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
87.8
90
87
93
83
90
February
85.9
95
89
90
67
87
March
91.2
86
92
90
89
94
April
93.6
94
97
96
96
May
89.5
94
85
99
86
June
92.2
90
98
94
90
July
93.7
94
94
97
96
August
91.3
93
93
93
86
September
87.9
90
94
96
85
October
89.1
94
94
95
78
November
90.8
95
92
100
88
December
86.2
89
84
91
87
Average
90.0
89.8
92.0
92.2
92.2
88.6
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
10.0
10
13
9
9
11
February
14.0
14
17
14
9
12
March
16.9
19
17
19
17
19
April
22.1
23
22
22
21
May
25.5
23
26
25
23
June
28.9
27
30
30
28
July
31.8
32
31
31
33
August
27.5
30
30
32
12
September
27.4
27
27
28
23
October
22.2
23
21
24
22
November
15.8
17
18
16
19
December
12.0
14
10
16
11
Average
20.2
14.4
21.8
21.6
21.5
19.7
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
-1.4
0
2
-3
-1
1
February
2.0
1
4
0
0
2
March
4.3
5
4
5
5
8
April
8.3
8
8
7
7
May
13.4
12
14
11
12
June
17.0
15
16
18
18
July
19.5
19
20
20
21
August
16.0
14
19
20
8
September
15.1
11
14
15
13
October
9.5
8
7
12
10
November
2.6
1
5
1
5
December
0.8
1
1
3
0
Average
8.0
2.1
8.1
9.1
9.2
8.9
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
4.4
6
4
3
3
5
February
4.8
5
6
6
2
5
March
5.7
5
6
7
4
6
April
5.5
4
6
5
6
May
4.3
5
4
3
5
June
3.2
4
3
2
3
July
2.8
3
4
2
3
August
2.3
3
2
2
1
September
3.1
3
3
3
3
October
3.4
4
3
4
3
November
3.9
4
5
4
4
December
3.2
3
3
2
3
Average
4.1
5.1
4.0
4.1
3.0
3.7
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
269°
265°
261°
278°
286°
February
255°
255°
247°
257°
255°
March
283°
275°
244°
282°
235°
April
229°
255°
277°
270°
May
331°
308°
260°
275°
June
267°
271°
207°
229°
July
245°
227°
222°
243°
August
273°
225°
158°
191°
September
347°
327°
240°
024°
October
269°
311°
274°
291°
November
300°
284°
291°
251°
December
274°
277°
232°
262°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.