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
85.0
85
80
92
88
85
February
79.7
90
85
77
78
76
March
91.3
87
94
88
94
89
April
93.5
87
94
98
93
May
94.3
93
95
95
95
June
95.1
94
93
93
96
July
92.6
89
94
92
92
August
92.5
96
86
94
95
September
94.3
93
96
92
95
October
91.4
96
95
92
84
November
90.3
90
89
94
92
December
82.5
89
78
89
94
Average
89.9
87.0
90.5
90.4
91.8
90.8
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
12.5
11
16
13
12
15
February
16.3
19
19
16
12
15
March
19.7
20
21
21
21
22
April
22.5
23
24
23
23
May
27.0
28
29
26
27
June
30.3
31
33
31
31
July
32.1
33
34
32
33
August
31.2
34
32
32
32
September
30.0
31
30
29
29
October
24.9
25
24
25
25
November
18.2
19
19
18
20
December
15.4
16
17
20
14
Average
22.5
16.5
24.6
24.5
23.5
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
3.2
0
6
0
3
6
February
5.8
6
8
2
1
5
March
8.8
9
9
7
9
13
April
10.9
9
11
10
11
May
17.0
16
18
16
16
June
20.5
20
21
20
20
July
22.3
22
23
22
23
August
22.1
22
22
22
21
September
19.3
19
17
19
19
October
13.1
13
10
15
13
November
6.0
7
7
4
8
December
5.3
4
9
9
2
Average
11.9
4.9
12.9
12.5
12.6
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
10
6
7
9
10
February
9.4
7
8
7
7
15
March
7.0
10
5
6
7
10
April
4.6
6
4
1
5
May
2.9
2
1
4
3
June
3.6
2
2
7
2
July
3.5
3
2
3
3
August
3.4
1
7
3
4
September
2.9
1
2
3
4
October
6.2
4
3
1
5
November
3.8
5
5
4
3
December
5.9
5
8
2
1
Average
5.5
9.3
3.7
4.0
4.0
5.3
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
7.4
8
8
8
7
7
February
8.0
8
8
8
8
8
March
7.8
7
8
8
8
8
April
7.8
8
9
7
7
May
6.7
6
7
7
7
June
5.6
5
5
7
6
July
4.9
4
6
5
4
August
4.7
5
4
5
5
September
5.4
5
5
5
7
October
6.6
7
7
6
7
November
6.3
6
6
6
6
December
6.8
7
7
7
7
Average
6.6
7.7
6.3
6.6
6.4
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
237°
205°
310°
265°
178°
February
192°
205°
197°
333°
238°
March
147°
184°
188°
146°
199°
April
106°
172°
204°
314°
May
079°
176°
128°
158°
June
276°
022°
153°
165°
July
246°
202°
199°
190°
August
324°
154°
121°
358°
September
062°
025°
086°
051°
October
144°
154°
182°
070°
November
038°
071°
348°
073°
December
199°
179°
188°
210°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.