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
88.9
87
84
94
88
87
February
73.4
90
78
85
77
41
March
77.2
76
91
84
85
0
April
84.3
92
94
91
36
May
96.2
96
95
96
98
June
97.5
97
97
99
97
July
98.0
96
97
98
98
August
96.2
97
93
96
96
September
97.4
94
97
99
95
October
95.2
99
97
100
93
November
93.6
93
89
99
93
December
86.1
91
86
75
96
Average
89.7
83.5
92.7
92.3
92.3
77.9
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
17.8
17
20
17
17
19
February
19.3
19
22
19
19
11
March
19.3
22
23
23
22
0
April
22.8
25
25
24
12
May
28.3
28
29
28
28
June
30.5
31
30
30
31
July
31.6
32
31
31
32
August
31.7
34
31
31
32
September
30.4
30
30
29
30
October
26.9
26
26
27
28
November
22.4
22
23
22
25
December
19.3
18
21
22
18
Average
24.3
19.5
25.8
25.5
25.1
22.1
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
8.2
7
10
7
8
10
February
10.9
9
14
9
10
6
March
11.2
14
15
13
14
0
April
13.6
17
16
15
4
May
19.0
19
20
19
19
June
23.4
23
24
23
23
July
24.0
25
24
24
25
August
23.9
25
24
24
21
September
22.7
22
22
22
23
October
17.9
16
15
19
19
November
12.0
11
14
10
16
December
10.3
10
12
13
6
Average
15.6
10.1
17.2
16.5
16.7
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.4
6
6
8
7
5
February
4.7
7
9
4
6
1
March
3.7
8
3
9
1
0
April
2.3
4
1
7
0
May
3.3
3
4
1
1
June
6.4
2
6
7
6
July
5.4
6
8
6
5
August
6.1
2
7
8
8
September
4.3
0
5
7
10
October
3.2
2
1
5
2
November
2.8
6
6
3
1
December
5.0
13
0
3
3
Average
4.6
6.8
4.2
5.0
5.0
3.5
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
8.1
8
8
8
8
8
February
7.5
8
8
7
8
5
March
7.6
8
8
9
9
0
April
8.0
9
9
8
4
May
8.1
7
8
8
9
June
7.7
9
7
8
8
July
6.6
7
6
7
8
August
6.7
7
6
7
7
September
7.2
7
7
6
9
October
7.5
7
7
7
8
November
7.7
8
8
7
9
December
7.6
8
6
7
8
Average
7.5
7.9
7.7
7.4
7.5
6.7
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
038°
172°
020°
287°
075°
February
164°
164°
080°
079°
156°
March
122°
168°
163°
128°
360°
April
141°
144°
145°
190°
May
181°
188°
144°
156°
June
238°
229°
179°
177°
July
245°
211°
219°
235°
August
236°
161°
167°
215°
September
109°
081°
130°
108°
October
057°
083°
072°
082°
November
056°
039°
053°
060°
December
051°
090°
143°
068°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.