0
21
21
21
August
19.0
0
22
22
24
September
18.8
0
17
22
22
October
19.9
4
17
22
25
November
20.9
22
19
23
20
December
16.9
20
14
16
19
Average
17.1
17.4
3.8
18.9
19.2
20.0
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
3.8
6
0
5
5
1
February
3.7
7
0
3
6
5
March
5.6
7
0
5
5
7
April
6.9
0
5
8
9
May
7.9
0
8
8
11
June
9.1
0
10
8
12
July
10.9
0
13
14
13
August
11.2
0
13
14
14
September
10.2
0
9
13
12
October
7.7
1
8
9
11
November
6.3
6
3
8
5
December
4.9
7
4
5
4
Average
7.3
6.9
1.1
7.3
8.4
8.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
3
0
2
9
1
February
3.8
10
0
4
0
1
March
5.5
10
0
4
2
10
April
1.6
0
1
0
5
May
0.7
0
0
0
1
June
0.2
0
0
1
0
July
0.1
0
0
0
0
August
0.3
0
0
0
0
September
0.6
0
1
1
1
October
0.7
0
0
2
0
November
3.2
2
7
2
2
December
6.5
9
4
14
4
Average
2.6
7.4
0.8
1.6
2.3
2.0
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
5.0
7
0
6
7
7
February
5.8
6
0
8
9
7
March
7.0
8
0
9
9
7
April
7.8
0
10
9
8
May
7.8
0
10
9
10
June
7.3
0
9
8
9
July
7.2
0
9
8
9
August
6.9
0
8
8
8
September
6.6
0
8
7
7
October
6.7
1
6
8
7
November
6.7
7
7
6
7
December
6.4
6
6
6
7
Average
6.8
6.9
1.1
8.0
7.8
7.8
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
301°
360°
282°
282°
302°
February
233°
360°
294°
294°
292°
March
286°
360°
281°
294°
269°
April
360°
286°
281°
278°
May
360°
285°
284°
276°
June
360°
273°
275°
280°
July
360°
271°
269°
271°
August
360°
269°
271°
273°
September
360°
268°
270°
268°
October
287°
275°
282°
270°
November
258°
281°
272°
283°
December
282°
261°
277°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.