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
January
95.5
96
97
94
February
94.3
92
96
95
March
98.1
98
97
99
April
98.2
100
97
May
98.9
100
99
June
98.7
99
July
98.6
98
99
99
August
99.4
100
99
99
September
97.7
96
100
October
95.2
93
96
November
97.6
100
94
99
December
96.3
99
94
95
Average
97.4
96.6
97.8
96.8
98.2
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
January
0.0
-1
1
1
February
3.3
4
3
3
March
8.6
9
4
11
April
12.9
16
10
May
18.8
25
17
June
22.5
23
July
31.7
32
31
33
August
30.0
32
32
28
September
26.1
26
27
October
17.0
19
16
November
5.9
8
-1
11
December
2.5
5
-3
4
Average
12.1
6.9
8.8
14.1
18.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-12.2
-14
-9
-12
February
-9.2
-7
-10
-10
March
-5.4
-4
-7
-3
April
-2.0
0
-4
May
4.1
8
3
June
8.6
9
July
10.8
11
10
13
August
10.1
17
11
9
September
5.3
7
3
October
2.5
3
3
November
-8.6
-6
-14
-2
December
-10.7
-8
-13
-8
Average
-3.5
-7.9
-5.3
-2.8
2.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
0.0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
May
0.0
0
0
June
0.0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
October
0.0
0
0
November
0.0
0
0
0
December
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
January
3.5
3
4
4
February
5.3
4
7
5
March
5.1
4
4
7
April
4.9
5
5
May
3.5
1
4
June
3.8
4
July
2.1
3
2
1
August
2.2
2
2
3
September
2.0
2
3
October
3.6
1
5
November
3.9
3
4
5
December
5.7
3
5
9
Average
3.9
4.0
3.7
3.7
4.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
219°
215°
227°
February
203°
232°
230°
March
216°
226°
236°
April
280°
252°
May
002°
250°
June
232°
July
327°
233°
209°
August
090°
261°
257°
September
278°
245°
October
194°
220°
November
234°
214°
234°
December
210°
201°
208°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.