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
86.4
84
86
92
90
84
February
94.7
95
91
99
95
100
March
95.6
97
90
96
98
99
April
97.0
97
99
99
98
May
94.4
87
95
99
91
June
95.9
92
95
99
99
July
99.6
100
100
98
100
August
96.8
100
100
95
84
September
95.9
98
100
100
75
October
96.8
94
99
92
98
November
87.8
94
90
79
96
December
84.8
87
75
68
92
Average
93.8
91.8
93.0
95.4
92.8
93.0
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
13.8
14
14
15
14
13
February
16.2
17
14
19
17
19
March
18.3
18
15
22
19
19
April
23.2
23
24
26
24
May
27.9
26
28
30
29
June
33.0
31
34
34
34
July
36.2
37
36
37
36
August
35.3
35
36
35
36
September
31.7
30
33
33
33
October
26.0
26
28
23
28
November
18.1
20
16
17
18
December
13.4
16
11
11
14
Average
23.5
16.4
23.7
25.5
24.6
25.2
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
5.2
7
5
3
6
5
February
4.7
8
3
2
5
4
March
6.6
8
6
7
5
6
April
8.9
8
8
8
10
May
11.9
11
11
13
13
June
15.1
14
16
17
15
July
16.9
18
17
18
15
August
17.1
18
17
16
19
September
14.9
15
17
14
15
October
10.0
11
11
11
11
November
5.8
6
4
8
4
December
4.2
6
3
5
4
Average
9.8
7.5
10.0
9.7
10.3
10.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.5
13
27
1
2
4
February
8.6
12
21
0
2
0
March
9.6
10
23
2
3
8
April
4.3
3
5
2
4
May
3.0
8
0
0
3
June
0.8
0
3
0
0
July
0.1
1
0
0
0
August
0.9
4
0
0
1
September
1.8
6
3
1
0
October
1.6
3
0
6
0
November
5.3
6
8
2
3
December
10.5
10
26
12
4
Average
5.2
11.4
9.2
3.4
2.4
2.0
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
7.1
7
10
5
7
6
February
7.9
8
10
6
7
7
March
7.9
9
10
7
8
8
April
7.0
7
9
6
6
May
7.1
7
9
8
7
June
6.5
6
8
7
7
July
5.3
6
6
6
5
August
4.9
6
5
5
5
September
5.6
6
6
5
5
October
5.7
5
4
8
5
November
5.1
6
7
4
5
December
5.9
5
8
7
6
Average
6.5
8.1
7.0
6.6
6.3
5.9
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
152°
150°
318°
328°
185°
February
165°
159°
317°
304°
324°
March
158°
168°
200°
355°
181°
April
195°
180°
146°
176°
May
169°
267°
270°
197°
June
188°
199°
168°
226°
July
202°
191°
181°
216°
August
223°
204°
184°
231°
September
183°
217°
205°
283°
October
297°
280°
185°
306°
November
303°
177°
312°
247°
December
146°
163°
163°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.