Indian Trail
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indian Trail 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
47%
24315
21%
74361
14%
24265
55%
24265
27%
46840

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
28%
758
22%
2459
9%
757
44%
757
24%
1516
January11th to 20thNight
31%
729
24%
2367
12%
729
47%
729
24%
1464
January21st to endNight
29%
792
28%
2574
14%
792
48%
792
27%
1540
February1st to 10thNight
31%
720
20%
2340
12%
720
42%
720
25%
1459
February11th to 20thNight
22%
700
22%
2138
8%
699
39%
699
23%
1397
February21st to endNight
26%
592
26%
1711
10%
592
42%
592
26%
1107
March1st to 10thNight
33%
720
27%
1980
14%
720
44%
720
31%
1221
March11th to 20thNight
31%
720
21%
1980
11%
720
40%
720
27%
1293
March21st to endNight
33%
792
19%
2178
9%
792
42%
792
24%
1463
April1st to 10thNight
37%
720
24%
1971
11%
720
47%
720
31%
1216
April11th to 20thNight
42%
711
24%
1775
10%
711
50%
711
37%
1113
April21st to endNight
47%
628
25%
1708
13%
628
54%
628
34%
1042
May1st to 10thNight
45%
540
19%
1620
10%
540
51%
540
30%
979
May11th to 20thNight
47%
531
15%
1593
8%
531
51%
531
22%
1097
May21st to endNight
64%
582
17%
1745
14%
582
66%
582
27%
1134
June1st to 10thNight
59%
540
15%
1620
13%
540
61%
540
24%
1103
June11th to 20thNight
60%
540
14%
1620
11%
540
62%
540
26%
1082
June21st to endNight
66%
540
13%
1620
10%
540
67%
540
24%
1081
July1st to 10thNight
67%
525
11%
1575
10%
525
67%
525
23%
1093
July11th to 20thNight
74%
522
12%
1566
10%
522
74%
522
26%
1046
July21st to endNight
68%
591
14%
1672
11%
558
69%
558
24%
1150
August1st to 10thNight
66%
537
13%
1600
12%
534
66%
534
23%
1114
August11th to 20thNight
62%
534
15%
1598
13%
534
62%
534
20%
1135
August21st to endNight
64%
752
15%
1940
11%
752
65%
752
26%
1379
September1st to 10thNight
69%
720
21%
1923
18%
720
70%
720
32%
1261
September11th to 20thNight
62%
720
20%
1980
18%
720
64%
720
28%
1330
September21st to endNight
55%
720
19%
1980
15%
720
59%
720
25%
1358
October1st to 10thNight
58%
720
25%
2105
24%
720
63%
720
34%
1261
October11th to 20thNight
51%
720
30%
2160
26%
720
60%
720
34%
1249
October21st to endNight
51%
792
31%
2376
24%
792
63%
792
36%
1339
November1st to 10thNight
50%
740
28%
2221
22%
740
59%
740
34%
1281
November11th to 20thNight
43%
760
27%
2390
20%
760
53%
760
32%
1361
November21st to endNight
45%
760
27%
2470
20%
760
57%
760
30%
1447
December1st to 10thNight
35%
760
23%
2470
13%
760
47%
760
22%
1598
December11th to 20thNight
41%
759
27%
2931
19%
758
51%
758
25%
1680
December21st to endNight
35%
828
16%
4405
14%
817
47%
817
14%
2451

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
13%5%25%5%35%5%6%8%44%
74931
Night
13%6%25%5%3445%7%44%
74806
TransparencyDay
38%7%12%20%18%4
74654
Night
38%7%11%19%19%6%
74602
SeeingDay
15%8%22%25%20%10%
14190
Night
16%6%24%32%20%3
24331

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
17%5%25%5%34336%46%
1706
11th to 20thDay
16%7%35%43445%6%44%
1638
21st to endDay
