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
89.3
91
80
91
88
91
February
84.5
95
83
81
81
85
March
93.0
90
94
90
93
90
April
95.3
89
94
99
96
May
96.4
95
99
97
97
June
95.3
97
95
93
97
July
95.2
91
95
94
96
August
94.8
94
95
96
93
September
96.8
98
93
97
98
October
93.8
98
95
94
94
November
91.3
91
90
97
91
December
83.2
88
76
85
90
Average
92.7
91.7
91.6
91.9
93.1
93.6
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
13.4
12
16
13
13
15
February
17.6
19
19
17
14
16
March
20.9
21
21
21
22
22
April
23.9
23
24
23
23
May
27.9
27
29
27
27
June
30.8
31
33
30
30
July
32.3
33
33
31
32
August
31.7
33
31
31
32
September
30.3
30
31
28
29
October
24.8
25
24
25
25
November
18.4
19
19
18
21
December
15.3
15
16
20
14
Average
23.1
16.9
24.4
24.4
23.3
23.8
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
3.7
2
7
1
4
6
February
6.9
6
9
5
3
6
March
9.2
10
8
9
10
13
April
11.7
12
12
11
11
May
17.3
17
19
16
15
June
21.0
20
22
21
21
July
22.9
23
24
22
23
August
22.5
23
23
22
23
September
19.1
20
18
15
20
October
14.0
14
10
16
14
November
6.9
8
8
6
10
December
5.8
5
9
9
3
Average
12.6
5.8
13.7
13.4
12.9
13.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.2
11
7
9
9
9
February
10.5
7
16
10
9
16
March
6.8
8
8
6
9
11
April
4.2
7
4
2
5
May
3.3
5
3
1
4
June
4.2
2
1
8
4
July
2.0
1
1
4
4
August
4.3
4
6
6
5
September
4.0
3
3
6
4
October
5.3
3
4
6
5
November
5.6
6
6
4
5
December
8.3
2
13
5
4
Average
5.7
8.6
5.0
4.8
5.7
6.1
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
7.2
7
7
8
7
7
February
7.3
8
8
7
7
8
March
7.8
7
8
8
7
8
April
7.5
8
8
7
8
May
6.4
6
7
7
7
June
5.8
6
5
6
6
July
5.2
5
6
5
5
August
4.9
5
4
5
5
September
5.3
5
6
4
7
October
6.1
7
6
6
6
November
6.1
6
6
6
6
December
6.4
6
7
7
6
Average
6.4
7.3
6.3
6.4
6.1
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
272°
238°
305°
269°
232°
February
218°
221°
238°
323°
259°
March
340°
259°
233°
162°
221°
April
218°
206°
256°
304°
May
061°
202°
146°
216°
June
290°
011°
158°
221°
July
294°
229°
219°
267°
August
321°
228°
107°
279°
September
046°
022°
041°
063°
October
318°
335°
200°
096°
November
355°
007°
324°
022°
December
261°
215°
213°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.