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
87.9
87
87
90
85
90
February
84.7
90
92
96
74
79
March
92.7
95
95
98
92
87
April
95.3
97
98
96
96
May
94.9
95
96
95
94
June
93.2
92
96
94
94
July
92.4
90
95
91
96
August
91.8
94
94
89
91
September
93.3
93
95
91
92
October
92.1
96
99
90
85
November
91.5
95
91
95
95
December
85.6
87
68
88
89
Average
91.4
90.1
92.9
93.8
90.3
91.1
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
9.7
8
13
9
9
12
February
13.9
15
16
14
11
12
March
17.3
19
17
19
19
19
April
20.8
22
21
21
20
May
25.9
25
27
24
23
June
28.7
28
30
29
29
July
30.7
30
32
30
33
August
29.9
29
30
30
30
September
28.2
28
27
27
26
October
22.4
23
22
22
23
November
15.8
20
17
15
18
December
12.3
12
13
17
11
Average
20.4
12.8
21.5
22.0
21.0
21.4
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
0.4
-2
4
-1
1
4
February
3.6
2
5
0
1
3
March
6.3
8
6
6
7
9
April
8.3
9
9
8
8
May
14.6
14
16
12
12
June
18.0
16
19
18
18
July
20.4
22
20
20
21
August
20.1
21
20
20
21
September
16.6
16
15
15
17
October
10.5
10
7
13
12
November
3.7
5
4
2
6
December
2.8
3
4
6
0
Average
9.6
1.9
10.5
10.2
10.2
10.9
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
0
February
0.0
0
0
0
0
0
March
0.0
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
0
November
0.0
0
0
0
0
December
0.0
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
5.5
6
6
6
5
6
February
6.0
4
7
7
6
7
March
6.5
6
7
7
6
7
April
6.0
6
6
5
6
May
4.7
5
5
5
4
June
4.1
4
4
4
5
July
3.6
4
4
3
4
August
3.1
4
3
3
3
September
3.4
3
4
3
4
October
4.2
5
5
4
4
November
4.6
5
5
5
5
December
4.9
5
5
5
5
Average
4.7
5.5
4.9
5.1
4.4
4.7
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
275°
243°
266°
279°
245°
February
319°
234°
241°
292°
249°
March
253°
256°
239°
272°
245°
April
265°
247°
266°
268°
May
248°
233°
259°
242°
June
255°
245°
230°
233°
July
226°
230°
232°
258°
August
360°
238°
262°
237°
September
353°
004°
302°
325°
October
270°
266°
250°
279°
November
171°
280°
254°
260°
December
256°
238°
226°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.