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
90.7
93
86
93
91
87
February
87.8
97
93
93
84
88
March
93.5
92
96
91
94
87
April
94.0
93
92
96
95
May
94.4
95
94
97
94
June
93.4
94
98
93
96
July
91.5
93
91
87
89
August
91.4
97
88
95
93
September
95.0
96
93
91
95
October
93.1
97
95
95
89
November
85.0
89
88
98
56
December
85.8
94
76
87
90
Average
91.8
93.7
93.7
91.6
92.3
88.9
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
14.7
14
17
14
14
15
February
19.0
19
21
18
16
16
March
21.4
21
22
22
22
24
April
24.3
25
24
23
24
May
28.3
27
29
27
28
June
31.0
31
33
30
30
July
32.3
33
33
31
33
August
31.9
35
29
32
33
September
30.0
31
30
29
29
October
25.3
25
25
25
25
November
16.7
12
20
19
13
December
15.2
9
18
20
15
Average
23.5
17.9
23.9
24.6
24.1
23.7
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
2.6
1
1
1
4
6
February
5.8
5
1
4
4
5
March
8.2
9
3
7
10
12
April
9.8
6
10
10
10
May
14.9
10
17
15
14
June
19.7
17
21
19
20
July
21.8
22
22
21
22
August
21.2
22
19
22
22
September
18.2
17
18
17
20
October
13.4
12
9
14
15
November
5.2
3
8
5
4
December
4.9
2
9
8
2
Average
11.3
4.8
9.6
12.3
12.4
12.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
8
7
9
10
14
February
9.3
7
5
10
10
19
March
6.7
9
7
5
11
10
April
4.9
5
9
4
6
May
4.7
4
5
2
6
June
7.0
4
2
9
7
July
4.0
4
2
6
3
August
6.4
2
10
6
5
September
4.5
2
2
10
6
October
5.0
3
3
5
6
November
6.4
10
4
2
4
December
8.8
6
3
7
6
Average
6.5
8.1
4.8
5.3
6.8
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
3
4
4
4
4
February
4.6
5
5
5
5
5
March
4.8
5
5
5
5
4
April
4.5
5
5
4
5
May
3.6
4
4
4
4
June
3.1
4
3
3
3
July
2.6
3
3
2
3
August
2.8
3
2
3
3
September
3.2
3
3
3
4
October
3.7
4
3
3
3
November
3.4
4
4
3
3
December
3.5
1
4
3
4
Average
3.7
4.3
3.7
3.6
3.5
3.7
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
299°
273°
295°
278°
034°
February
277°
234°
274°
312°
272°
March
354°
236°
238°
126°
222°
April
040°
219°
270°
299°
May
044°
198°
129°
354°
June
262°
354°
142°
159°
July
272°
219°
252°
227°
August
316°
209°
095°
239°
September
070°
036°
028°
063°
October
001°
001°
257°
065°
November
033°
025°
358°
011°
December
289°
264°
223°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.