Indian Foothills Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indian Foothills Park clear sky chart from 2005-11-06 to 2024-03-06.

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%
24703
20%
80374
13%
24594
49%
24594
26%
50751

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
26%
945
15%
4180
7%
926
37%
926
15%
2849
January11th to 20thNight
23%
949
17%
4033
7%
930
31%
930
14%
2860
January21st to endNight
25%
1036
12%
4482
6%
1023
33%
1023
13%
3260
February1st to 10thNight
23%
950
15%
2470
5%
950
29%
950
22%
1766
February11th to 20thNight
26%
929
18%
2404
5%
925
34%
925
25%
1629
February21st to endNight
21%
618
21%
1874
6%
618
33%
618
24%
1194
March1st to 10thNight
27%
557
23%
2041
10%
557
42%
557
23%
1209
March11th to 20thNight
32%
540
18%
1980
12%
540
41%
540
18%
1300
March21st to endNight
23%
594
11%
2178
6%
594
30%
594
13%
1557
April1st to 10thNight
33%
540
22%
1810
14%
540
47%
540
27%
1063
April11th to 20thNight
35%
533
22%
1775
17%
533
47%
533
25%
1081
April21st to endNight
32%
540
19%
1778
12%
540
46%
540
23%
1144
May1st to 10thNight
37%
540
17%
1620
12%
540
46%
540
24%
1067
May11th to 20thNight
45%
531
18%
1555
15%
531
51%
531
27%
1005
May21st to endNight
48%
584
20%
1552
12%
582
55%
582
29%
1036
June1st to 10thNight
66%
540
22%
1440
15%
540
70%
540
44%
831
June11th to 20thNight
61%
540
24%
1440
15%
540
65%
540
40%
856
June21st to endNight
63%
540
25%
1440
15%
540
67%
540
49%
788
July1st to 10thNight
72%
525
19%
1400
16%
525
73%
525
41%
828
July11th to 20thNight
73%
522
23%
1547
21%
522
75%
522
46%
809
July21st to endNight
71%
591
23%
1673
23%
558
74%
558
40%
919
August1st to 10thNight
72%
537
21%
1601
23%
534
74%
534
39%
886
August11th to 20thNight
72%
534
28%
1622
32%
534
75%
534
40%
888
August21st to endNight
77%
594
27%
1980
33%
594
78%
594
44%
997
September1st to 10thNight
65%
540
26%
1800
27%
540
69%
540
38%
959
September11th to 20thNight
64%
540
31%
1837
30%
540
69%
540
36%
976
September21st to endNight
60%
602
28%
2042
24%
602
67%
602
37%
1074
October1st to 10thNight
52%
720
26%
2160
19%
720
56%
720
39%
1191
October11th to 20thNight
36%
720
28%
2160
16%
720
46%
720
32%
1278
October21st to endNight
32%
792
24%
2376
12%
792
43%
792
28%
1471
November1st to 10thNight
42%
740
29%
2246
17%
740
54%
740
36%
1241
November11th to 20thNight
33%
850
26%
2560
13%
850
46%
850
31%
1513
November21st to endNight
31%
950
22%
2660
9%
950
41%
950
28%
1737
December1st to 10thNight
29%
950
20%
2660
7%
950
39%
950
26%
1750
December11th to 20thNight
31%
949
19%
3154
9%
948
38%
948
22%
2018
December21st to endNight
22%
1041
11%
4844
6%
1026
34%
1026
10%
3721

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%8%36%5%3445%7%42%
78645
Night
13%7%36%5%3445%6%45%
80924
TransparencyDay
41%6%12%24%14%2
78362
Night
40%5%11%24%16%3
80728
SeeingDay
14%9%27%27%18%5%
14669
Night
15%9%31%32%13%1
24723

