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
89.6
83
86
94
91
95
February
90.7
87
95
98
87
88
March
88.9
95
86
95
89
79
April
96.4
96
99
100
93
94
May
88.6
92
95
90
88
June
97.3
95
98
97
98
July
93.1
91
87
94
94
August
96.6
99
98
98
97
September
95.2
93
95
97
95
October
94.1
96
99
94
92
November
94.1
94
97
99
98
December
92.3
91
91
98
90
Average
92.8
90.5
93.2
96.0
93.7
92.3
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
5.4
2
3
7
7
8
February
8.1
13
8
8
3
9
March
14.4
16
12
15
15
14
April
20.6
23
22
21
19
20
May
23.4
25
26
22
24
June
31.2
29
34
32
34
July
31.1
34
36
32
33
August
33.4
34
36
34
33
September
30.4
31
31
32
28
October
20.4
21
24
22
19
November
14.7
16
12
17
17
December
9.7
10
8
13
9
Average
19.6
13.4
20.4
21.3
20.6
20.7
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
-8.8
-9
-7
-8
-6
-5
February
-7.3
-2
-7
-8
-11
-5
March
-2.4
-1
-4
-3
-1
1
April
2.6
4
3
3
2
2
May
9.0
11
9
10
8
June
15.1
14
16
16
16
July
15.7
17
19
17
18
August
16.7
16
17
17
17
September
13.1
13
12
14
11
October
4.1
5
5
6
3
November
-2.3
-1
-4
0
-1
December
-5.4
-3
-7
-4
-5
Average
4.0
-3.8
4.8
4.0
5.2
5.1
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
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
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
9.7
8
9
10
11
10
February
10.4
9
12
11
9
12
March
12.1
11
12
13
13
12
April
13.6
14
14
16
13
12
May
10.8
10
12
12
11
June
10.8
8
12
10
13
July
9.3
8
11
9
10
August
9.1
9
9
10
10
September
10.2
9
9
10
10
October
10.4
10
10
10
10
November
11.1
10
12
10
12
December
11.0
10
15
10
11
Average
10.7
10.7
10.0
11.7
10.5
10.9
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
343°
354°
319°
346°
349°
February
333°
318°
348°
334°
344°
March
022°
005°
358°
360°
201°
April
348°
313°
316°
344°
358°
May
149°
073°
154°
092°
June
145°
198°
170°
199°
July
135°
169°
169°
163°
August
215°
164°
173°
176°
September
180°
152°
188°
165°
October
333°
294°
353°
018°
November
332°
321°
314°
264°
December
332°
302°
304°
338°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.