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
91.0
95
82
94
0
100
February
90.4
98
91
92
100
March
92.0
87
94
89
93
April
93.0
88
93
97
94
May
94.0
91
95
97
91
June
93.1
94
96
89
97
July
92.7
92
93
79
95
August
91.9
95
88
95
92
September
94.7
96
96
98
88
October
92.8
93
93
94
92
November
92.7
93
90
99
91
December
82.6
89
77
80
100
Average
92.5
93.1
91.6
91.5
93.0
92.5
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
15.3
16
17
15
3
10
February
19.5
18
22
19
15
March
21.7
22
22
23
22
April
24.8
25
25
24
24
May
28.4
26
30
28
27
June
31.3
30
33
31
31
July
33.0
33
33
30
34
August
32.3
33
32
32
32
September
29.8
29
29
29
29
October
25.4
25
25
26
27
November
19.4
20
21
19
17
December
17.8
17
17
20
12
Average
25.1
18.4
24.8
25.2
25.9
28.2
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
3.5
3
5
2
3
10
February
7.1
5
9
6
15
March
9.2
10
9
9
12
April
11.4
12
10
10
12
May
16.2
16
17
14
15
June
20.2
19
21
21
20
July
22.1
23
23
23
21
August
22.3
22
22
23
22
September
18.7
18
18
18
20
October
13.4
12
11
14
16
November
7.3
7
11
4
9
December
7.0
6
8
8
12
Average
13.3
5.9
13.2
13.3
14.1
17.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.4
5
10
4
0
0
February
4.2
7
5
5
0
March
5.1
6
4
7
11
April
3.6
6
3
3
6
May
3.0
6
3
2
3
June
2.4
3
1
6
1
July
3.0
5
3
5
2
August
3.6
5
5
2
4
September
3.1
4
1
5
6
October
2.9
3
1
6
2
November
7.1
9
9
3
2
December
7.2
10
6
6
0
Average
3.9
5.7
5.7
4.1
4.4
2.9
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
5.7
6
5
6
0
8
February
4.6
6
1
6
2
March
6.2
6
6
7
7
April
6.0
6
6
6
7
May
5.4
6
6
6
5
June
5.0
5
5
5
5
July
4.2
4
4
4
4
August
3.3
4
3
0
4
September
4.2
5
5
0
6
October
3.7
5
5
0
5
November
4.3
5
6
0
4
December
4.1
5
4
3
4
Average
4.9
6.0
4.7
5.2
3.0
5.0
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
221°
235°
301°
360°
311°
February
204°
341°
202°
270°
March
241°
196°
218°
121°
April
150°
201°
252°
280°
May
333°
193°
205°
341°
June
236°
059°
175°
290°
July
210°
214°
230°
234°
August
158°
179°
360°
231°
September
354°
019°
360°
083°
October
332°
010°
360°
101°
November
337°
015°
360°
010°
December
286°
042°
231°
251°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.