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
14%11%5%9%6%346%5%6%33%
2723
11th to 20thDay
11%12%49%6%49%33435%
2850
21st to endDay
17%16%5%9%5%33445%30%
3135
February1st to 10thDay
17%9%5%7%7%34446%34%
1710
11th to 20thDay
14%9%37%6%33446%41%
1664
21st to endDay
13%10%46%5%245%6%5%40%
1593
March1st to 10thDay
13%10%46%5%34346%40%
2035
11th to 20thDay
20%10%5%6%5%3435%6%34%
1980
21st to endDay
22%12%46%6%35%346%28%
2178
April1st to 10thDay
15%6%36%43445%7%43%
2150
11th to 20thDay
16%10%35%5%33447%40%
2134
21st to endDay
21%6%36%6%35%45%6%34%
2178
May1st to 10thDay
17%8%46%6%346%6%7%34%
2340
11th to 20thDay
17%6%36%6%3446%6%39%
2337
21st to endDay
13%7%37%6%46%6%6%7%36%
2725
June1st to 10thDay
7%425%5%346%6%10%47%
2520
11th to 20thDay
8%426%5%35%5%6%9%47%
2520
21st to endDay
7%425%5%35%5%7%9%49%
2520
July1st to 10thDay
8%5%25%425%6%8%11%45%
2520
11th to 20thDay
5%4235%35%5%8%8%51%
2356
21st to endDay
8%6%25%5%35%47%9%46%
2546
August1st to 10thDay
7%5%245%36%6%6%10%45%
2328
11th to 20thDay
8%5%25%5%35%5%6%10%47%
2279
21st to endDay
8%4234345%5%8%53%
2376
September1st to 10thDay
12%425%42445%7%52%
2160
11th to 20thDay
10%5%1443345%8%53%
2120
21st to endDay
8%5%25%5%24447%55%
1900
October1st to 10thDay
13%4345%2445%5%52%
1800
11th to 20thDay
15%7%25%422435%52%
1800
21st to endDay
17%8%45%423345%46%
1980
November1st to 10thDay
11%6%2433335%6%54%
1830
11th to 20thDay
15%6%25%42335%6%48%
1617
21st to endDay
17%9%37%433245%44%
1520
December1st to 10thDay
10%10%5%7%5%34447%43%
1520
11th to 20thDay
12%10%47%5%34445%42%
1918
21st to endDay
17%15%7%10%6%45%445%25%
2783
January1st to 10thNight
10%10%412%7%34445%36%
4230
11th to 20thNight
13%10%5%8%6%47%6%5%5%32%
4120
21st to endNight
18%14%6%9%5%3344432%
4532
February1st to 10thNight
14%10%47%6%45%45%6%36%
2470
11th to 20thNight
14%8%46%5%245%46%42%
2403
21st to endNight
14%8%46%42345%6%44%
1874
March1st to 10thNight
14%9%34324345%48%
2041
11th to 20thNight
18%7%36%6%345%46%37%
1980
21st to endNight
22%12%46%5%35%446%29%
2178
April1st to 10thNight
11%7%345%2345%6%49%
1810
11th to 20thNight
14%6%26%5%3435%6%46%
1775
21st to endNight
16%6%37%42345%7%41%
1778
May1st to 10thNight
15%6%25%5%3446%8%41%
1620
11th to 20thNight
14%7%35%5%2445%8%44%
1554
21st to endNight
12%5%26%5%46%46%9%42%
1551
June1st to 10thNight
6%3234345%6%9%55%
1440
11th to 20thNight
5%325%6%35%47%10%50%
1440
21st to endNight
431343446%9%59%
1440
July1st to 10thNight
8%324435%5%7%10%50%
1440
11th to 20thNight
42245%245%6%9%58%
1599
21st to endNight
6%3244345%8%9%51%
1772
August1st to 10thNight
5%3235%35%5%7%10%51%
1611
11th to 20thNight
7%42442445%8%56%
1622
21st to endNight
6%313325%5%5%8%60%
1980
September1st to 10thNight
10%423323446%57%
1800
11th to 20thNight
10%41443346%6%54%
1837
21st to endNight
7%324434447%57%
2042
October1st to 10thNight
10%41342335%6%56%
2160
11th to 20thNight
15%5%25%433335%54%
2160
21st to endNight
17%7%2432334450%
2376
November1st to 10thNight
10%5%24323347%58%
2246
11th to 20thNight
12%6%34424446%52%
2560
21st to endNight
18%8%24433335%47%
2660
December1st to 10thNight
13%8%45%434347%43%
2660
11th to 20thNight
14%8%47%5%3435%6%42%
3279
21st to endNight
20%16%6%9%6%3333427%
4884