16%5%36%33444449%
1782
February1st to 10thDay
16%6%26%5%245%5%6%43%
1620
11th to 20thDay
20%5%2343345%5%46%
1705
21st to endDay
18%8%26%5%25%446%40%
1543
March1st to 10thDay
15%5%2432335%6%52%
1980
11th to 20thDay
17%5%35%5%35%45%8%41%
1980
21st to endDay
16%6%36%4245%5%8%41%
2178
April1st to 10thDay
11%4144245%6%8%52%
1988
11th to 20thDay
13%5%25%42445%7%48%
2134
21st to endDay
13%424435%447%50%
2266
May1st to 10thDay
8%5%345%45%6%6%8%46%
2340
11th to 20thDay
12%6%25%5%446%7%8%41%
2301
21st to endDay
10%6%36%6%45%5%6%9%40%
2531
June1st to 10thDay
9%5%25%6%36%6%7%11%39%
2340
11th to 20thDay
8%6%25%6%46%5%7%10%42%
2340
21st to endDay
6%335%7%47%6%8%11%40%
2340
July1st to 10thDay
8%5%26%8%46%7%8%12%34%
2340
11th to 20thDay
8%5%36%6%47%7%8%12%33%
2340
21st to endDay
7%5%35%7%5%7%7%8%12%35%
2547
August1st to 10thDay
11%5%35%6%47%7%7%12%32%
2327
11th to 20thDay
12%6%26%7%5%7%6%7%11%30%
2303
21st to endDay
10%6%35%7%46%7%7%9%36%
2395
September1st to 10thDay
8%425%6%45%6%7%9%44%
2033
11th to 20thDay
12%6%25%5%45%5%6%8%43%
1980
21st to endDay
19%6%25%435%5%5%7%41%
1980
October1st to 10thDay
14%6%24423346%53%
1854
11th to 20thDay
13%5%2432334456%
1800
21st to endDay
12%5%24323345%56%
1980
November1st to 10thDay
14%425%323245%57%
1857
11th to 20thDay
13%5%2342335%6%54%
1786
21st to endDay
15%5%25%424446%50%
1710
December1st to 10thDay
17%8%35%43445%7%40%
1710
11th to 20thDay
16%42432235%6%53%
2153
21st to endDay
17%7%25%43445%6%44%
3124
January1st to 10thNight
18%6%25%5%33345%48%
2459
11th to 20thNight
15%6%35%435%46%6%45%
2367
21st to endNight
16%6%24423345%49%
2574
February1st to 10thNight
16%7%35%434446%45%
2340
11th to 20thNight
20%7%24423445%43%
2138
21st to endNight
17%7%25%5%2335%7%45%
1711
March1st to 10thNight
14%6%25%32425%7%50%
1980
11th to 20thNight
16%6%25%4335%6%8%42%
1980
21st to endNight
15%6%35%6%36%5%5%7%41%
2178
April1st to 10thNight
12%6%245%3435%8%49%
1971
11th to 20thNight
11%5%245%24447%52%
1775
21st to endNight
12%4244345%5%7%50%
1708
May1st to 10thNight
10%5%25%5%245%5%8%48%
1620
11th to 20thNight
13%6%37%6%45%6%6%8%36%
1592
21st to endNight
11%6%25%5%36%6%7%9%41%
1744
June1st to 10thNight
10%6%27%7%46%6%8%9%36%
1620
11th to 20thNight
11%5%35%6%46%6%8%11%35%
1620
21st to endNight
7%5%35%6%47%6%9%13%35%
1620
July1st to 10thNight
7%5%37%8%46%7%8%12%33%
1620
11th to 20thNight
7%5%35%6%46%8%8%13%35%
1620
21st to endNight
5%5%37%8%47%7%8%12%34%
1771
August1st to 10thNight
10%7%36%5%46%7%9%13%32%
1611
11th to 20thNight
10%7%38%7%5%5%6%7%8%34%
1598
21st to endNight
9%6%36%7%46%6%8%10%34%
1940
September1st to 10thNight
8%5%25%5%45%5%6%9%45%
1923
11th to 20thNight
12%7%26%5%35%5%5%7%43%
1980
21st to endNight
17%6%25%5%45%46%5%40%
1980
October1st to 10thNight
14%42442445%6%52%
2105
11th to 20thNight
14%6%1442335%5%54%
2160
21st to endNight
12%5%24423345%56%
2376
November1st to 10thNight
13%5%24423346%55%
2221
11th to 20thNight
13%6%24424347%51%
2390
21st to endNight
14%4245%3445%7%49%
2470
