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
93.6
95
92
95
87
February
92.6
98
91
95
81
0
March
91.1
97
96
93
74
April
87.1
96
98
92
64
May
94.1
98
97
85
98
June
96.1
100
99
95
92
July
97.4
99
97
96
95
August
95.6
98
94
95
50
September
97.0
99
98
94
0
October
97.8
98
96
98
November
96.5
98
96
95
0
December
97.8
98
99
98
Average
93.4
96.4
97.3
95.6
88.3
92.0
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
15.4
21
21
0
21
February
17.6
21
22
0
21
12
March
20.3
23
23
11
23
April
23.8
24
24
24
24
May
27.0
27
28
26
29
June
29.5
31
31
28
29
July
30.8
32
31
30
32
August
30.7
33
31
30
17
September
29.6
31
29
30
0
October
26.9
27
25
28
November
23.6
24
24
24
23
December
19.2
22
23
14
Average
25.0
22.1
26.3
21.4
25.0
27.7
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
12.2
15
18
0
15
February
14.7
17
19
0
16
12
March
17.1
20
19
8
20
April
21.1
22
21
21
21
May
24.4
24
25
24
25
June
26.3
27
26
26
26
July
26.8
27
26
27
28
August
26.6
29
26
27
15
September
26.3
27
26
26
0
October
24.2
23
23
25
November
20.5
20
21
21
23
December
16.3
18
21
12
Average
22.2
18.3
22.6
18.4
21.8
24.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
Average
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
12.7
13
12
13
12
February
12.3
11
12
13
12
0
March
12.0
13
12
11
13
April
12.7
13
12
12
14
May
8.7
7
8
12
1
June
7.0
7
6
9
3
July
5.5
5
5
7
4
August
6.5
6
7
7
3
September
7.4
7
9
9
0
October
9.6
11
10
10
November
13.4
13
15
12
0
December
11.8
12
12
11
Average
9.6
12.6
9.8
9.8
10.4
2.7
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
100°
133°
040°
173°
February
171°
153°
082°
059°
360°
March
119°
133°
105°
138°
April
158°
086°
119°
109°
May
106°
163°
120°
286°
June
208°
075°
169°
225°
July
194°
176°
173°
233°
August
081°
166°
144°
360°
September
076°
049°
145°
360°
October
083°
072°
095°
November
061°
071°
057°
360°
December
071°
108°
180°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.