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
86
91
90
95
February
84.9
95
86
79
76
86
March
93.5
92
97
93
95
87
April
96.2
94
97
100
96
May
97.0
98
98
97
96
June
96.9
95
99
97
98
July
96.0
94
97
93
97
August
95.9
95
94
96
96
September
96.0
95
97
95
98
October
94.9
95
99
95
92
November
93.3
95
90
95
95
December
86.3
89
74
85
92
Average
93.6
92.4
93.4
93.3
93.2
94.2
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
11.8
9
15
10
11
13
February
15.8
17
18
15
11
14
March
18.9
20
19
20
20
20
April
22.7
22
22
22
21
May
27.5
27
28
26
25
June
30.9
31
33
30
30
July
32.3
32
34
31
32
August
31.5
32
31
30
32
September
29.7
30
29
28
28
October
24.0
25
23
24
24
November
17.3
19
18
17
19
December
14.0
15
14
18
13
Average
22.2
15.4
23.6
23.3
22.3
22.5
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
2.3
0
5
-1
2
5
February
5.2
5
7
2
1
4
March
7.8
9
8
7
9
11
April
10.5
11
10
9
10
May
16.3
16
17
14
14
June
20.2
19
21
20
20
July
22.2
22
24
21
22
August
21.4
22
22
22
22
September
18.2
18
17
18
18
October
12.4
12
9
14
12
November
5.4
7
7
3
7
December
4.4
4
7
8
1
Average
11.3
4.7
12.4
12.0
11.7
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.2
15
9
14
8
15
February
14.4
8
11
17
17
23
March
7.8
10
8
7
7
13
April
6.2
8
5
3
4
May
4.9
5
4
4
8
June
4.2
4
1
7
4
July
3.3
2
3
8
2
August
4.1
3
5
7
5
September
5.4
4
4
7
6
October
7.0
8
1
8
8
November
5.7
5
8
4
5
December
11.9
7
27
7
7
Average
7.4
11.1
5.8
6.9
7.0
8.0
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
7.7
8
8
8
7
7
February
7.9
8
8
8
8
8
March
8.2
8
8
9
8
8
April
7.7
8
9
7
8
May
6.9
7
8
7
7
June
6.3
6
6
7
7
July
5.0
5
6
5
4
August
5.0
5
5
5
5
September
5.5
5
6
5
7
October
6.5
7
7
6
6
November
6.5
7
7
6
7
December
6.9
7
7
7
7
Average
6.8
7.8
6.5
7.0
6.3
6.6
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
183°
226°
328°
265°
165°
February
212°
221°
176°
330°
267°
March
149°
233°
200°
118°
214°
April
178°
195°
247°
303°
May
125°
190°
147°
161°
June
259°
110°
163°
189°
July
250°
227°
192°
215°
August
310°
189°
140°
223°
September
070°
068°
106°
090°
October
215°
121°
194°
109°
November
120°
072°
282°
109°
December
203°
175°
199°
232°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.