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
59.3
98
94
85
95
100
February
56.8
88
88
93
83
85
March
60.5
92
92
92
94
84
April
61.7
94
100
96
98
May
58.7
94
95
90
95
June
53.6
96
92
93
86
July
53.9
91
98
99
94
August
66.9
99
96
100
95
September
64.0
98
89
99
97
October
68.2
98
96
99
95
November
67.3
95
94
98
100
December
57.8
94
100
99
89
Average
61.7
92.5
94.3
93.9
95.5
92.9
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
3.4
4
4
8
5
7
February
3.8
10
8
5
2
4
March
7.4
13
10
11
11
13
April
10.0
17
18
15
16
May
12.6
21
23
18
23
June
15.0
24
28
28
29
July
16.6
30
30
29
30
August
20.2
29
29
30
31
September
19.3
26
27
27
25
October
12.1
18
18
19
17
November
8.7
13
9
15
14
December
4.9
9
6
11
5
Average
10.9
9.1
17.4
18.0
17.7
18.4
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
-7.6
-10
-8
-10
-6
-7
February
-7.6
-5
-9
-11
-10
-8
March
-5.5
-3
-6
-5
-3
-2
April
-3.7
-1
0
0
0
May
2.1
7
6
7
7
June
2.7
10
11
13
9
July
4.0
14
15
15
11
August
6.5
14
13
13
12
September
5.3
9
9
10
8
October
-2.6
2
2
2
-1
November
-5.5
-3
-7
-3
-3
December
-7.2
-7
-10
-6
-8
Average
-2.6
-6.0
2.0
1.5
2.7
2.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
6
9
21
1
0
February
11.3
17
14
13
14
18
March
8.3
10
4
24
9
8
April
5.1
9
3
2
7
May
5.1
3
9
12
2
June
2.7
10
2
2
3
July
2.2
4
4
1
3
August
2.0
1
5
1
1
September
2.6
6
4
0
4
October
5.7
4
3
2
5
November
4.8
7
15
1
1
December
3.3
6
1
2
6
Average
5.5
11.1
6.1
8.7
4.0
4.8
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
8.2
8
8
9
9
8
February
9.0
9
10
8
7
10
March
10.3
10
11
11
11
10
April
11.2
10
13
12
9
May
10.4
10
12
10
10
June
9.0
9
10
8
9
July
7.8
8
8
7
8
August
7.8
8
8
7
8
September
8.1
7
8
8
8
October
8.7
8
8
8
10
November
8.0
8
9
7
9
December
9.1
8
10
11
10
Average
9.0
9.2
8.7
9.5
8.8
9.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
351°
012°
358°
343°
208°
February
234°
324°
132°
191°
018°
March
302°
210°
006°
358°
214°
April
259°
234°
036°
327°
May
111°
195°
132°
110°
June
134°
180°
120°
203°
July
084°
116°
117°
123°
August
139°
126°
149°
115°
September
162°
143°
109°
064°
October
176°
167°
193°
137°
November
350°
104°
345°
218°
December
353°
209°
215°
009°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.