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
91.0
79
93
94
89
91
February
89.6
97
94
89
74
90
March
95.1
91
95
99
98
91
April
95.0
92
94
97
93
89
May
94.9
91
98
88
99
June
98.4
97
100
98
99
July
98.7
99
97
98
100
August
97.4
99
97
97
100
September
96.5
98
98
100
94
October
95.5
96
100
94
96
November
91.1
88
84
97
94
December
90.2
89
85
95
97
Average
94.2
89.8
94.6
95.2
93.7
95.0
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
17.4
15
20
18
17
19
February
19.6
23
21
17
15
18
March
24.3
26
25
25
23
24
April
28.1
31
28
31
26
27
May
30.9
31
35
29
32
June
34.4
37
37
33
34
July
36.5
38
38
34
37
August
36.0
39
35
34
37
September
32.4
35
33
34
30
October
27.2
27
28
29
29
November
21.4
20
20
23
24
December
19.2
19
19
25
19
Average
26.9
23.7
28.3
28.3
26.8
27.4
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
2.1
1
3
0
2
5
February
4.4
7
4
0
1
3
March
10.2
12
12
6
8
14
April
13.4
16
13
15
13
13
May
17.5
18
21
13
18
June
21.3
22
23
22
21
July
22.3
24
20
22
24
August
23.0
24
23
22
23
September
19.6
22
19
18
17
October
12.8
15
12
15
11
November
7.2
8
7
8
8
December
4.1
4
10
8
1
Average
12.6
8.8
14.0
13.2
12.6
13.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.6
1
1
1
3
3
February
1.9
1
0
1
7
3
March
0.8
1
0
0
0
3
April
1.3
2
1
2
2
1
May
3.0
6
2
4
1
June
1.8
0
0
1
1
July
1.5
0
2
2
0
August
2.8
1
5
2
0
September
3.7
2
1
1
4
October
3.5
3
1
1
2
November
3.5
6
7
1
2
December
2.9
5
1
0
1
Average
2.2
0.8
2.0
1.9
1.9
1.6
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
6.8
6
7
7
7
7
February
7.7
8
8
8
8
8
March
8.3
7
9
9
9
7
April
8.8
9
8
10
9
8
May
8.0
6
9
7
8
June
7.7
7
8
7
8
July
6.5
6
7
6
7
August
6.5
7
6
7
7
September
6.0
6
5
5
6
October
6.9
7
6
7
7
November
6.6
6
6
7
7
December
6.5
6
6
7
7
Average
7.3
7.4
6.9
7.3
7.1
7.1
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
245°
258°
320°
317°
231°
February
262°
239°
357°
016°
300°
March
194°
177°
232°
179°
159°
April
177°
167°
168°
117°
153°
May
141°
175°
130°
154°
June
172°
162°
150°
152°
July
160°
163°
144°
149°
August
148°
132°
170°
156°
September
163°
142°
142°
059°
October
134°
169°
181°
178°
November
226°
191°
182°
174°
December
213°
179°
223°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.