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
88.5
89
87
90
90
92
February
85.9
94
86
86
73
86
March
93.3
94
94
97
94
88
April
95.1
94
98
98
97
May
96.3
97
95
96
96
June
96.0
94
98
95
98
July
96.8
0
99
95
97
August
94.8
99
95
88
97
September
96.2
96
99
93
97
October
94.3
95
98
93
93
November
93.1
95
95
93
93
December
87.3
89
81
89
91
Average
93.2
92.2
93.1
94.9
91.9
93.9
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
10.4
8
14
9
10
12
February
14.4
16
17
14
10
12
March
17.8
18
18
19
19
19
April
21.4
21
21
21
20
May
25.7
25
27
24
24
June
28.8
28
30
29
29
July
30.8
30
33
30
31
August
29.9
31
30
30
30
September
27.9
28
27
27
27
October
22.5
23
21
23
23
November
16.0
18
17
15
18
December
12.8
14
13
17
11
Average
20.5
14.0
20.8
21.7
21.1
21.3
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
0.9
-2
4
-2
1
4
February
3.7
3
6
1
0
3
March
6.4
7
6
6
7
10
April
9.2
10
9
8
8
May
15.1
14
17
13
14
June
18.2
17
18
19
18
July
21.0
27
23
20
21
August
20.1
21
20
21
21
September
16.5
16
14
16
17
October
11.0
11
7
13
12
November
4.0
4
5
2
6
December
3.0
3
5
7
0
Average
9.7
2.8
9.6
10.4
10.7
11.1
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
6.5
7
7
7
6
6
February
6.9
6
8
8
7
7
March
7.1
6
7
8
7
7
April
6.7
7
8
6
7
May
5.6
6
6
6
6
June
4.9
5
5
6
6
July
4.0
0
5
4
4
August
3.8
0
4
4
4
September
3.9
0
6
4
5
October
4.7
0
6
5
5
November
5.4
4
6
6
6
December
6.1
7
6
7
6
Average
5.5
6.2
4.7
6.2
5.7
5.6
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
202°
229°
322°
251°
190°
February
224°
237°
197°
329°
235°
March
221°
242°
218°
137°
227°
April
229°
220°
265°
305°
May
186°
214°
203°
206°
June
259°
182°
189°
242°
July
360°
247°
228°
226°
August
360°
218°
158°
204°
September
360°
051°
072°
157°
October
360°
202°
205°
165°
November
136°
064°
282°
152°
December
202°
207°
216°
222°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.