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
90.3
93
85
96
87
85
February
86.5
94
95
92
70
85
March
91.5
86
90
91
93
81
April
93.3
89
95
95
93
May
93.2
90
92
97
92
June
92.8
92
97
89
96
July
93.1
93
95
93
93
August
91.7
100
93
89
92
September
93.7
96
94
93
90
October
92.2
92
95
92
93
November
88.8
91
87
99
89
December
81.7
90
72
75
87
Average
91.0
90.5
91.2
92.4
89.6
90.1
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
15.7
15
19
15
15
16
February
19.0
18
21
19
16
16
March
21.5
21
21
22
22
23
April
24.7
25
24
24
24
May
28.8
27
29
28
28
June
31.5
30
34
31
31
July
32.3
33
32
31
33
August
31.5
30
31
32
32
September
29.4
29
25
29
28
October
25.5
25
24
25
26
November
19.5
20
20
19
22
December
16.4
17
17
20
15
Average
23.8
17.8
24.0
24.5
24.3
24.6
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
4.3
3
5
3
5
6
February
7.4
5
9
5
5
6
March
9.1
9
9
8
10
13
April
11.7
12
10
11
12
May
16.5
16
17
14
15
June
19.5
11
21
20
20
July
22.3
23
23
22
23
August
21.8
25
22
22
22
September
17.2
18
7
18
19
October
12.7
11
3
14
15
November
7.2
7
9
5
10
December
5.9
5
8
9
3
Average
12.0
5.6
11.2
11.4
12.9
13.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.8
5
2
6
11
10
February
7.3
8
5
6
15
11
March
5.2
11
4
4
5
10
April
3.0
5
2
3
4
May
3.5
4
3
2
1
June
3.9
2
1
6
4
July
1.6
0
2
3
2
August
3.3
0
4
5
3
September
2.6
3
2
5
6
October
3.9
6
1
4
2
November
5.2
6
6
1
5
December
8.2
7
3
6
7
Average
4.7
7.9
3.9
3.2
5.2
4.8
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
7.2
8
7
7
7
7
February
7.3
8
8
7
8
8
March
7.5
7
7
8
7
7
April
6.8
7
7
7
8
May
6.1
7
6
7
7
June
5.6
6
6
5
6
July
4.9
5
5
4
5
August
4.7
4
4
5
5
September
5.5
5
6
5
7
October
6.0
6
6
5
6
November
6.2
6
7
6
7
December
6.6
7
6
7
6
Average
6.3
7.4
6.3
6.2
6.0
6.4
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
294°
251°
297°
271°
324°
February
244°
244°
247°
325°
265°
March
299°
240°
242°
098°
225°
April
204°
229°
259°
293°
May
025°
238°
195°
294°
June
271°
354°
205°
267°
July
267°
236°
248°
227°
August
048°
239°
152°
217°
September
044°
034°
040°
055°
October
354°
356°
316°
050°
November
021°
029°
354°
033°
December
300°
270°
235°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.