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
93.4
92
91
100
97
98
February
96.6
97
99
97
96
100
March
93.2
87
92
98
93
97
April
97.7
99
99
97
100
May
97.8
99
99
94
99
June
99.5
100
100
100
99
July
99.6
100
99
99
100
August
95.8
99
11
94
99
September
98.9
99
100
100
October
97.5
95
99
95
100
November
97.7
95
98
100
99
December
95.1
98
95
91
97
Average
96.6
93.0
97.2
97.0
96.5
99.1
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
4.6
6
2
5
5
7
February
6.7
8
4
7
7
9
March
10.5
8
5
13
11
11
April
16.6
14
17
17
18
May
21.3
21
24
20
24
June
28.9
24
30
32
28
July
33.8
35
34
34
34
August
31.4
31
5
33
33
September
26.6
26
27
29
October
18.9
21
20
16
22
November
11.6
11
8
14
12
December
4.9
9
2
5
4
Average
16.3
7.2
17.6
16.7
16.6
19.1
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
-9.9
-6
-10
-10
-9
-6
February
-8.6
-4
-12
-9
-6
-8
March
-4.5
-3
-4
-3
-5
-2
April
-2.7
-1
-2
-4
-2
May
2.9
4
3
4
3
June
6.7
5
7
10
6
July
11.8
9
12
14
10
August
10.4
11
0
12
12
September
5.6
5
8
6
October
-2.1
-1
-1
0
-1
November
-6.4
-5
-8
-4
-6
December
-9.1
-6
-11
-9
-12
Average
-1.2
-5.3
-1.9
-2.6
-1.6
-1.8
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
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
3.7
5
5
2
2
4
February
5.4
6
5
3
6
5
March
6.0
8
7
6
6
6
April
6.4
7
7
6
7
May
6.0
7
6
5
6
June
5.3
5
5
6
5
July
4.2
2
5
5
4
August
3.4
0
1
4
4
September
5.0
4
7
5
October
4.3
4
4
5
4
November
3.6
4
6
2
4
December
3.4
4
5
4
2
Average
4.9
5.8
4.4
5.0
4.7
4.5
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
044°
170°
272°
034°
268°
February
005°
330°
347°
312°
333°
March
008°
291°
294°
048°
234°
April
317°
286°
318°
271°
May
005°
293°
291°
228°
June
028°
216°
191°
240°
July
011°
178°
180°
227°
August
360°
193°
191°
255°
September
349°
180°
339°
October
070°
346°
208°
307°
November
009°
222°
284°
214°
December
350°
156°
212°
331°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.