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
50%5%12%23%9%1
2724
11th to 20thDay
54%312%22%9%
2850
21st to endDay
57%410%16%10%1
3135
February1st to 10thDay
51%5%12%21%11%1
1710
11th to 20thDay
46%5%11%21%14%3
1673
21st to endDay
45%5%10%22%15%3
1593
March1st to 10thDay
46%410%24%13%3
2035
11th to 20thDay
52%6%9%22%10%2
1980
21st to endDay
58%5%12%17%7%1
2178
April1st to 10thDay
42%5%12%25%15%1
2150
11th to 20thDay
45%5%12%23%13%2
2134
21st to endDay
50%6%11%21%11%
2178
May1st to 10thDay
48%8%12%21%11%1
2340
11th to 20thDay
45%7%12%23%12%
2341
21st to endDay
45%8%13%21%11%2
2725
June1st to 10thDay
30%8%16%31%14%1
2520
11th to 20thDay
33%8%15%26%16%2
2520
21st to endDay
29%7%17%28%14%4
2520
July1st to 10thDay
31%9%16%26%15%4
2451
11th to 20thDay
27%9%16%27%17%3
2286
21st to endDay
32%7%14%32%14%1
2405
August1st to 10thDay
32%10%19%25%13%1
2314
11th to 20thDay
34%7%13%30%15%1
2279
21st to endDay
27%7%13%26%20%6%
2376
September1st to 10thDay
31%6%13%26%18%6%
2160
11th to 20thDay
29%5%11%27%25%4
2120
21st to endDay
30%6%10%28%23%3
1900
October1st to 10thDay
34%411%26%22%3
1800
11th to 20thDay
36%38%27%22%4
1800
21st to endDay
42%310%22%19%4
1980
November1st to 10thDay
33%414%25%20%5%
1830
11th to 20thDay
37%410%25%20%3
1617
21st to endDay
44%310%28%16%
1520
December1st to 10thDay
42%6%12%28%12%1
1520
11th to 20thDay
46%415%25%9%2
1915
21st to endDay
62%5%10%14%8%1
2783
January1st to 10thNight
51%5%11%22%11%1
4230
11th to 20thNight
53%5%11%19%10%1
4120
21st to endNight
57%411%19%9%1
4532
February1st to 10thNight
49%5%11%20%13%3
2470
11th to 20thNight
44%411%21%17%2
2404
21st to endNight
41%5%10%20%19%4
1874
March1st to 10thNight
40%410%25%18%3
2041
11th to 20thNight
47%5%10%21%13%3
1980
21st to endNight
55%5%12%18%8%1
2178
April1st to 10thNight
35%6%10%27%19%4
1810
11th to 20thNight
39%5%9%27%16%4
1775
21st to endNight
43%6%10%23%17%1
1778
May1st to 10thNight
41%8%12%23%14%2
1620
11th to 20thNight
39%8%13%22%16%1
1555
21st to endNight
38%8%14%23%14%2
1552
June1st to 10thNight
24%8%16%31%18%3
1440
11th to 20thNight
27%8%13%27%21%5%
1440
21st to endNight
22%6%17%31%19%6%
1440
July1st to 10thNight
28%7%14%30%17%4
1400
11th to 20thNight
22%6%15%32%22%3
1547
21st to endNight
26%7%14%36%16%2
1673
August1st to 10thNight
25%8%19%30%16%2
1601
11th to 20thNight
27%6%11%32%23%1
1622
21st to endNight
22%6%13%27%25%7%
1980
September1st to 10thNight
28%5%12%24%25%6%
1800
11th to 20thNight
29%5%10%27%24%5%
1837
21st to endNight
27%5%10%28%26%4
2042
October1st to 10thNight
28%410%26%26%6%
2160
11th to 20thNight
35%46%27%21%7%
2160
21st to endNight
38%5%9%22%23%4
2376
November1st to 10thNight
29%5%13%26%22%6%
2246
11th to 20thNight
35%48%26%24%4
2560
21st to endNight
42%49%26%17%2
2660
December1st to 10thNight
42%5%12%26%14%1
2660
11th to 20thNight
43%412%28%13%1
3281
21st to endNight
62%5%9%15%8%1
4884

