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
86.2
83
80
92
89
92
February
84.5
96
89
86
77
81
March
90.3
81
89
90
91
85
April
94.2
88
92
99
94
May
95.5
95
96
98
96
June
94.9
92
97
95
94
July
96.3
97
94
95
98
August
94.4
92
94
94
95
September
95.9
96
94
93
96
October
92.6
98
94
92
92
November
91.4
93
90
99
91
December
84.0
83
68
85
92
Average
91.5
86.4
91.2
91.5
92.6
92.4
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
12.7
12
15
12
12
14
February
16.6
18
19
17
14
15
March
19.6
20
20
21
21
21
April
23.2
23
23
23
22
May
27.2
26
28
26
26
June
29.9
29
32
30
29
July
31.8
33
32
31
32
August
31.1
33
30
31
31
September
29.1
28
28
28
27
October
23.8
23
23
24
24
November
17.7
18
18
17
20
December
14.1
14
14
18
13
Average
22.3
16.2
23.4
23.4
22.8
22.7
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
2.7
1
6
1
3
5
February
5.6
4
8
4
3
5
March
7.9
8
7
7
9
11
April
10.4
11
10
10
10
May
15.8
16
17
14
14
June
19.7
18
21
20
19
July
21.7
21
23
22
22
August
21.5
22
22
22
22
September
18.0
16
16
18
19
October
12.6
12
9
14
14
November
6.1
7
8
4
8
December
4.5
3
7
7
2
Average
11.3
4.5
12.1
12.1
12.1
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
8
8
9
9
13
February
10.3
7
12
10
8
20
March
8.0
13
12
4
7
14
April
5.7
12
4
3
5
May
4.6
5
4
3
4
June
5.0
5
1
7
4
July
2.3
2
3
5
2
August
4.9
1
3
7
7
September
4.1
4
3
7
9
October
6.0
4
2
12
5
November
6.3
9
6
2
5
December
11.4
9
17
11
6
Average
6.6
9.5
6.5
4.9
6.4
7.3
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
6.0
7
5
6
6
6
February
6.2
6
6
6
7
6
March
6.7
6
6
7
6
6
April
6.4
7
6
6
7
May
5.6
6
6
6
6
June
4.9
5
5
5
5
July
4.3
4
4
4
4
August
4.4
5
4
4
4
September
4.9
4
6
4
6
October
5.2
6
5
4
5
November
5.5
6
6
5
6
December
5.4
5
5
4
6
Average
5.5
6.3
5.4
5.5
5.1
5.5
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
298°
265°
291°
294°
323°
February
272°
256°
288°
327°
275°
March
344°
273°
258°
076°
244°
April
337°
246°
277°
289°
May
041°
221°
239°
285°
June
297°
336°
205°
238°
July
298°
249°
246°
273°
August
291°
238°
143°
263°
September
036°
032°
360°
064°
October
338°
322°
267°
035°
November
037°
005°
318°
001°
December
316°
297°
234°
299°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.