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
88.4
81
89
95
88
82
February
85.6
92
84
92
83
91
March
91.5
91
89
97
98
81
April
94.4
97
98
93
91
May
95.1
97
97
82
97
June
97.7
96
99
98
99
July
99.2
100
100
98
99
August
97.0
100
91
98
100
September
95.3
98
98
99
92
October
91.7
90
94
96
88
November
90.3
90
80
94
93
December
86.9
88
79
92
89
Average
92.5
87.9
93.4
93.9
93.2
91.9
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
14.3
11
17
14
13
15
February
16.3
20
17
15
10
15
March
21.5
21
21
22
21
21
April
24.3
23
26
22
23
May
29.1
29
31
25
29
June
33.0
35
35
31
33
July
35.8
38
39
34
34
August
35.4
40
35
34
36
September
31.7
35
32
33
28
October
25.7
26
27
28
25
November
19.5
19
17
20
22
December
16.3
17
16
22
15
Average
24.3
16.9
26.4
26.1
24.5
24.8
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
3.1
0
6
0
4
6
February
4.9
8
5
1
0
4
March
10.3
11
10
8
10
12
April
12.7
13
14
12
12
May
18.5
19
19
17
18
June
22.4
24
24
22
22
July
24.8
26
27
24
24
August
24.4
27
23
24
23
September
20.8
23
21
20
19
October
14.1
15
14
16
12
November
8.2
9
8
8
10
December
5.9
6
8
10
4
Average
13.3
6.2
15.3
14.1
14.0
13.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.6
7
9
1
6
7
February
6.3
5
13
5
4
9
March
4.1
6
3
4
2
9
April
3.3
3
1
5
6
May
4.4
5
1
11
6
June
1.8
1
1
3
2
July
1.0
0
0
1
1
August
3.0
0
7
3
0
September
3.3
2
2
1
3
October
7.2
7
7
5
4
November
5.2
6
10
7
2
December
6.2
8
3
1
8
Average
4.3
5.8
4.5
3.2
4.1
4.6
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
9.6
9
10
9
9
9
February
10.1
10
10
10
10
10
March
10.7
10
11
12
12
10
April
10.9
10
13
10
10
May
9.9
7
12
8
10
June
9.0
8
9
8
9
July
7.8
8
9
7
8
August
7.7
8
8
8
8
September
7.6
8
7
7
8
October
9.0
10
8
10
9
November
8.9
8
8
9
10
December
8.8
9
8
10
9
Average
9.3
9.7
8.9
9.4
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
302°
252°
302°
308°
189°
February
220°
247°
294°
329°
289°
March
158°
181°
200°
168°
163°
April
110°
165°
132°
175°
May
138°
159°
128°
146°
June
131°
145°
160°
165°
July
167°
159°
153°
153°
August
142°
134°
153°
146°
September
147°
135°
128°
040°
October
146°
141°
190°
111°
November
159°
153°
169°
161°
December
200°
181°
182°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.