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
89.3
71
92
94
95
86
February
86.5
91
94
85
81
94
March
89.8
91
86
95
96
79
April
93.6
96
94
97
92
89
May
92.8
92
88
87
96
June
97.1
96
99
95
98
July
97.9
97
99
96
98
August
97.8
98
96
98
100
September
94.2
95
99
99
91
October
88.3
86
98
95
87
November
90.0
86
78
95
90
December
86.7
85
70
97
90
Average
91.8
87.7
91.8
92.3
93.9
91.1
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
15
13
12
14
February
14.1
19
16
14
6
14
March
20.3
21
18
21
21
21
April
23.6
25
23
26
22
22
May
27.6
27
29
25
28
June
32.4
32
34
32
33
July
34.9
35
38
33
34
August
34.8
38
35
34
34
September
31.0
33
33
33
28
October
24.2
25
25
27
23
November
18.1
19
16
20
20
December
14.5
16
13
21
14
Average
23.4
19.0
24.7
25.0
23.9
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
-1.4
-1
1
-4
1
2
February
0.8
5
1
-2
-4
1
March
6.4
8
5
4
7
9
April
10.0
12
9
11
9
9
May
15.7
16
17
16
15
June
20.2
20
21
20
20
July
22.2
22
23
22
23
August
21.9
23
22
22
24
September
17.9
19
17
18
15
October
10.9
11
11
13
9
November
4.5
6
4
5
7
December
2.0
4
4
4
0
Average
10.4
6.2
11.3
10.8
11.1
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
10
14
4
1
6
February
8.0
9
12
15
9
5
March
4.8
8
7
7
3
7
April
4.6
6
4
4
4
3
May
5.3
9
12
6
3
June
2.0
2
2
3
1
July
2.5
5
1
3
3
August
2.9
0
6
2
1
September
4.3
7
1
0
4
October
7.0
11
12
1
4
November
4.2
6
11
1
3
December
4.1
3
5
3
6
Average
4.9
8.3
6.7
6.5
2.8
4.0
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
9.4
7
10
10
10
10
February
10.5
10
10
11
11
10
March
10.8
10
11
12
12
10
April
11.4
11
11
13
11
11
May
9.4
7
11
10
10
June
8.9
8
9
8
10
July
7.3
7
8
6
8
August
7.8
8
8
8
7
September
7.9
8
8
8
7
October
9.3
10
8
10
9
November
9.1
8
9
9
9
December
8.7
8
9
9
9
Average
9.3
9.7
8.8
9.7
9.0
9.1
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
071°
313°
011°
336°
035°
February
297°
252°
005°
020°
341°
March
208°
046°
338°
177°
101°
April
164°
101°
151°
112°
155°
May
135°
159°
127°
115°
June
102°
144°
163°
175°
July
167°
176°
156°
153°
August
078°
149°
164°
122°
September
146°
168°
161°
104°
October
074°
094°
154°
129°
November
170°
143°
172°
177°
December
238°
172°
208°
352°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.