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
92.7
95
89
97
94
96
February
93.2
88
93
100
96
98
March
91.1
96
79
92
99
95
April
93.2
80
100
98
91
May
95.0
88
99
98
92
June
90.1
95
84
87
96
July
90.8
84
89
90
87
August
91.8
80
93
95
88
September
94.5
97
98
93
90
October
94.7
92
96
95
92
November
92.9
99
98
77
92
December
94.3
97
96
81
99
Average
92.8
92.8
89.1
94.7
92.0
92.8
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
18.6
18
17
20
19
20
February
18.1
16
17
21
19
21
March
18.4
17
16
20
18
19
April
20.1
18
21
19
21
May
19.9
19
21
19
22
June
21.6
20
23
21
23
July
23.7
23
23
23
23
August
24.6
24
25
24
25
September
24.9
23
28
23
25
October
24.2
23
23
23
25
November
21.8
23
21
22
20
December
19.0
20
17
16
20
Average
20.8
17.1
20.2
22.0
20.4
21.8
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
10.4
10
9
11
10
11
February
10.3
11
9
11
10
12
March
11.2
11
10
12
10
12
April
13.2
12
14
13
14
May
14.4
14
15
14
16
June
16.4
15
17
16
17
July
18.2
17
18
18
17
August
19.0
19
19
18
19
September
18.7
18
21
17
18
October
16.4
15
17
15
17
November
12.9
13
11
14
11
December
10.7
12
10
10
10
Average
13.9
10.6
13.6
14.7
13.7
14.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.0
5
14
1
2
0
February
6.8
17
11
1
0
1
March
6.5
6
17
2
2
8
April
0.9
1
0
0
6
May
1.5
3
0
1
2
June
0.8
2
1
0
0
July
0.1
0
0
1
0
August
0.9
4
1
1
0
September
0.4
2
1
0
0
October
0.4
0
1
2
0
November
1.7
1
3
0
1
December
4.7
5
6
14
2
Average
3.2
9.3
4.7
1.2
1.7
1.6
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
6.5
7
8
5
6
6
February
7.5
7
8
7
7
7
March
8.5
9
9
9
9
8
April
8.5
8
9
8
8
May
8.3
8
8
8
8
June
7.8
8
8
8
8
July
8.0
8
8
8
8
August
8.1
8
9
8
8
September
7.7
7
8
8
7
October
7.3
7
7
8
7
November
6.6
6
7
6
7
December
6.1
6
7
7
6
Average
7.6
7.6
7.6
7.7
7.6
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
276°
229°
257°
241°
262°
February
231°
238°
253°
264°
255°
March
244°
246°
251°
254°
246°
April
253°
256°
251°
250°
May
246°
251°
250°
251°
June
247°
248°
248°
251°
July
250°
252°
254°
254°
August
253°
257°
254°
258°
September
243°
248°
255°
256°
October
246°
251°
256°
255°
November
249°
253°
258°
260°
December
261°
255°
245°
287°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.