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
95.0
97
86
98
99
97
February
93.9
84
91
100
98
99
March
94.3
91
87
98
98
98
April
96.2
89
99
99
97
May
93.2
83
95
96
96
June
94.5
93
96
97
93
July
96.8
95
95
97
99
August
97.8
97
99
99
97
September
97.1
95
100
98
90
October
96.1
96
92
94
97
November
96.1
99
95
91
98
December
96.0
96
96
84
100
Average
95.1
90.4
92.1
96.6
95.7
96.5
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
19.4
19
17
22
21
20
February
19.3
17
17
23
21
22
March
20.3
19
17
24
20
19
April
23.9
23
26
24
23
May
23.5
21
26
24
27
June
27.4
23
31
29
28
July
31.5
33
32
32
30
August
32.0
31
34
31
33
September
30.3
26
34
30
34
October
27.6
28
27
26
29
November
23.7
23
21
26
24
December
19.6
20
16
18
21
Average
24.1
18.2
23.2
26.5
25.0
25.6
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
8.3
8
7
10
9
8
February
8.2
9
7
9
9
9
March
9.8
9
8
12
9
10
April
12.5
11
14
12
13
May
13.8
13
16
14
15
June
16.2
14
18
17
17
July
19.0
19
19
19
17
August
19.4
19
22
19
19
September
18.3
18
22
17
18
October
14.8
15
17
13
15
November
10.2
10
9
12
9
December
7.9
9
7
8
8
Average
12.7
8.7
12.4
14.7
13.1
13.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.9
5
19
1
4
0
February
7.7
19
12
0
1
3
March
8.1
10
16
4
3
10
April
1.4
0
0
0
9
May
1.4
1
0
0
2
June
0.2
0
0
0
0
July
0.1
0
0
0
0
August
0.7
4
0
0
1
September
0.5
1
1
0
0
October
0.7
1
1
3
0
November
2.2
3
5
0
0
December
4.8
5
7
14
3
Average
3.6
11.2
4.8
1.3
2.0
2.3
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
4.6
5
7
3
5
4
February
5.5
5
6
5
6
5
March
6.0
6
7
6
6
6
April
6.0
5
6
6
6
May
5.9
6
6
6
6
June
5.5
5
6
6
6
July
5.8
5
6
6
6
August
5.6
5
6
5
6
September
5.0
5
5
5
4
October
4.7
5
5
5
4
November
4.1
4
5
4
4
December
4.1
4
4
4
4
Average
5.3
5.4
5.3
5.4
5.3
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
207°
130°
142°
138°
190°
February
151°
152°
154°
303°
136°
March
158°
159°
173°
172°
168°
April
166°
173°
160°
162°
May
167°
167°
169°
167°
June
165°
161°
164°
166°
July
158°
164°
164°
166°
August
165°
165°
167°
167°
September
170°
165°
168°
167°
October
157°
171°
170°
165°
November
172°
182°
155°
170°
December
173°
179°
157°
169°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.