December1st to 10thNight
18%8%35%5%34445%42%
2470
11th to 20thNight
17%6%24422335%52%
3042
21st to endNight
19%5%2443445%7%43%
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
41%5%7%20%21%5%
1707
11th to 20thDay
42%5%8%17%22%5%
1638
21st to endDay
38%46%21%24%7%
1782
February1st to 10thDay
41%5%10%21%18%5%
1620
11th to 20thDay
41%48%19%23%5%
1715
21st to endDay
46%5%7%16%18%7%
1543
March1st to 10thDay
34%48%21%24%8%
1980
11th to 20thDay
41%6%11%19%17%6%
1980
21st to endDay
42%7%10%19%19%3
2178
April1st to 10thDay
31%5%11%21%26%6%
1988
11th to 20thDay
35%5%10%19%21%9%
2134
21st to endDay
34%6%11%23%22%4
2266
May1st to 10thDay
34%8%14%21%19%3
2340
11th to 20thDay
39%10%16%19%15%2
2305
21st to endDay
39%9%14%23%15%1
2531
June1st to 10thDay
37%11%14%25%12%1
2340
11th to 20thDay
36%9%18%22%14%1
2340
21st to endDay
35%12%16%21%14%2
2340
July1st to 10thDay
39%12%19%18%10%3
2275
11th to 20thDay
39%13%22%18%7%1
2271
21st to endDay
37%12%20%21%9%1
2405
August1st to 10thDay
42%11%19%20%8%1
2314
11th to 20thDay
45%11%17%16%9%1
2303
21st to endDay
40%11%18%19%9%3
2395
September1st to 10thDay
34%9%16%19%18%3
2033
11th to 20thDay
38%8%12%18%21%4
1980
21st to endDay
43%7%8%20%17%5%
1980
October1st to 10thDay
33%49%22%27%5%
1854
11th to 20thDay
31%49%25%23%8%
1800
21st to endDay
31%47%21%28%9%
1980
November1st to 10thDay
31%47%19%29%9%
1857
11th to 20thDay
31%5%8%21%27%8%
1786
21st to endDay
36%49%20%23%8%
1710
December1st to 10thDay
43%6%9%20%18%4
1710
11th to 20thDay
34%37%21%28%8%
2150
21st to endDay
41%6%8%23%20%3
3124
January1st to 10thNight
40%49%17%24%7%
2459
11th to 20thNight
40%5%9%18%22%6%
2367
21st to endNight
39%35%20%26%7%
2574
February1st to 10thNight
41%410%19%20%7%
2340
11th to 20thNight
44%46%17%23%6%
2139
21st to endNight
41%5%10%19%20%7%
1711
March1st to 10thNight
36%48%18%23%10%
1980
11th to 20thNight
40%6%11%16%20%7%
1980
21st to endNight
42%7%10%18%18%4
2178
April1st to 10thNight
34%5%9%19%25%7%
1971
11th to 20thNight
32%6%11%20%22%9%
1775
21st to endNight
33%7%11%24%21%5%
1708
May1st to 10thNight
33%8%14%23%18%3
1620
11th to 20thNight
44%9%12%19%15%1
1593
21st to endNight
36%11%15%24%12%2
1745
June1st to 10thNight
41%11%14%21%11%2
1620
11th to 20thNight
39%10%18%20%11%2
1620
21st to endNight
37%13%18%18%11%3
1620
July1st to 10thNight
40%13%20%15%8%3
1575
11th to 20thNight
35%14%23%18%7%2
1566
21st to endNight
38%14%19%19%9%1
1672
August1st to 10thNight
40%13%21%19%6%1
1600
11th to 20thNight
44%12%18%15%9%2
1598
21st to endNight
40%13%17%22%7%2
1940
September1st to 10thNight
34%10%14%20%16%6%
1923
11th to 20thNight
39%9%14%17%20%2
1980
21st to endNight
44%7%11%16%17%5%
1980
October1st to 10thNight
33%5%10%19%26%6%
2105
11th to 20thNight
33%5%8%23%22%10%
2160
21st to endNight
31%47%20%27%11%
2376
November1st to 10thNight
33%37%17%27%12%
2221
11th to 20thNight
34%47%17%25%12%
2390
21st to endNight
35%5%6%20%27%8%
2470
December1st to 10thNight
45%49%17%19%6%
2470
11th to 20thNight
38%38%17%25%10%
