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
92.3
92
95
87
95
February
90.5
94
91
88
93
March
93.8
93
92
91
91
95
April
92.2
86
94
91
94
May
93.3
95
84
96
96
June
88.7
94
34
92
93
July
95.8
97
97
92
96
August
94.2
98
96
97
60
September
91.5
97
89
70
October
91.3
92
94
80
November
83.7
87
84
71
December
87.0
95
88
85
Average
91.7
92.8
93.2
87.1
87.1
92.7
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
19.6
20
20
17
20
February
23.0
21
24
21
20
March
24.3
26
24
24
24
26
April
25.8
24
25
25
26
May
28.8
27
29
28
28
June
30.5
30
31
30
30
July
31.6
33
31
30
31
August
31.0
34
31
30
21
September
29.8
31
28
25
October
27.1
27
25
27
November
21.6
23
23
18
December
21.0
21
20
22
Average
25.8
22.3
26.4
25.2
25.8
25.5
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
6.1
6
5
4
7
February
7.5
7
9
7
7
March
8.9
12
10
11
10
11
April
10.1
10
11
10
13
May
13.1
14
15
13
14
June
18.1
17
18
17
19
July
20.8
22
20
21
20
August
19.1
23
19
22
11
September
18.1
20
18
14
October
15.2
15
11
14
November
10.2
11
12
6
December
9.4
10
9
9
Average
12.5
8.3
13.9
12.8
13.4
13.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.6
3
1
1
2
February
3.3
6
2
3
5
March
2.2
4
2
4
0
0
April
2.7
2
1
3
3
May
2.2
2
1
1
3
June
4.1
3
1
4
7
July
2.5
3
1
4
2
August
2.0
2
1
2
0
September
4.2
3
8
2
October
2.5
2
1
0
November
3.9
5
5
5
December
3.6
5
2
1
Average
3.0
4.1
2.5
2.4
2.1
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
6.6
6
6
7
6
February
6.3
6
7
6
6
March
6.9
6
7
7
7
6
April
6.9
7
7
6
7
May
6.5
6
6
7
7
June
5.4
6
6
5
5
July
4.6
4
4
5
6
August
4.7
6
4
5
3
September
5.6
6
5
3
October
6.1
6
5
5
November
5.8
6
7
5
December
5.4
6
4
5
Average
5.9
6.2
5.9
5.7
5.2
6.0
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
292°
258°
313°
006°
February
316°
248°
088°
315°
March
168°
257°
217°
083°
216°
April
093°
100°
055°
231°
May
055°
123°
083°
088°
June
253°
167°
173°
097°
July
244°
200°
154°
182°
August
144°
122°
177°
117°
September
063°
047°
084°
October
039°
038°
061°
November
027°
035°
021°
December
007°
039°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.