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
82.6
73
79
85
86
89
February
90.0
96
93
92
89
81
March
88.2
89
85
91
96
86
April
89.8
96
95
94
88
May
93.2
98
93
96
94
June
94.4
87
99
99
98
July
98.1
98
99
96
99
August
93.2
95
99
97
99
September
92.4
99
93
98
95
October
94.1
95
99
95
94
November
93.8
96
93
96
93
December
88.3
86
93
91
90
Average
91.1
86.1
92.4
94.5
94.6
92.6
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
2.0
2
5
-1
1
5
February
4.7
7
7
3
0
3
March
7.7
11
6
9
11
10
April
13.2
15
12
15
11
May
19.6
19
21
19
19
June
21.6
23
25
25
25
July
26.6
26
27
25
28
August
25.7
24
27
27
26
September
23.1
22
22
24
22
October
17.3
17
17
19
16
November
9.1
10
11
9
13
December
4.6
8
4
8
4
Average
13.6
6.2
15.1
15.2
15.4
15.0
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
-4.8
-3
-1
-8
-3
-2
February
-4.8
-2
-2
-5
-6
-3
March
-1.3
2
-1
-1
1
1
April
3.9
5
4
5
3
May
9.7
8
12
9
10
June
13.3
13
16
17
15
July
18.0
17
18
18
19
August
16.9
16
17
18
17
September
14.3
14
14
14
13
October
8.8
10
7
12
8
November
2.2
2
3
2
5
December
-1.6
3
0
1
-1
Average
5.7
-1.0
7.0
6.6
7.4
7.0
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
8.1
9
7
7
8
8
February
8.7
8
9
9
9
9
March
8.6
8
9
8
9
8
April
7.9
8
8
7
8
May
6.9
7
7
6
8
June
6.2
6
7
6
6
July
5.8
5
7
6
6
August
5.6
6
6
5
6
September
6.3
5
7
7
7
October
6.5
6
8
6
7
November
8.2
7
9
9
10
December
8.1
7
8
8
9
Average
7.3
8.4
6.7
7.3
7.0
7.4
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
248°
259°
274°
276°
255°
February
281°
258°
254°
277°
278°
March
260°
281°
267°
282°
275°
April
274°
279°
281°
300°
May
008°
204°
326°
301°
June
326°
284°
257°
302°
July
290°
277°
301°
300°
August
315°
300°
300°
298°
September
358°
299°
283°
247°
October
268°
255°
268°
252°
November
253°
246°
258°
258°
December
244°
236°
242°
261°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.