Mt. Pisgah Parking Lot
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mt. Pisgah Parking Lot clear sky chart from 2005-11-06 to 2024-01-13.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
41%
24013
20%
74398
12%
23954
50%
23954
22%
47757

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
22%
760
22%
2459
8%
757
40%
757
18%
1496
January11th to 20thNight
23%
729
22%
2367
9%
729
38%
729
18%
1508
January21st to endNight
22%
792
25%
2574
9%
792
42%
792
19%
1562
February1st to 10thNight
25%
720
22%
2241
9%
720
39%
720
21%
1390
February11th to 20thNight
17%
703
21%
2098
6%
699
33%
699
16%
1373
February21st to endNight
19%
592
21%
1776
7%
592
33%
592
17%
1179
March1st to 10thNight
23%
720
23%
2034
9%
720
35%
720
21%
1290
March11th to 20thNight
26%
720
17%
1980
7%
720
34%
720
19%
1350
March21st to endNight
25%
792
16%
2178
6%
792
33%
792
19%
1486
April1st to 10thNight
28%
720
21%
1980
8%
720
40%
720
24%
1231
April11th to 20thNight
34%
607
23%
1771
11%
607
46%
607
27%
1085
April21st to endNight
41%
540
25%
1620
13%
540
51%
540
26%
992
May1st to 10thNight
38%
540
16%
1620
6%
540
45%
540
23%
1047
May11th to 20thNight
46%
531
12%
1593
7%
531
49%
531
20%
1097
May21st to endNight
60%
582
15%
1744
11%
582
61%
582
25%
1144
June1st to 10thNight
58%
540
12%
1620
9%
540
60%
540
22%
1102
June11th to 20thNight
63%
540
12%
1620
8%
540
65%
540
29%
1043
June21st to endNight
65%
540
14%
1620
11%
540
68%
540
28%
1049
July1st to 10thNight
66%
525
10%
1575
9%
525
67%
525
21%
1141
July11th to 20thNight
69%
522
10%
1566
7%
522
70%
522
21%
1116
July21st to endNight
68%
591
12%
1672
11%
558
70%
558
23%
1177
August1st to 10thNight
69%
537
10%
1600
9%
534
69%
534
21%
1155
August11th to 20thNight
64%
534
16%
1598
14%
534
65%
534
20%
1171
August21st to endNight
60%
633
14%
1957
13%
633
61%
633
20%
1374
September1st to 10thNight
59%
720
16%
1980
13%
720
60%
720
23%
1383
September11th to 20thNight
51%
720
18%
1980
15%
720
53%
720
21%
1404
September21st to endNight
53%
720
22%
1980
17%
720
58%
720
28%
1291
October1st to 10thNight
46%
720
24%
1998
17%
720
53%
720
27%
1288
October11th to 20thNight
40%
720
25%
2160
17%
720
51%
720
27%
1310
October21st to endNight
46%
792
31%
2376
21%
792
59%
792
31%
1351
November1st to 10thNight
47%
740
26%
2316
18%
740
58%
740
27%
1362
November11th to 20thNight
41%
760
27%
2470
20%
760
52%
760
26%
1429
November21st to endNight
40%
760
26%
2470
17%
760
53%
760
24%
1467
December1st to 10thNight
30%
760
21%
2470
10%
760
44%
760
17%
1632
December11th to 20thNight
33%
759
25%
2939
15%
758
46%
758
20%
1647
December21st to endNight
26%
832
14%
4396
10%
817
39%
817
11%
2635

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
11%7%36%6%46%6%6%8%38%
74894
Night
11%6%35%5%35%5%6%8%43%
74845
TransparencyDay
42%9%12%17%15%4
74617
Night
38%9%13%18%17%5%
74641
SeeingDay
19%16%24%21%14%7%
13899
Night
16%14%22%26%18%4
24020

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
8%7%26%5%345%5%8%46%
1706
11th to 20thDay
10%9%37%44436%6%43%
