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
71.7
60
73
82
February
84.5
77
80
99
March
86.8
78
79
95
April
94.4
99
0
91
May
98.4
99
98
June
99.3
99
100
July
98.0
100
95
August
95.9
98
88
September
96.9
97
100
92
October
76.1
54
82
November
85.2
88
81
December
71.4
71
40
68
Average
84.7
71.1
88.3
77.3
76.7
94.2
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
2020
January
8.3
8
7
10
February
10.8
11
11
13
March
11.8
14
7
15
April
18.6
19
16
21
May
22.5
25
22
June
26.3
29
23
July
34.0
36
34
August
31.0
34
30
September
26.7
27
26
29
October
20.1
23
17
November
12.4
14
13
December
6.9
9
5
5
Average
15.6
10.8
20.9
8.9
11.8
23.6
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
0.5
1
3
-3
February
-1.8
2
-2
2
March
0.5
1
-2
1
April
3.6
1
16
4
May
9.0
7
8
June
13.0
10
16
July
14.7
14
15
August
16.1
13
17
September
11.5
9
23
14
October
4.5
5
6
November
2.5
2
2
December
0.4
2
2
-1
Average
4.3
1.1
5.4
-2.9
2.9
9.3
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
February
0.0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
June
0.0
0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
0
0
0
October
0.0
0
0
November
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
2020
January
0.8
1
1
0
February
2.3
2
2
2
March
3.2
3
2
4
April
3.5
3
0
3
May
3.8
3
5
June
3.8
4
4
July
3.8
4
4
August
3.2
3
4
September
3.5
3
4
4
October
2.5
2
3
November
1.3
2
1
December
0.9
1
0
1
Average
2.2
2.0
2.7
0.3
1.6
3.6
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
194°
265°
147°
February
160°
222°
109°
March
155°
164°
152°
April
151°
360°
129°
May
151°
155°
June
158°
144°
July
165°
154°
August
165°
151°
September
166°
171°
163°
October
183°
180°
November
014°
167°
December
219°
360°
173°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.