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
August
0.0
0
0
0
September
0.0
0
0
0
October
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
-2.5
-2
-1
-2
0
-4
February
-3.7
0
-6
-3
-1
-2
March
1.3
3
1
0
3
1
April
6.1
5
6
10
5
May
10.1
10
10
11
11
June
16.9
17
17
19
20
July
20.5
23
20
22
August
17.8
20
21
22
September
13.9
18
17
18
October
9.8
12
13
12
November
4.1
3
4
12
6
December
1.0
2
3
0
4
Average
6.8
-1.9
8.6
9.0
5.8
9.4
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
-8.9
-9
-6
-9
-5
-10
February
-10.7
-7
-12
-11
-7
-10
March
-7.4
-3
-5
-6
-7
-10
April
-2.4
-1
0
2
-3
May
1.7
2
3
3
3
June
7.3
9
10
7
9
July
11.4
16
13
11
August
10.5
13
16
12
September
7.0
11
11
8
October
3.7
6
7
4
November
-1.3
-1
-1
6
-1
December
-4.5
-3
-2
-5
-2
Average
-1.7
-7.7
2.4
2.7
-2.3
0.9
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
August
0.0
0
0
0
September
0.0
0
0
0
October
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
6.2
8
7
8
4
5
February
7.2
7
7
8
7
8
March
6.8
7
7
8
6
7
April
6.2
7
7
7
7
May
6.0
7
6
6
6
June
5.0
5
6
5
4
July
5.1
5
7
4
August
5.2
6
6
5
September
5.9
6
7
7
October
6.3
7
7
6
November
7.6
7
8
8
7
December
7.4
8
8
9
6
Average
6.3
7.5
6.4
7.0
6.2
5.8
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
272°
273°
261°
265°
293°
February
260°
299°
256°
265°
247°
March
205°
359°
262°
226°
241°
April
310°
026°
103°
228°
May
283°
264°
261°
247°
June
174°
261°
238°
206°
July
216°
237°
224°
August
209°
236°
242°
September
238°
256°
236°
October
252°
241°
239°
November
258°
287°
200°
235°
December
294°
112°
306°
175°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.