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
88.7
92
83
92
83
89
February
80.9
89
86
88
65
84
March
87.5
81
88
89
87
84
April
92.4
89
95
92
97
May
94.0
92
91
97
94
June
93.9
97
98
89
95
July
95.0
96
96
94
93
August
94.2
100
95
93
92
September
93.6
95
96
90
88
October
89.9
94
91
95
85
November
88.9
86
84
95
87
December
80.4
88
81
66
87
Average
90.0
87.1
91.7
92.0
87.4
90.1
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
16.6
16
19
15
16
18
February
20.3
19
22
20
17
19
March
22.6
22
22
23
23
25
April
24.7
25
25
22
26
May
28.8
28
29
28
29
June
30.9
31
33
31
31
July
31.5
33
31
31
32
August
31.5
35
31
32
31
September
30.0
31
30
29
28
October
25.6
26
16
27
27
November
20.8
20
21
20
24
December
17.8
17
20
21
17
Average
24.4
19.0
25.6
24.9
24.7
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
6.4
6
9
4
7
8
February
9.9
8
11
8
7
9
March
12.0
12
11
11
12
15
April
13.9
15
14
14
14
May
17.9
18
19
17
17
June
21.7
20
23
22
22
July
22.6
23
23
22
23
August
23.0
24
22
23
23
September
21.1
21
20
20
21
October
16.0
15
7
18
17
November
10.4
11
12
8
13
December
8.5
8
11
12
5
Average
14.6
8.8
15.3
14.6
15.1
15.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.7
5
8
7
10
8
February
4.6
4
5
5
4
9
March
4.3
8
4
5
6
5
April
3.1
4
3
5
2
May
2.7
2
3
3
3
June
4.8
3
1
6
5
July
4.9
3
9
7
7
August
7.0
3
10
7
6
September
5.4
3
2
7
13
October
5.5
3
3
5
3
November
3.9
8
2
2
6
December
6.7
8
2
5
5
Average
4.9
5.3
3.8
4.4
5.5
5.7
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
7
4
4
2
7
February
5.8
7
5
5
4
6
March
6.2
7
7
5
4
6
April
5.9
6
4
4
6
May
4.6
5
2
4
6
June
3.8
5
1
2
5
July
2.9
4
1
1
4
August
2.9
4
1
2
3
September
4.0
4
3
1
5
October
5.3
6
3
2
6
November
4.7
6
4
2
4
December
4.7
6
2
2
3
Average
4.9
6.7
5.1
2.8
2.3
5.1
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
351°
262°
340°
320°
071°
February
180°
205°
108°
352°
248°
March
031°
194°
183°
165°
191°
April
091°
191°
315°
328°
May
061°
197°
126°
143°
June
212°
348°
175°
135°
July
272°
212°
270°
262°
August
360°
184°
128°
171°
September
071°
027°
010°
074°
October
029°
069°
025°
057°
November
019°
021°
356°
046°
December
041°
045°
250°
329°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.