1638
21st to endDay
8%7%25%5%35%45%6%49%
1782
February1st to 10thDay
10%9%26%5%35%5%5%7%43%
1714
11th to 20thDay
11%7%47%5%345%5%6%43%
1748
21st to endDay
11%7%25%6%46%6%5%6%41%
1480
March1st to 10thDay
10%5%25%6%26%5%6%8%46%
1924
11th to 20thDay
14%8%36%5%46%5%5%6%38%
1980
21st to endDay
12%9%37%6%35%5%6%7%37%
2178
April1st to 10thDay
9%5%35%5%45%5%6%10%43%
1980
11th to 20thDay
12%7%35%6%35%5%5%8%41%
2151
21st to endDay
11%5%26%6%45%45%7%45%
2340
May1st to 10thDay
10%6%37%7%36%5%6%8%39%
2340
11th to 20thDay
14%7%37%7%5%7%5%6%7%31%
2301
21st to endDay
11%6%36%7%47%7%7%9%32%
2531
June1st to 10thDay
11%6%38%8%5%7%8%8%8%28%
2340
11th to 20thDay
8%6%37%7%5%8%7%8%9%32%
2340
21st to endDay
8%5%48%8%5%8%6%7%9%32%
2340
July1st to 10thDay
10%7%39%9%5%8%7%8%10%22%
2340
11th to 20thDay
12%7%37%8%6%9%9%7%9%24%
2340
21st to endDay
9%7%48%9%5%8%8%7%9%25%
2547
August1st to 10thDay
13%8%37%9%6%7%7%8%10%22%
2327
11th to 20thDay
13%7%38%8%5%7%7%7%9%24%
2303
21st to endDay
12%7%47%7%5%8%7%7%8%29%
2375
September1st to 10thDay
11%7%38%8%45%6%6%6%34%
1980
11th to 20thDay
17%7%37%6%46%5%5%7%32%
1980
21st to endDay
16%7%346%45%5%5%7%38%
1980
October1st to 10thDay
15%7%25%5%34445%46%
1961
11th to 20thDay
10%6%25%5%245%46%53%
1800
21st to endDay
12%5%25%42335%5%55%
1980
November1st to 10thDay
9%7%24324345%57%
1761
11th to 20thDay
8%5%25%4345%5%6%53%
1710
21st to endDay
10%5%36%4345%5%7%49%
1710
December1st to 10thDay
10%7%47%7%5%5%5%5%7%39%
1710
11th to 20thDay
10%4245%35%5%6%7%49%
2153
21st to endDay
15%5%345%35%5%5%6%44%
3124
January1st to 10thNight
9%5%35%6%36%5%5%6%46%
2459
11th to 20thNight
10%7%46%6%36%5%6%7%41%
2367
21st to endNight
9%7%35%5%35%5%5%6%47%
2574
February1st to 10thNight
8%6%35%5%45%5%6%7%45%
2241
11th to 20thNight
11%9%25%6%45%5%5%5%43%
2098
21st to endNight
10%6%35%7%46%5%7%7%39%
1776
March1st to 10thNight
8%7%25%6%35%5%6%7%45%
2034
11th to 20thNight
12%7%36%6%46%5%6%8%38%
1980
21st to endNight
11%7%36%5%36%6%6%8%38%
2178
April1st to 10thNight
8%5%36%5%3446%7%48%
1980
11th to 20thNight
10%6%35%434448%49%
1771
21st to endNight
8%6%25%5%345%5%6%50%
1620
May1st to 10thNight
11%6%245%45%6%7%7%43%
1620
11th to 20thNight
12%6%36%7%35%5%6%8%39%
1592
21st to endNight
11%6%25%5%36%6%6%10%41%
1744
June1st to 10thNight
8%5%26%6%46%6%9%13%34%
1620
11th to 20thNight
7%425%5%35%6%9%13%41%
1620
21st to endNight
7%4245%36%7%7%12%42%
1620
July1st to 10thNight
9%5%36%7%46%8%7%11%34%
1620
11th to 20thNight
8%6%35%5%47%7%9%13%33%
1620
21st to endNight
6%5%46%6%47%7%9%11%35%
1771
August1st to 10thNight
9%5%25%6%46%8%7%12%35%
1611
11th to 20thNight
11%7%26%7%47%6%8%8%36%
1598
21st to endNight
11%7%36%7%45%7%7%9%35%
1957
September1st to 10thNight
12%6%45%5%45%5%7%8%38%
1980
11th to 20thNight
16%9%36%5%3436%8%36%
1980
21st to endNight
15%7%24434447%46%
1980
October1st to 10thNight
16%7%245%34335%48%
1998
11th to 20thNight
12%6%35%42445%6%49%
2160
21st to endNight
11%4234345%45%55%
2376
November1st to 10thNight
11%6%24435%5%5%5%51%
2316
11th to 20thNight
