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
82.9
82
75
89
81
87
February
83.2
91
86
82
70
87
March
87.7
81
86
90
87
90
April
90.8
86
94
97
96
May
88.6
89
85
97
79
June
91.9
85
98
93
91
July
94.7
96
93
95
96
August
92.7
91
95
95
87
September
87.6
92
88
91
83
October
88.2
96
93
93
80
November
87.3
96
84
100
83
December
84.4
83
73
94
86
Average
88.2
84.0
88.4
89.5
91.5
87.2
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
9.8
10
12
9
9
11
February
14.0
14
16
14
9
13
March
16.6
18
17
19
17
18
April
21.6
22
21
22
21
May
25.1
23
26
25
22
June
28.5
27
30
29
28
July
31.2
31
31
30
32
August
29.7
30
30
31
29
September
26.9
27
26
27
25
October
22.0
22
20
23
22
November
15.4
16
17
15
18
December
11.8
13
10
16
11
Average
20.2
13.8
21.2
21.2
21.0
20.8
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
0.6
0
3
-2
0
3
February
3.3
3
6
2
0
3
March
5.7
7
6
6
6
9
April
9.8
10
9
9
9
May
14.9
13
15
13
13
June
18.7
17
19
19
19
July
21.3
21
21
21
22
August
20.3
20
20
21
21
September
17.4
17
16
17
16
October
11.5
11
9
13
12
November
4.6
4
7
3
7
December
2.4
3
2
6
1
Average
10.0
3.4
10.8
10.7
10.6
11.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.3
15
18
11
15
16
February
13.5
8
13
15
20
14
March
9.4
15
12
7
10
5
April
7.9
12
5
3
7
May
8.3
10
7
5
17
June
5.7
12
1
4
8
July
2.4
2
4
4
1
August
4.0
6
3
4
5
September
6.9
4
11
5
10
October
8.2
5
10
5
11
November
8.2
5
10
2
5
December
11.7
13
16
5
7
Average
8.5
12.6
9.1
7.5
6.4
8.6
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
7.5
8
7
8
7
8
February
8.1
8
9
8
8
8
March
8.6
8
8
9
8
9
April
8.6
8
9
8
9
May
7.9
9
8
7
8
June
6.9
7
7
7
8
July
6.2
6
6
6
6
August
5.7
6
6
5
6
September
6.4
6
7
6
7
October
6.2
6
6
7
6
November
6.7
6
8
7
6
December
6.6
6
6
7
8
Average
7.2
8.1
6.9
7.2
6.9
7.4
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
265°
261°
303°
299°
290°
February
260°
250°
244°
333°
257°
March
321°
271°
245°
316°
240°
April
239°
254°
272°
277°
May
018°
270°
271°
306°
June
307°
285°
223°
261°
July
263°
242°
232°
238°
August
291°
244°
167°
226°
September
037°
010°
265°
042°
October
285°
340°
291°
333°
November
009°
030°
304°
256°
December
276°
312°
234°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.