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
83.1
79
74
92
86
79
February
80.4
97
81
84
76
82
March
87.7
85
86
90
88
82
April
90.8
90
92
88
87
May
94.7
89
98
92
98
June
94.0
93
96
92
96
July
96.6
97
98
93
97
August
96.3
99
90
99
98
September
92.6
98
98
95
85
October
89.7
91
95
92
87
November
84.7
79
81
90
89
December
84.9
86
77
87
85
Average
89.6
86.5
88.7
91.5
90.1
89.2
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
18.1
16
20
18
18
19
February
20.4
23
22
18
16
19
March
24.3
25
25
24
24
26
April
26.3
26
28
26
27
May
30.2
30
32
29
30
June
33.2
35
36
33
32
July
34.6
37
38
33
34
August
35.1
40
35
34
35
September
32.5
37
33
32
31
October
27.9
28
29
29
28
November
22.2
21
22
23
25
December
19.9
20
22
24
19
Average
26.4
21.0
28.3
27.9
26.6
27.0
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
7.2
5
10
6
7
9
February
9.8
11
10
5
6
9
March
13.5
15
15
10
12
17
April
15.5
16
18
15
16
May
20.3
20
22
20
20
June
23.6
24
25
24
23
July
24.5
25
25
23
25
August
24.3
26
24
25
24
September
21.8
23
20
21
22
October
16.3
17
14
18
16
November
11.3
12
12
10
13
December
9.2
8
13
15
7
Average
15.7
10.4
17.2
16.1
16.3
16.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.9
13
12
7
5
9
February
6.0
3
5
8
7
6
March
5.4
6
6
9
5
7
April
4.5
6
5
5
6
May
4.0
6
2
9
3
June
3.6
1
0
7
5
July
2.7
2
1
7
4
August
3.8
0
6
2
1
September
4.7
2
2
6
7
October
4.9
11
4
3
3
November
7.4
12
15
3
5
December
6.6
5
9
2
8
Average
5.2
7.1
5.5
5.3
5.1
4.9
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
6.9
7
7
7
7
7
February
7.3
8
7
7
8
7
March
7.1
6
7
8
8
7
April
7.3
7
8
7
7
May
6.3
5
7
7
7
June
5.4
5
5
5
6
July
4.8
4
5
4
6
August
4.9
6
6
4
5
September
5.0
5
4
4
6
October
5.7
6
5
5
5
November
5.7
5
6
5
6
December
6.3
6
6
7
6
Average
6.2
6.9
5.7
6.1
5.8
6.2
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°
331°
347°
301°
094°
February
226°
213°
346°
026°
334°
March
124°
138°
185°
101°
145°
April
097°
143°
108°
097°
May
118°
161°
126°
150°
June
197°
177°
146°
145°
July
205°
189°
172°
177°
August
188°
155°
171°
183°
September
129°
031°
067°
018°
October
083°
113°
286°
047°
November
047°
067°
054°
076°
December
059°
155°
186°
142°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.