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
19%16%37%23%6%
270
11th to 20thDay
31%15%36%16%1
270
21st to endDay
16%16%43%20%5%
297
February1st to 10thDay
24%15%41%17%3
270
11th to 20thDay
19%19%39%16%7%
270
21st to endDay
18%21%41%16%3
225
March1st to 10thDay
15%17%50%15%3
255
11th to 20thDay
29%10%33%25%4
240
21st to endDay
35%20%29%13%3
264
April1st to 10thDay
18%16%33%25%7%1
410
11th to 20thDay
20%14%34%25%6%1
412
21st to endDay
22%12%32%23%9%1
438
May1st to 10thDay
18%12%33%26%10%
603
11th to 20thDay
19%10%27%28%13%3
625
21st to endDay
15%7%27%28%18%5%
679
June1st to 10thDay
7%318%33%28%10%
630
11th to 20thDay
10%222%36%25%5%
630
21st to endDay
6%6%29%37%18%4
630
July1st to 10thDay
9%414%24%35%14%
621
11th to 20thDay
6%219%33%32%9%
618
21st to endDay
9%315%32%33%9%
684
August1st to 10thDay
7%215%40%30%7%
626
11th to 20thDay
8%317%36%28%9%
593
21st to endDay
10%212%28%36%12%
495
September1st to 10thDay
12%316%33%27%9%
450
11th to 20thDay
7%116%35%30%11%
410
21st to endDay
7%7%25%32%21%7%
270
October1st to 10thDay
16%7%27%27%15%7%
270
11th to 20thDay
13%17%40%21%9%
270
21st to endDay
28%16%32%18%6%
297
November1st to 10thDay
16%9%37%24%11%4
270
11th to 20thDay
16%16%32%23%10%2
270
21st to endDay
23%16%27%27%6%
270
December1st to 10thDay
11%17%36%25%9%2
270
11th to 20thDay
17%17%36%24%6%
270
21st to endDay
21%22%39%16%1
297
January1st to 10thNight
15%13%40%25%7%
950
11th to 20thNight
17%14%40%23%5%1
950
21st to endNight
16%13%39%28%4
1045
February1st to 10thNight
18%13%40%26%3
950
11th to 20thNight
17%14%38%28%3
929
21st to endNight
19%14%43%20%3
618
March1st to 10thNight
18%13%39%26%3
557
11th to 20thNight
20%10%34%30%5%1
540
21st to endNight
27%11%35%23%4
594
April1st to 10thNight
15%11%38%31%5%
540
11th to 20thNight
17%12%32%30%9%
533
21st to endNight
19%8%38%28%8%
540
May1st to 10thNight
16%7%32%36%9%1
540
11th to 20thNight
17%427%35%15%1
531
21st to endNight
14%5%26%33%21%2
584
June1st to 10thNight
7%217%47%24%3
540
11th to 20thNight
6%223%45%23%2
540
21st to endNight
3326%46%21%1
540
July1st to 10thNight
9%210%41%34%4
525
11th to 20thNight
5%114%43%35%2
522
21st to endNight
7%212%43%34%2
591
August1st to 10thNight
4313%46%32%2
537
11th to 20thNight
6%313%41%35%3
534
21st to endNight
7%111%38%40%3
594
September1st to 10thNight
12%215%39%28%4
540
11th to 20thNight
12%117%37%27%6%
540
21st to endNight
8%422%38%24%3
602
October1st to 10thNight
12%5%27%32%21%3
720
11th to 20thNight
17%9%35%32%8%
720
21st to endNight
21%11%33%27%8%
792
November1st to 10thNight
13%9%33%35%10%
740
11th to 20thNight
14%12%37%29%8%
850
21st to endNight
20%9%37%29%5%
950
December1st to 10thNight
17%10%40%26%6%1
950
11th to 20thNight
20%10%33%31%5%
950
21st to endNight
21%14%37%25%3
1045
Page generated at 2024-03-03 05:28:59. Version ac07

Copyright © 2024 Attilla Danko.


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