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
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
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
3.1
0
6
3
4
3
February
7.1
14
9
7
-1
6
March
13.0
16
11
14
15
14
April
18.6
21
18
19
17
May
24.5
27
25
22
22
June
30.3
31
31
30
30
July
31.4
32
32
30
32
August
29.6
29
31
30
29
September
27.5
28
27
29
25
October
19.6
20
22
21
18
November
12.2
13
12
15
16
December
8.0
9
7
13
7
Average
17.7
9.9
19.8
19.4
19.0
18.2
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
-6.3
-8
-2
-8
-4
-5
February
-5.3
-1
-3
-6
-11
-4
March
2.0
4
1
1
3
4
April
6.0
6
6
7
4
May
13.4
13
15
13
12
June
18.6
17
20
19
19
July
20.4
19
21
20
21
August
19.0
20
20
20
18
September
15.6
15
16
16
13
October
7.9
9
6
11
6
November
0.7
1
0
3
3
December
-3.7
1
-2
0
-5
Average
6.5
-2.3
8.1
7.7
8.1
7.3
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
6.1
5
6
6
6
6
February
6.6
6
7
7
6
6
March
7.4
8
7
8
8
7
April
7.5
8
8
7
7
May
5.3
4
6
5
5
June
4.8
4
4
4
5
July
4.1
4
4
4
4
August
4.2
4
4
5
4
September
4.6
4
4
5
5
October
5.5
5
5
5
6
November
6.1
5
7
6
7
December
6.0
6
6
7
5
Average
5.7
6.5
5.2
5.7
5.5
5.5
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
279°
290°
296°
311°
249°
February
212°
215°
269°
358°
329°
March
210°
278°
303°
163°
187°
April
225°
219°
226°
253°
May
132°
157°
158°
090°
June
115°
189°
175°
175°
July
205°
176°
143°
155°
August
152°
173°
174°
169°
September
167°
158°
187°
172°
October
229°
214°
143°
200°
November
186°
240°
225°
205°
December
226°
184°
198°
271°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.