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
89.2
92
82
93
89
79
February
88.3
92
87
84
88
88
March
94.3
93
92
89
96
98
April
97.4
98
98
98
98
May
97.4
96
98
98
99
June
93.3
98
99
94
98
July
96.1
98
98
91
99
August
81.5
98
98
40
99
September
93.0
99
93
94
94
October
94.5
97
93
98
91
November
87.4
91
84
86
88
December
86.8
91
100
71
91
Average
91.9
92.1
94.3
93.9
87.4
93.9
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
20.4
20
22
19
20
22
February
23.9
22
25
23
23
23
March
24.2
25
20
26
25
27
April
26.4
22
27
26
27
May
29.9
29
30
30
30
June
29.8
31
32
32
32
July
30.9
32
32
31
32
August
32.1
33
32
31
32
September
29.9
31
30
31
31
October
28.8
28
28
29
30
November
24.3
24
25
23
26
December
21.9
21
25
24
20
Average
26.4
22.2
26.6
27.6
27.0
27.7
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
6.4
9
3
7
4
7
February
10.4
7
9
9
9
10
March
10.8
14
7
12
12
14
April
13.9
12
16
14
16
May
16.9
16
18
17
17
June
19.4
21
22
21
21
July
21.8
23
22
23
23
August
23.1
24
23
24
23
September
20.8
21
21
22
23
October
17.9
17
14
18
19
November
12.6
13
16
7
16
December
9.2
12
11
5
5
Average
14.7
9.9
14.6
16.3
14.5
16.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.0
4
1
3
2
3
February
4.4
9
1
5
5
4
March
2.1
3
1
4
2
0
April
2.4
1
2
2
6
May
2.6
1
1
1
1
June
4.2
3
2
5
5
July
4.0
3
3
4
4
August
3.7
2
2
1
6
September
5.5
2
11
8
8
October
2.1
1
0
2
3
November
4.8
7
8
5
6
December
4.8
8
0
2
3
Average
3.7
4.9
2.5
3.5
3.0
3.9
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
5
5
5
3
February
5.5
5
6
5
6
6
March
5.9
6
6
6
6
6
April
6.1
7
7
5
6
May
5.4
5
5
7
6
June
4.4
6
5
5
4
July
3.5
4
3
4
5
August
3.7
4
4
4
4
September
4.5
4
4
4
5
October
5.3
6
4
5
5
November
5.0
5
6
5
7
December
4.5
6
7
4
4
Average
4.9
5.4
5.3
4.8
4.9
5.0
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
324°
260°
318°
257°
050°
February
276°
259°
060°
256°
267°
March
264°
258°
246°
267°
254°
April
275°
053°
277°
251°
May
300°
279°
044°
300°
June
265°
278°
224°
287°
July
269°
253°
247°
261°
August
280°
243°
180°
246°
September
037°
029°
328°
067°
October
042°
026°
019°
073°
November
035°
040°
027°
055°
December
007°
083°
254°
339°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.