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
90.2
91
85
93
88
93
February
87.5
98
91
91
84
89
March
93.4
90
96
97
91
87
April
96.1
94
96
98
97
May
96.0
97
96
96
96
June
94.6
92
98
95
95
July
93.3
92
94
90
95
August
94.4
95
94
93
95
September
96.3
98
96
96
97
October
94.6
99
95
93
93
November
94.4
97
95
95
94
December
86.5
85
76
82
89
Average
93.2
92.8
93.6
94.3
92.0
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
11.1
9
14
10
11
13
February
15.3
17
17
15
12
13
March
18.1
19
19
20
19
20
April
22.0
22
22
22
21
May
26.0
25
27
25
24
June
29.1
29
31
29
29
July
30.6
31
31
30
31
August
29.4
31
24
30
30
September
22.6
29
0
27
14
October
20.4
23
9
23
20
November
16.6
18
17
16
19
December
13.1
14
13
17
12
Average
20.4
14.8
22.6
18.4
21.7
20.4
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
0.9
-1
4
-1
1
3
February
3.9
3
6
1
1
3
March
5.9
7
5
5
7
10
April
8.3
9
8
7
8
May
13.9
14
16
13
13
June
17.9
17
18
18
18
July
19.9
20
19
20
21
August
18.6
20
15
21
20
September
12.9
16
0
16
7
October
10.0
10
3
12
11
November
4.0
5
6
2
7
December
2.9
2
6
6
0
Average
9.1
2.7
10.6
8.0
10.3
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.6
11
11
10
8
13
February
11.3
5
11
6
15
21
March
7.7
12
8
4
10
12
April
5.5
7
4
4
4
May
4.6
5
3
4
8
June
4.7
4
1
8
5
July
3.4
4
1
5
3
August
4.9
4
3
7
5
September
4.4
1
5
5
6
October
6.3
3
2
8
8
November
5.4
5
7
2
7
December
11.3
8
22
7
7
Average
6.7
9.5
5.6
4.8
6.7
7.7
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
5.1
6
6
6
6
6
February
5.5
7
6
6
6
6
March
6.5
7
7
7
7
6
April
6.1
6
7
6
7
May
5.0
5
6
6
5
June
4.4
5
4
5
5
July
3.8
4
5
4
4
August
3.7
4
4
4
4
September
4.3
4
5
4
5
October
4.6
6
6
4
4
November
5.1
5
6
5
5
December
5.1
5
5
5
5
Average
5.0
6.3
5.3
5.5
5.1
5.2
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
295°
250°
301°
280°
279°
February
246°
233°
259°
310°
266°
March
263°
267°
245°
086°
238°
April
247°
237°
273°
294°
May
005°
216°
233°
246°
June
280°
350°
211°
241°
July
281°
224°
231°
250°
August
297°
207°
142°
239°
September
039°
040°
027°
079°
October
265°
326°
196°
084°
November
047°
017°
298°
034°
December
259°
223°
221°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.