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
91.2
85
82
96
97
94
February
92.5
85
94
98
95
96
March
85.9
89
80
91
98
52
April
91.5
91
86
98
96
81
May
93.8
89
94
98
90
June
88.6
94
86
85
93
July
90.2
82
91
91
90
August
90.8
84
96
89
90
September
89.1
93
94
72
85
October
95.6
92
93
96
97
November
92.9
95
96
86
93
December
94.7
95
92
90
100
Average
91.0
87.2
88.5
93.5
90.8
88.2
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
18.7
19
17
20
19
19
February
18.2
18
17
21
18
20
March
18.5
19
17
20
18
19
April
20.5
20
18
22
21
20
May
20.8
20
21
21
23
June
22.6
22
23
22
24
July
25.2
25
24
25
25
August
26.2
26
27
26
27
September
25.8
25
27
25
27
October
24.8
24
24
23
26
November
22.1
24
21
23
21
December
18.9
21
17
17
20
Average
21.5
18.7
21.1
22.4
21.4
22.6
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
6.1
6
7
5
5
6
February
6.2
9
5
4
6
6
March
8.3
9
8
8
6
10
April
10.7
10
11
11
10
13
May
13.2
14
13
14
14
June
14.9
15
14
13
16
July
17.5
17
18
15
17
August
17.9
18
19
17
17
September
16.1
17
18
16
15
October
12.2
13
15
11
12
November
7.8
8
6
9
6
December
6.4
7
6
7
3
Average
11.1
8.4
11.5
11.6
10.6
11.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.7
13
21
1
3
0
February
6.7
19
7
1
1
2
March
6.1
9
14
3
3
9
April
2.7
1
1
4
1
11
May
2.0
1
1
1
0
June
0.5
2
0
1
0
July
0.1
0
0
0
0
August
0.8
3
0
2
0
September
1.1
4
2
0
0
October
0.5
0
0
2
0
November
2.7
4
5
0
1
December
4.1
2
9
7
1
Average
3.5
10.4
4.8
1.7
1.7
2.1
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
5.1
5
6
4
5
5
February
6.0
5
6
7
6
6
March
6.3
7
6
7
7
6
April
6.5
6
6
7
6
6
May
6.4
6
7
7
6
June
6.0
6
6
6
6
July
6.2
6
6
6
6
August
6.4
6
7
6
7
September
6.1
6
6
6
6
October
5.9
6
5
6
5
November
5.5
5
6
5
6
December
4.7
4
5
5
5
Average
6.0
5.8
5.9
6.2
6.0
5.8
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
258°
239°
263°
254°
257°
February
246°
254°
265°
268°
251°
March
249°
248°
245°
255°
254°
April
252°
252°
253°
248°
239°
May
251°
241°
240°
251°
June
256°
244°
246°
248°
July
247°
249°
250°
249°
August
250°
252°
251°
246°
September
254°
250°
254°
250°
October
252°
250°
252°
251°
November
260°
248°
260°
256°
December
253°
255°
253°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.