10%6%25%435%447%50%
2470
21st to endNight
11%5%245%35%6%6%6%47%
2470
December1st to 10thNight
10%7%36%7%46%6%6%8%39%
2470
11th to 20thNight
12%7%36%5%24446%48%
3042
21st to endNight
16%7%45%5%35%5%6%7%37%
4532

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
34%8%10%20%21%6%
1707
11th to 20thDay
42%6%8%17%21%7%
1638
21st to endDay
35%5%9%20%23%8%
1782
February1st to 10thDay
40%6%9%20%18%7%
1714
11th to 20thDay
41%8%9%17%19%6%
1758
21st to endDay
42%7%10%15%16%9%
1480
March1st to 10thDay
34%7%10%19%21%8%
1924
11th to 20thDay
44%9%10%15%15%6%
1980
21st to endDay
46%8%11%18%15%3
2178
April1st to 10thDay
35%8%12%21%18%5%
1980
11th to 20thDay
40%7%11%16%20%6%
2151
21st to endDay
36%9%12%24%16%2
2340
May1st to 10thDay
41%10%12%20%14%2
2340
11th to 20thDay
49%12%12%16%11%1
2305
21st to endDay
43%13%14%20%10%1
2531
June1st to 10thDay
48%14%15%17%6%1
2340
11th to 20thDay
44%13%17%14%10%1
2340
21st to endDay
45%12%14%17%10%2
2340
July1st to 10thDay
52%13%15%13%6%1
2275
11th to 20thDay
51%15%17%10%7%1
2271
21st to endDay
48%14%17%14%6%1
2405
August1st to 10thDay
53%14%15%15%4
2314
11th to 20thDay
52%13%15%13%6%1
2303
21st to endDay
50%11%15%16%7%2
2375
September1st to 10thDay
47%10%11%17%13%3
1980
11th to 20thDay
50%8%10%16%15%2
1980
21st to endDay
44%8%11%18%15%5%
1980
October1st to 10thDay
38%6%11%17%22%6%
1961
11th to 20thDay
31%6%9%22%22%10%
1800
21st to endDay
31%410%21%24%10%
1980
November1st to 10thDay
30%5%8%18%29%10%
1761
11th to 20thDay
31%6%7%20%27%9%
1710
21st to endDay
33%6%8%20%25%7%
1710
December1st to 10thDay
45%8%7%19%15%7%
1710
11th to 20thDay
32%7%10%16%25%11%
2150
21st to endDay
38%7%9%21%21%5%
3124
January1st to 10thNight
36%7%11%18%20%7%
2459
11th to 20thNight
40%7%11%14%22%5%
2367
21st to endNight
36%6%8%19%24%6%
2574
February1st to 10thNight
36%7%13%19%19%6%
2241
11th to 20thNight
41%7%8%20%18%6%
2099
21st to endNight
39%10%12%15%18%6%
1776
March1st to 10thNight
36%7%12%15%21%8%
2034
11th to 20thNight
40%10%13%17%15%4
1980
21st to endNight
41%9%13%20%15%2
2178
April1st to 10thNight
33%8%12%23%21%3
1980
11th to 20thNight
34%6%12%21%21%5%
1771
21st to endNight
33%9%13%26%18%2
1620
May1st to 10thNight
36%10%17%22%13%2
1620
11th to 20thNight
42%11%17%19%11%1
1593
21st to endNight
37%12%17%25%8%1
1745
June1st to 10thNight
38%15%20%20%6%1
1620
11th to 20thNight
33%12%26%21%8%1
1620
21st to endNight
32%14%22%18%11%3
1620
July1st to 10thNight
42%14%19%15%8%1
1575
11th to 20thNight
39%17%23%13%6%2
1566
21st to endNight
37%17%20%18%7%1
1672
August1st to 10thNight
41%16%20%17%7%
1600
11th to 20thNight
44%15%16%15%10%1
1598
21st to endNight
42%13%18%19%6%1
1957
September1st to 10thNight
41%12%14%19%11%2
1980
11th to 20thNight
46%9%12%17%15%1
1980
21st to endNight
40%6%11%23%17%4
1980
October1st to 10thNight
38%6%11%19%22%4
1998
11th to 20thNight
35%7%11%21%19%7%
2160
21st to endNight
31%5%9%20%26%9%
2376
November1st to 10thNight
33%7%9%18%23%10%
2316
11th to 20thNight
33%6%8%17%25%10%
2470
21st to endNight
35%7%8%20%23%8%
