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
87.3
92
82
95
79
93
February
87.8
97
88
92
69
92
March
89.1
87
92
92
90
92
April
94.3
91
97
99
97
May
90.5
91
95
99
87
June
93.4
95
98
91
92
July
88.5
94
93
91
96
August
91.6
94
96
92
88
September
91.5
94
94
97
84
October
88.4
94
93
95
84
November
89.7
97
95
99
87
December
88.0
92
91
88
84
Average
89.4
91.8
92.6
94.2
91.2
89.7
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
12.6
14
15
11
11
15
February
16.0
16
18
16
12
16
March
18.3
20
19
19
20
20
April
23.3
24
23
24
23
May
26.9
25
28
27
25
June
29.9
29
31
30
30
July
32.4
32
32
31
34
August
31.4
32
31
32
31
September
28.3
28
28
29
27
October
23.5
24
22
25
25
November
17.6
18
19
17
20
December
14.3
16
12
18
13
Average
22.4
16.5
23.3
23.1
23.1
23.1
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
2.2
2
4
-1
2
5
February
5.0
3
7
4
3
6
March
6.5
7
7
5
8
10
April
10.7
11
10
10
10
May
15.9
14
17
14
14
June
19.7
17
20
20
20
July
22.2
22
23
21
23
August
21.8
21
21
22
23
September
18.5
17
17
18
18
October
12.6
11
10
14
14
November
5.8
4
8
4
9
December
3.7
3
4
6
2
Average
11.5
4.1
11.5
11.7
11.8
12.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.7
7
7
9
14
7
February
9.3
5
10
8
19
10
March
7.8
9
8
6
7
8
April
6.8
10
4
2
7
May
5.6
6
3
5
11
June
5.2
5
1
8
8
July
3.8
3
3
7
4
August
4.7
4
6
5
5
September
5.8
5
6
4
9
October
4.0
4
2
2
6
November
5.8
6
5
5
7
December
7.4
5
4
8
10
Average
6.2
7.2
5.8
4.5
6.8
7.5
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
5.2
7
5
5
3
5
February
5.9
7
7
5
5
5
March
6.1
7
7
5
5
6
April
5.6
6
7
5
6
May
5.5
7
7
4
5
June
4.6
5
5
4
4
July
4.0
4
6
3
3
August
3.7
5
4
3
3
September
4.2
5
5
4
4
October
4.2
5
5
4
3
November
4.2
5
6
4
4
December
4.3
5
4
4
3
Average
4.8
6.9
5.5
5.4
4.0
4.2
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
263°
259°
264°
307°
279°
February
290°
241°
180°
340°
229°
March
338°
281°
244°
295°
208°
April
213°
247°
244°
240°
May
009°
298°
227°
063°
June
271°
337°
182°
180°
July
227°
212°
186°
187°
August
249°
196°
170°
183°
September
004°
025°
158°
035°
October
315°
351°
226°
070°
November
008°
021°
327°
167°
December
266°
021°
213°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.