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
89.1
83
92
95
88
83
February
85.8
92
88
93
80
88
March
92.0
94
90
96
100
79
April
95.2
98
99
94
92
May
95.2
97
95
88
95
June
97.6
97
100
98
97
July
99.1
100
100
99
97
August
97.8
100
96
96
100
September
95.6
98
99
99
92
October
91.7
94
94
97
88
November
91.3
89
86
96
95
December
86.3
77
83
92
91
Average
93.0
89.7
93.7
95.4
94.2
91.6
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
14.0
12
17
15
13
15
February
15.7
20
18
15
10
15
March
21.4
21
21
22
22
22
April
24.3
23
27
23
24
May
28.8
29
31
26
29
June
33.1
34
36
32
33
July
35.7
38
39
33
34
August
35.4
40
35
34
36
September
32.0
34
32
32
29
October
25.9
26
27
28
25
November
19.2
19
18
21
22
December
16.1
18
17
21
16
Average
24.3
17.7
26.3
26.4
24.5
24.9
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
4.6
2
7
2
6
8
February
6.5
9
6
2
3
6
March
11.5
12
12
8
11
14
April
13.7
14
15
13
13
May
18.9
19
19
18
18
June
23.6
24
25
23
24
July
24.6
26
25
24
25
August
24.7
26
26
24
24
September
21.0
23
20
18
19
October
15.3
15
15
17
15
November
10.0
10
9
10
13
December
7.4
7
9
13
6
Average
14.3
7.6
15.7
14.8
15.1
15.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
3
2
0
11
8
February
5.4
1
5
3
8
6
March
3.0
7
2
1
1
7
April
2.7
3
0
6
2
May
3.3
2
1
6
6
June
1.1
1
0
0
2
July
0.7
1
0
1
1
August
1.6
0
1
2
0
September
1.3
1
1
0
1
October
4.9
3
5
1
3
November
3.2
3
6
1
0
December
4.2
6
4
0
6
Average
3.0
4.0
2.2
1.5
2.8
3.3
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
7.3
8
8
7
7
6
February
8.0
9
8
8
8
8
March
8.6
8
9
9
9
8
April
8.5
8
10
8
7
May
7.5
6
9
7
8
June
7.3
7
7
6
8
July
6.9
8
8
6
7
August
6.6
7
6
6
6
September
6.2
7
5
6
7
October
7.1
7
7
7
7
November
7.0
7
7
7
7
December
6.8
6
7
8
7
Average
7.4
8.1
7.2
7.6
7.0
7.2
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
287°
232°
292°
292°
178°
February
215°
239°
284°
317°
274°
March
163°
181°
198°
172°
151°
April
115°
163°
129°
161°
May
143°
167°
115°
128°
June
148°
150°
142°
159°
July
164°
169°
145°
153°
August
158°
140°
153°
134°
September
144°
128°
115°
009°
October
122°
120°
168°
113°
November
160°
122°
181°
156°
December
191°
198°
192°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.