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
90.9
96
80
84
94
99
February
87.5
82
92
91
91
83
March
92.8
93
93
89
91
93
April
91.5
84
91
100
91
91
May
90.0
86
91
87
98
June
98.4
94
99
100
100
July
98.8
98
99
100
100
August
97.8
98
97
100
100
September
97.1
98
94
100
96
October
93.2
94
94
100
94
November
92.9
96
95
98
96
December
95.6
95
96
99
94
Average
93.4
88.4
92.8
94.2
95.9
95.4
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
6.9
5
2
8
8
9
February
7.3
11
8
7
3
5
March
12.5
13
10
13
11
13
April
17.1
17
17
18
15
17
May
21.3
21
22
20
24
June
28.3
23
29
30
30
July
31.5
30
33
32
32
August
30.8
30
31
32
33
September
27.6
27
29
29
27
October
18.2
19
19
20
19
November
13.1
14
10
16
15
December
9.0
10
8
12
8
Average
17.8
11.4
17.6
19.2
19.1
19.2
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
-6.1
-7
-7
-6
-5
-5
February
-6.1
-2
-6
-8
-9
-7
March
-2.4
-1
-5
-3
-1
0
April
1.9
4
1
2
1
1
May
6.9
8
6
7
8
June
12.9
12
13
14
13
July
16.4
16
18
17
16
August
15.5
15
17
16
16
September
11.6
11
12
12
10
October
3.2
4
5
5
3
November
-1.0
0
-4
1
0
December
-5.8
-2
-6
-3
-5
Average
3.5
-2.4
4.0
4.2
4.7
4.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.8
5
16
16
6
1
February
10.8
12
9
13
10
19
March
7.0
9
3
16
12
4
April
8.5
16
11
1
9
12
May
8.2
9
7
10
3
June
2.3
7
2
1
2
July
1.0
1
2
0
1
August
1.4
2
3
0
1
September
1.7
2
3
0
4
October
5.2
5
3
1
4
November
5.9
9
7
2
2
December
4.7
5
5
3
6
Average
5.9
10.6
6.3
6.1
4.2
4.7
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
7.1
7
7
7
7
8
February
8.0
7
9
7
7
9
March
8.7
7
9
9
8
8
April
8.8
8
9
11
8
8
May
8.1
8
10
8
8
June
7.5
7
8
6
9
July
6.8
7
7
6
8
August
6.8
7
7
7
7
September
6.9
6
7
7
7
October
7.0
7
7
7
7
November
7.3
7
7
7
8
December
7.4
6
10
9
7
Average
7.5
7.4
7.3
7.9
7.2
7.7
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
327°
132°
071°
198°
219°
February
266°
118°
167°
350°
145°
March
067°
060°
352°
160°
012°
April
316°
278°
275°
007°
347°
May
047°
183°
134°
088°
June
126°
193°
162°
186°
July
068°
291°
065°
205°
August
134°
313°
326°
315°
September
168°
164°
107°
118°
October
101°
276°
200°
038°
November
198°
127°
264°
197°
December
294°
218°
229°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.