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
January
88.3
85
82
93
February
90.0
94
89
89
March
89.9
84
91
92
April
94.6
89
98
May
88.6
93
87
June
95.7
94
97
July
94.6
96
93
August
97.9
97
99
September
92.7
91
93
October
94.2
95
94
100
November
92.0
97
91
100
December
88.0
90
84
95
Average
91.7
87.4
92.1
92.4
94.8
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
January
11.9
12
14
10
February
15.5
15
17
15
March
18.6
19
18
19
April
22.2
23
22
May
24.5
23
26
June
28.8
28
30
July
31.6
32
32
August
30.4
31
30
September
26.2
26
27
October
21.6
23
21
20
November
17.4
17
18
11
December
14.0
15
11
16
Average
18.7
15.1
21.9
22.0
15.7
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
2.9
3
6
0
February
5.6
5
8
4
March
8.1
9
8
8
April
11.5
12
11
May
15.6
15
17
June
19.1
18
20
July
22.5
23
22
August
21.7
22
21
September
18.0
18
18
October
12.0
13
11
17
November
7.7
7
9
3
December
5.6
6
5
7
Average
9.3
5.6
12.6
12.5
6.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
0.0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
May
0.0
0
0
June
0.0
0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
December
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
January
8.0
9
7
8
February
8.0
8
9
8
March
8.4
8
8
9
April
8.1
8
8
May
7.9
9
7
June
6.4
7
6
July
6.1
6
6
August
5.6
6
5
September
6.4
7
6
October
6.0
6
6
9
November
6.8
6
7
7
December
6.0
6
6
7
Average
7.2
8.3
7.0
6.8
6.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
286°
262°
302°
February
280°
255°
212°
March
302°
284°
240°
April
220°
252°
May
011°
171°
June
276°
276°
July
241°
215°
August
271°
228°
September
009°
011°
October
313°
012°
214°
November
003°
338°
233°
December
287°
349°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.