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
92.3
94
87
96
91
95
February
91.8
95
91
99
93
99
March
92.0
94
81
99
97
92
April
96.5
94
100
97
99
96
May
96.9
97
99
100
99
June
90.0
99
100
100
97
July
98.3
100
100
100
100
August
98.0
100
100
97
93
September
99.6
100
99
100
100
October
98.6
100
99
94
100
November
96.4
99
94
94
98
December
91.0
98
86
76
95
Average
95.0
94.0
96.2
97.9
95.5
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
13.8
13
12
16
14
14
February
14.6
14
12
17
15
18
March
16.0
16
12
20
16
16
April
20.7
20
20
21
23
21
May
25.3
24
26
28
27
June
31.5
28
32
34
32
July
35.8
36
35
37
35
August
35.1
34
36
35
36
September
31.1
28
33
32
37
October
25.3
25
27
23
27
November
17.8
19
15
19
18
December
13.7
16
11
11
15
Average
22.1
15.4
22.3
24.4
23.9
23.7
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
2.6
4
2
1
3
3
February
2.3
4
0
2
3
2
March
3.8
4
3
5
3
4
April
6.4
6
6
6
6
7
May
9.1
10
8
9
10
June
13.3
12
14
14
13
July
16.5
17
17
19
16
August
16.9
17
18
17
18
September
14.0
13
16
14
19
October
8.7
9
10
8
10
November
4.6
5
2
6
3
December
2.7
4
1
2
2
Average
7.7
4.5
8.1
8.5
8.6
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
2.5
2
3
2
2
2
February
3.3
3
3
3
3
3
March
3.5
4
4
4
3
3
April
3.6
3
4
4
3
4
May
3.3
3
4
3
3
June
3.1
3
4
3
3
July
3.3
3
4
4
3
August
3.3
3
4
3
3
September
2.8
3
3
3
2
October
2.3
3
3
3
3
November
1.8
2
2
2
2
December
2.1
2
3
2
2
Average
3.0
2.9
3.0
3.3
3.0
2.7
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
193°
176°
217°
184°
236°
February
171°
199°
222°
233°
220°
March
201°
183°
221°
209°
191°
April
229°
228°
232°
219°
225°
May
210°
240°
223°
218°
June
219°
238°
205°
210°
July
208°
214°
209°
202°
August
208°
210°
201°
209°
September
212°
208°
213°
193°
October
214°
217°
200°
216°
November
198°
208°
214°
206°
December
205°
171°
173°
216°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.