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
95.3
91
95
99
97
97
February
98.1
96
100
99
100
100
March
96.0
98
90
98
95
97
April
99.7
100
100
100
100
May
99.0
99
100
100
99
June
98.5
97
100
99
99
July
99.0
98
99
100
98
August
99.5
99
100
100
100
September
98.6
97
99
99
100
October
99.3
100
100
99
99
November
98.4
99
99
100
99
December
98.2
100
99
98
99
Average
97.9
94.7
97.6
99.1
98.7
98.8
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
2020
January
8.6
9
7
11
7
10
February
11.9
12
8
12
12
13
March
14.1
15
10
17
14
14
April
21.6
21
23
23
21
May
25.6
25
27
27
28
June
31.1
29
33
32
32
July
33.5
37
35
32
28
August
33.3
31
33
34
35
September
29.8
28
31
30
32
October
22.0
24
24
19
21
November
15.4
16
12
19
16
December
9.0
12
7
9
10
Average
20.1
11.6
21.2
22.5
21.4
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
-5.8
-4
-3
-5
-4
-5
February
-4.6
-1
-1
-6
-3
-4
March
-1.9
0
-1
-1
-1
1
April
3.0
2
2
4
4
May
6.2
6
6
6
7
June
11.6
8
13
16
12
July
16.6
14
16
20
19
August
15.0
15
17
16
13
September
11.6
10
13
13
12
October
4.4
4
6
5
3
November
-1.4
0
-4
1
-1
December
-4.9
-3
-5
-1
-6
Average
3.9
-2.4
4.6
4.8
5.8
3.6
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
5.6
5
6
7
6
6
February
6.9
6
9
8
7
7
March
7.5
8
7
7
8
7
April
8.0
8
10
8
7
May
7.5
7
10
8
8
June
7.3
7
8
6
9
July
5.4
5
6
5
7
August
5.3
5
5
6
7
September
5.4
5
5
6
5
October
5.8
6
5
6
7
November
5.8
6
7
5
7
December
5.9
6
5
7
6
Average
6.4
6.2
6.0
6.9
6.6
7.0
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
025°
264°
040°
059°
069°
February
259°
214°
023°
262°
263°
March
233°
247°
288°
224°
228°
April
246°
243°
251°
242°
May
218°
248°
238°
231°
June
236°
238°
234°
236°
July
256°
236°
225°
241°
August
272°
288°
234°
237°
September
253°
189°
223°
049°
October
274°
075°
232°
291°
November
026°
139°
104°
098°
December
056°
213°
233°
049°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.