2470
December1st to 10thNight
42%9%12%15%16%6%
2470
11th to 20thNight
33%7%12%14%25%9%
3044
21st to endNight
42%7%10%17%20%4
4532

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
27%31%33%8%1
270
11th to 20thDay
28%27%30%12%2
246
21st to endDay
22%39%30%7%2
264
February1st to 10thDay
28%32%30%8%2
240
11th to 20thDay
38%35%25%3
240
21st to endDay
33%39%21%7%1
198
March1st to 10thDay
22%28%30%14%5%
364
11th to 20thDay
28%27%27%12%41
420
21st to endDay
24%26%29%16%5%
462
April1st to 10thDay
21%23%28%20%7%1
420
11th to 20thDay
19%25%24%20%10%2
412
21st to endDay
20%19%27%19%11%3
420
May1st to 10thDay
14%23%30%19%8%5%
423
11th to 20thDay
16%13%25%25%13%8%
447
21st to endDay
16%9%19%29%15%12%
485
June1st to 10thDay
16%8%23%26%17%11%
450
11th to 20thDay
12%8%21%22%25%12%
450
21st to endDay
10%8%28%24%18%12%
450
July1st to 10thDay
11%415%27%27%16%
445
11th to 20thDay
10%413%27%25%20%
444
21st to endDay
9%414%26%28%19%
488
August1st to 10thDay
19%5%16%25%17%18%
446
11th to 20thDay
12%5%13%29%25%16%
439
21st to endDay
16%316%25%25%15%
495
September1st to 10thDay
14%415%29%27%11%
450
11th to 20thDay
20%6%14%26%26%9%
450
21st to endDay
21%6%18%30%19%5%
450
October1st to 10thDay
23%10%17%23%18%8%
450
11th to 20thDay
13%18%26%25%15%3
450
21st to endDay
19%17%24%28%10%3
495
November1st to 10thDay
19%16%31%21%11%2
359
11th to 20thDay
19%25%35%16%4
270
21st to endDay
17%27%37%12%7%1
270
December1st to 10thDay
26%29%34%9%2
270
11th to 20thDay
19%27%36%14%31
270
21st to endDay
25%22%39%9%41
297
January1st to 10thNight
17%28%30%20%5%1
760
11th to 20thNight
19%21%33%21%5%
729
21st to endNight
17%26%32%21%4
792
February1st to 10thNight
15%24%32%24%5%
720
11th to 20thNight
22%26%33%17%2
703
21st to endNight
19%29%31%19%3
592
March1st to 10thNight
16%26%31%22%4
720
11th to 20thNight
20%22%30%20%8%1
720
21st to endNight
20%21%31%19%9%1
792
April1st to 10thNight
16%24%29%22%8%1
720
11th to 20thNight
17%18%26%25%11%2
607
21st to endNight
12%16%27%30%14%1
540
May1st to 10thNight
13%15%29%26%15%2
540
11th to 20thNight
16%8%21%31%21%3
531
21st to endNight
14%414%28%33%8%
584
June1st to 10thNight
11%116%36%29%6%
540
11th to 20thNight
9%414%26%34%12%
540
21st to endNight
7%315%32%34%8%
540
July1st to 10thNight
12%28%23%47%9%
525
11th to 20thNight
11%27%24%42%13%
522
21st to endNight
7%28%27%43%13%
591
August1st to 10thNight
11%28%28%40%10%
537
11th to 20thNight
13%29%28%39%9%
534
21st to endNight
15%210%23%40%10%
633
September1st to 10thNight
14%5%10%27%35%8%
720
11th to 20thNight
22%5%9%27%31%6%
720
21st to endNight
19%7%14%32%26%3
720
October1st to 10thNight
19%10%17%23%24%8%
720
11th to 20thNight
19%11%24%26%17%3
720
21st to endNight
14%15%21%33%14%3
792
November1st to 10thNight
16%12%20%30%19%3
740
11th to 20thNight
16%19%20%32%11%2
760
21st to endNight
17%17%23%30%12%1
760
December1st to 10thNight
18%21%26%28%7%
760
11th to 20thNight
16%18%29%30%7%1
760
21st to endNight
22%19%28%27%4
836
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