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
97.1
93
100
February
100.0
100
100
March
96.5
85
100
100
100
April
96.8
92
100
100
100
May
100.0
100
100
100
June
90.6
100
100
82
July
80.7
0
91
100
100
August
98.1
0
100
100
September
99.8
100
100
October
90.7
0
100
100
November
91.1
0
0
100
100
December
100.0
100
100
Average
75.5
90.1
90.3
99.9
97.5
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
6.5
6
7
February
-1.4
4
-4
March
10.8
3
14
13
7
April
13.5
16
3
14
12
May
18.0
19
16
19
June
25.9
25
28
25
July
31.7
33
32
34
30
August
30.1
35
28
32
September
25.5
27
24
October
14.3
10
18
13
November
11.1
13
6
13
10
December
8.0
17
7
Average
18.2
12.2
29.3
13.7
17.2
18.9
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
-6
-3
February
-11.0
-7
-14
March
-2.5
-5
4
-2
-1
April
0.7
1
-3
2
0
May
6.1
6
6
7
June
11.7
12
13
11
July
15.1
16
16
18
12
August
13.5
20
14
13
September
8.7
9
9
October
2.9
6
5
0
November
0.0
-1
1
0
-1
December
-2.2
7
-3
Average
4.8
-1.3
12.9
3.0
3.8
5.3
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
February
0.0
0
0
March
4.7
22
0
0
0
April
2.9
8
0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
Average
2.2
11.1
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
9.8
10
10
February
9.3
10
9
March
8.4
7
11
8
11
April
9.0
10
10
9
9
May
8.0
11
7
8
June
7.6
10
7
7
July
5.5
6
5
5
6
August
6.1
7
7
6
September
6.8
6
8
October
7.1
7
7
7
November
10.1
8
10
10
11
December
9.0
14
9
Average
7.8
9.1
6.0
9.3
7.4
7.5
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
187°
191°
February
221°
195°
March
085°
190°
195°
335°
April
278°
323°
217°
207°
May
198°
216°
164°
June
190°
188°
204°
July
162°
190°
354°
190°
August
236°
216°
190°
September
199°
202°
October
200°
200°
204°
November
177°
212°
194°
193°
December
208°
195°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.