3044
21st to endNight
40%5%9%20%23%3
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
22%14%40%20%3
270
11th to 20thDay
22%17%34%20%7%1
246
21st to endDay
19%22%36%19%31
264
February1st to 10thDay
23%18%36%16%7%
240
11th to 20thDay
33%13%42%11%2
240
21st to endDay
23%20%33%18%4
261
March1st to 10thDay
20%13%35%24%8%
420
11th to 20thDay
20%13%40%21%6%1
420
21st to endDay
19%15%33%24%8%1
462
April1st to 10thDay
17%15%30%23%13%2
420
11th to 20thDay
13%14%30%24%15%4
412
21st to endDay
16%10%26%28%16%5%
420
May1st to 10thDay
10%12%34%24%16%4
423
11th to 20thDay
15%5%17%29%23%10%
447
21st to endDay
13%413%26%27%16%
485
June1st to 10thDay
11%314%31%30%12%
450
11th to 20thDay
12%5%15%25%28%17%
450
21st to endDay
8%212%33%30%15%
450
July1st to 10thDay
7%29%20%37%24%
445
11th to 20thDay
9%17%25%35%22%
444
21st to endDay
7%28%25%41%18%
488
August1st to 10thDay
14%310%26%27%21%
446
11th to 20thDay
13%47%25%30%23%
439
21st to endDay
13%210%25%28%22%
495
September1st to 10thDay
11%29%26%32%20%
450
11th to 20thDay
15%311%23%31%17%
450
21st to endDay
20%317%27%25%7%
450
October1st to 10thDay
17%419%23%26%11%
450
11th to 20thDay
13%6%23%26%24%8%
450
21st to endDay
15%5%25%29%20%6%
495
November1st to 10thDay
18%6%23%30%18%5%
455
11th to 20thDay
17%11%31%29%10%3
346
21st to endDay
12%12%34%28%12%3
270
December1st to 10thDay
23%13%37%19%7%
270
11th to 20thDay
20%10%33%26%9%3
270
21st to endDay
23%13%35%19%7%3
297
January1st to 10thNight
21%10%35%27%7%
760
11th to 20thNight
20%10%33%31%6%
729
21st to endNight
19%8%39%30%4
792
February1st to 10thNight
20%8%38%30%4
720
11th to 20thNight
25%10%40%24%2
703
21st to endNight
19%13%37%26%4
592
March1st to 10thNight
17%9%37%33%5%
720
11th to 20thNight
18%11%36%25%9%1
720
21st to endNight
18%10%33%31%7%
792
April1st to 10thNight
14%13%33%31%10%
720
11th to 20thNight
14%11%28%31%15%1
711
21st to endNight
14%6%28%37%16%
628
May1st to 10thNight
12%7%29%37%15%
540
11th to 20thNight
14%5%22%36%23%1
531
21st to endNight
14%211%37%34%2
584
June1st to 10thNight
11%314%41%26%5%
540
11th to 20thNight
12%314%30%33%7%
540
21st to endNight
8%212%38%35%5%
540
July1st to 10thNight
8%28%34%42%7%
525
11th to 20thNight
9%26%32%44%8%
522
21st to endNight
6%210%32%43%7%
591
August1st to 10thNight
11%27%31%41%8%
537
11th to 20thNight
11%48%27%43%7%
534
21st to endNight
10%29%27%44%8%
752
September1st to 10thNight
10%38%29%44%7%
720
11th to 20thNight
15%310%28%38%6%
720
21st to endNight
19%314%33%27%3
720
October1st to 10thNight
16%416%29%28%7%
720
11th to 20thNight
16%5%22%32%22%3
720
21st to endNight
14%6%24%32%20%3
792
November1st to 10thNight
16%5%24%33%19%3
740
11th to 20thNight
15%8%29%35%12%1
760
21st to endNight
15%7%27%37%14%1
760
December1st to 10thNight
19%10%30%34%7%
760
11th to 20thNight
20%6%27%36%11%
760
21st to endNight
24%10%25%31%10%
836
Page generated at 2024-01-10 01:24:59. Version ac07

Copyright 2024 Attilla Danko


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