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
86.7
83
87
89
94
84
February
87.9
92
91
83
75
92
March
95.2
94
97
99
96
89
April
96.2
98
93
98
98
May
96.3
98
98
96
94
June
96.7
96
0
96
98
July
98.1
98
99
96
99
August
96.6
98
98
93
96
September
96.2
97
97
94
95
October
96.5
98
98
94
100
November
94.4
96
95
93
95
December
88.1
90
80
91
90
Average
93.7
89.8
95.7
94.6
93.3
94.3
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
9.4
7
12
8
9
12
February
12.9
16
17
13
7
10
March
17.6
19
17
19
19
18
April
20.9
21
21
21
20
May
25.3
25
26
24
24
June
29.6
29
17
30
30
July
31.6
31
33
31
33
August
30.6
31
31
31
29
September
28.4
29
28
27
24
October
22.2
23
21
23
19
November
15.3
18
17
15
17
December
13.3
13
14
17
11
Average
20.6
14.0
22.3
20.6
21.3
20.7
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
0.2
-2
2
-3
1
4
February
2.1
2
4
0
-1
5
March
6.0
7
5
6
7
9
April
8.8
9
10
8
8
May
14.5
14
18
12
14
June
18.9
17
14
19
20
July
21.4
21
23
21
22
August
20.5
20
20
21
21
September
17.2
16
15
15
21
October
10.9
11
7
14
13
November
3.2
4
4
1
6
December
2.7
2
5
6
-1
Average
9.7
2.3
10.4
9.1
10.3
11.7
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
6.7
7
8
6
7
6
February
7.2
7
8
8
6
6
March
7.8
8
8
9
7
8
April
6.8
7
8
7
6
May
5.6
5
6
5
6
June
5.5
5
0
6
6
July
4.8
5
6
5
4
August
4.7
5
5
5
4
September
4.5
5
5
4
4
October
5.6
6
7
5
5
November
5.7
6
5
6
6
December
6.0
6
6
7
6
Average
5.9
7.1
5.9
6.0
5.7
5.7
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
243°
229°
281°
252°
220°
February
232°
220°
227°
291°
250°
March
222°
245°
219°
216°
226°
April
238°
231°
242°
270°
May
258°
221°
206°
224°
June
256°
360°
203°
224°
July
232°
216°
219°
236°
August
280°
213°
215°
309°
September
004°
359°
245°
195°
October
250°
229°
215°
252°
November
229°
252°
228°
226°
December
229°
213°
211°
229°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.