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
84.1
86
82
94
87
87
February
83.1
91
82
98
87
73
March
87.5
88
81
97
94
83
April
92.7
96
89
99
93
May
96.0
93
98
100
94
June
96.4
98
98
100
100
July
98.3
100
100
100
83
August
93.3
100
100
74
92
September
87.1
98
95
91
84
October
96.2
96
97
91
99
November
90.9
97
87
95
84
December
86.5
92
78
75
91
Average
90.7
88.1
93.0
94.9
91.5
89.6
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
11.5
12
10
14
12
11
February
11.9
12
10
16
13
14
March
13.4
13
10
17
14
12
April
17.8
19
18
20
18
May
22.7
21
22
25
23
June
27.9
25
28
30
28
July
32.1
33
32
34
30
August
31.6
31
33
32
33
September
28.3
26
30
29
30
October
22.7
22
24
19
26
November
15.7
16
13
17
16
December
11.7
13
9
10
13
Average
19.3
12.0
19.7
21.6
21.2
21.0
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
5.0
5
4
7
5
5
February
4.4
5
3
7
5
5
March
5.2
5
3
8
5
3
April
8.3
8
8
9
9
May
11.8
12
11
13
11
June
16.3
14
17
18
16
July
19.7
21
21
23
9
August
20.8
21
22
21
22
September
17.8
16
19
19
20
October
14.0
13
15
11
17
November
8.7
9
6
10
8
December
5.4
7
3
4
6
Average
10.5
5.1
10.8
12.2
11.9
10.9
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
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
5.1
5
7
4
5
4
February
5.7
6
6
5
5
5
March
5.7
6
7
5
6
5
April
5.3
5
6
5
5
May
4.9
5
5
5
5
June
4.8
4
5
5
5
July
4.7
5
4
5
4
August
4.6
5
4
5
5
September
4.7
5
5
5
5
October
4.4
4
4
5
4
November
3.9
4
4
3
4
December
4.2
4
5
5
4
Average
4.9
5.5
4.9
4.8
4.8
4.6
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
173°
174°
202°
172°
186°
February
179°
194°
297°
238°
346°
March
202°
190°
230°
205°
205°
April
238°
219°
229°
259°
May
221°
245°
243°
227°
June
240°
214°
221°
220°
July
205°
216°
231°
232°
August
221°
227°
225°
233°
September
214°
214°
230°
233°
October
230°
256°
210°
249°
November
191°
177°
212°
210°
December
163°
175°
178°
177°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.