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
92.1
91
87
96
95
93
February
92.8
87
93
97
98
95
March
91.4
93
79
94
99
94
April
95.0
88
98
98
93
May
96.3
91
98
98
94
June
94.3
96
92
94
98
July
94.1
88
96
94
92
August
94.6
89
95
97
94
September
94.8
96
97
95
88
October
94.6
91
96
97
92
November
93.0
97
97
83
92
December
93.4
94
96
83
97
Average
93.6
90.1
90.6
95.7
94.4
93.5
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
19.5
19
18
21
20
20
February
18.9
18
19
22
19
21
March
19.4
19
18
22
19
18
April
21.1
20
23
20
21
May
20.8
21
22
20
23
June
22.9
22
24
23
24
July
25.5
27
25
25
24
August
26.4
28
27
25
27
September
26.2
25
30
24
27
October
25.2
25
24
24
26
November
22.5
24
21
23
21
December
19.6
21
18
17
21
Average
21.9
18.4
22.3
23.2
21.5
22.5
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
10.3
11
10
11
9
10
February
10.3
11
10
10
10
11
March
11.7
12
12
12
10
12
April
13.7
14
14
13
14
May
15.1
16
15
15
16
June
17.0
18
18
16
17
July
18.9
20
19
19
17
August
19.9
21
20
19
19
September
19.2
20
22
18
19
October
16.6
16
18
15
17
November
12.8
13
11
14
11
December
10.4
12
10
10
9
Average
14.3
11.2
15.1
15.2
13.9
14.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
6
11
0
5
0
February
7.7
18
9
0
1
0
March
6.9
7
15
4
3
6
April
0.9
0
0
1
6
May
1.0
1
0
0
1
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.6
3
0
1
0
September
0.2
1
1
0
0
October
0.6
0
1
2
0
November
2.4
1
2
1
4
December
5.2
6
3
16
2
Average
3.3
10.1
3.7
0.7
2.3
1.5
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
4.2
4
6
3
4
4
February
5.2
5
6
5
5
5
March
6.1
6
6
6
6
6
April
6.3
6
7
6
6
May
6.3
6
6
6
6
June
5.8
6
6
6
6
July
6.0
6
6
6
6
August
6.0
6
6
6
6
September
5.5
5
6
6
5
October
5.0
5
5
5
5
November
4.2
4
5
4
4
December
3.7
4
4
4
3
Average
5.4
5.0
5.4
5.5
5.5
5.3
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
246°
221°
243°
238°
255°
February
212°
227°
254°
258°
249°
March
235°
239°
251°
253°
245°
April
253°
258°
250°
247°
May
246°
249°
246°
253°
June
249°
255°
248°
249°
July
252°
257°
256°
255°
August
254°
259°
255°
256°
September
239°
253°
259°
255°
October
252°
258°
256°
252°
November
241°
243°
260°
258°
December
228°
241°
244°
259°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.