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
83.7
80
75
89
82
85
February
82.8
96
92
83
71
79
March
89.0
86
91
86
87
84
April
90.7
88
94
95
94
May
91.1
91
95
95
90
June
80.9
87
97
91
91
July
94.1
95
92
95
95
August
91.4
94
91
75
88
September
92.6
96
90
84
October
90.8
97
92
85
November
87.6
95
85
100
89
December
81.3
82
57
0
90
Average
88.0
87.7
90.4
89.1
88.5
88.2
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
12.5
11
14
11
12
13
February
16.8
16
19
16
14
13
March
19.5
20
20
20
19
20
April
23.3
22
22
23
23
May
27.1
24
28
26
25
June
30.1
28
32
29
29
July
31.8
32
32
30
33
August
30.5
31
31
24
31
September
29.0
29
28
26
October
23.6
24
22
24
November
17.7
18
18
13
20
December
13.4
14
12
16
13
Average
22.2
15.7
22.8
22.9
21.3
22.6
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
2.5
1
4
1
2
4
February
5.5
4
7
4
3
4
March
7.2
8
7
8
8
10
April
9.8
10
9
9
9
May
14.4
15
16
14
13
June
18.7
17
20
19
19
July
21.0
21
22
21
21
August
20.6
21
21
24
21
September
17.6
17
16
18
October
10.6
11
9
13
November
6.8
6
8
13
8
December
3.7
4
5
16
1
Average
10.8
4.6
11.6
11.6
10.9
11.9
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
14
7
9
9
14
February
10.0
5
8
8
14
18
March
7.6
9
7
5
9
15
April
6.0
10
2
4
6
May
4.8
2
2
3
9
June
3.5
4
1
4
3
July
2.1
2
1
3
4
August
5.1
5
4
25
6
September
3.4
0
2
8
October
4.5
1
3
3
November
7.0
5
7
0
2
December
10.1
10
16
0
5
Average
6.3
8.9
5.1
4.5
6.3
7.2
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
4.3
4
5
5
4
4
February
4.8
6
6
5
4
5
March
5.1
6
5
6
5
4
April
4.9
6
5
5
4
May
4.0
5
5
5
4
June
3.5
5
4
4
4
July
3.0
4
4
3
2
August
2.8
4
4
4
2
September
3.4
4
5
3
October
3.6
5
5
2
November
3.5
5
5
3
3
December
4.1
5
4
8
3
Average
4.0
5.2
4.7
4.9
4.5
3.4
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
262°
254°
251°
261°
289°
February
225°
242°
235°
283°
263°
March
265°
235°
249°
159°
242°
April
229°
234°
253°
254°
May
094°
225°
210°
245°
June
257°
052°
188°
243°
July
264°
240°
236°
225°
August
249°
191°
080°
205°
September
047°
051°
067°
October
274°
358°
069°
November
061°
066°
306°
068°
December
261°
168°
188°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.