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
82.6
63
83
96
89
80
February
92.4
90
98
98
93
95
March
90.3
95
90
94
89
78
April
95.6
96
99
98
96
98
May
93.8
95
88
94
95
June
98.7
99
97
99
100
July
97.6
97
97
98
96
August
97.1
98
98
98
98
September
94.6
93
100
98
90
October
93.7
99
99
96
93
November
93.2
87
96
97
97
December
92.8
87
83
99
95
Average
93.0
85.8
94.0
95.5
95.4
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
6.1
2
6
8
8
6
February
9.2
15
11
10
3
9
March
15.2
17
13
15
17
16
April
20.9
23
22
21
19
20
May
25.5
27
26
23
23
June
32.5
31
32
33
33
July
33.8
34
34
33
33
August
32.6
35
35
34
32
September
29.8
32
31
30
27
October
21.0
22
23
23
19
November
14.0
15
13
16
17
December
9.3
10
8
13
10
Average
20.0
13.9
21.5
21.7
21.1
20.4
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
-6.9
-7
-4
-8
-3
-4
February
-5.7
0
-5
-7
-9
-4
March
1.9
1
1
0
4
4
April
6.4
8
6
7
6
5
May
13.4
13
15
13
12
June
19.2
18
20
20
20
July
21.3
21
22
20
22
August
19.9
21
20
21
19
September
16.4
17
16
15
13
October
7.7
9
7
9
6
November
1.0
1
0
2
3
December
-3.2
0
-3
-2
-3
Average
7.0
0.2
8.2
7.7
8.1
7.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.8
13
6
3
3
7
February
4.0
3
1
4
8
4
March
4.3
3
4
8
7
2
April
4.0
1
2
1
4
4
May
4.7
2
10
5
8
June
2.6
5
5
0
2
July
1.4
1
1
0
4
August
1.9
1
2
1
1
September
2.8
4
3
1
5
October
4.8
2
2
4
3
November
4.4
10
4
0
3
December
4.6
11
2
0
5
Average
3.8
4.9
3.8
3.6
2.8
3.8
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
9.7
9
9
10
11
10
February
10.7
11
11
11
11
10
March
12.3
12
12
13
13
11
April
12.9
14
13
15
13
11
May
9.9
9
12
10
10
June
10.2
8
11
8
13
July
8.8
8
9
9
8
August
8.4
8
8
10
8
September
9.7
9
9
9
9
October
10.6
12
9
10
10
November
10.8
9
13
10
12
December
9.8
10
11
10
9
Average
10.4
11.4
9.8
10.8
10.3
10.0
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
332°
331°
312°
314°
313°
February
254°
261°
327°
358°
338°
March
341°
329°
348°
186°
197°
April
246°
242°
226°
274°
317°
May
145°
139°
133°
041°
June
128°
179°
167°
180°
July
145°
135°
148°
148°
August
226°
147°
167°
156°
September
159°
155°
181°
180°
October
226°
237°
292°
203°
November
146°
267°
248°
211°
December
293°
230°
229°
313°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.