Delhi (ON)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Delhi (ON) clear sky chart from 2005-11-05 to 2017-09-22.

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
36%
14950
14%
46798
10%
14912
42%
14912
19%
32574

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 15thNight
16%
716
10%
2398
5%
716
22%
716
8%
1896
January16th to endNight
16%
768
9%
2496
3%
768
23%
768
9%
1976
February1st to 15thNight
18%
703
7%
2287
2%
701
24%
701
9%
1821
February16th to endNight
22%
631
11%
1978
4%
631
30%
631
13%
1500
March1st to 15thNight
27%
720
14%
1992
7%
720
33%
720
16%
1509
March16th to endNight
34%
768
19%
2112
10%
768
40%
768
22%
1465
April1st to 15thNight
28%
712
15%
1845
7%
712
34%
712
22%
1337
April16th to endNight
42%
540
21%
1620
10%
540
50%
540
26%
1042
May1st to 15thNight
42%
540
16%
1620
10%
540
48%
540
23%
1088
May16th to endNight
48%
396
17%
1519
17%
396
56%
396
24%
885
June1st to 15thNight
48%
360
13%
1440
14%
360
55%
360
22%
855
June16th to endNight
53%
360
15%
1317
17%
360
59%
360
25%
789
July1st to 15thNight
64%
353
17%
1322
22%
353
68%
353
33%
680
July16th to endNight
62%
564
15%
1595
14%
531
65%
531
33%
940
August1st to 15thNight
69%
539
18%
1609
14%
536
72%
536
34%
961
August16th to endNight
63%
603
23%
1749
15%
603
67%
603
36%
1034
September1st to 15thNight
56%
720
21%
1860
13%
720
59%
720
33%
1195
September16th to endNight
57%
685
22%
1892
16%
685
61%
685
32%
1186
October1st to 15thNight
44%
660
19%
1974
17%
660
48%
660
25%
1287
October16th to endNight
25%
704
14%
2112
7%
704
34%
704
16%
1538
November1st to 15thNight
36%
700
20%
2333
16%
700
42%
700
21%
1510
November16th to endNight
22%
720
11%
2520
6%
720
29%
720
12%
1860
December1st to 15thNight
15%
720
7%
2520
3%
720
19%
720
8%
1993
December16th to endNight
15%
768
7%
2688
2%
768
20%
768
7%
2227

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
14%9%47%6%35%45%7%31%
48063
Night
15%8%46%5%3445%7%34%
46982
Cloud CoverDay
15%8%36%6%35%45%7%32%
48073
Night
15%8%46%5%3445%7%34%
46986
TransparencyDay
49%7%13%18%9%1
47765
Night
48%7%12%20%10%1
46798
SeeingDay
17%7%26%25%16%7%
5505
Night
19%8%28%28%13%1
14956

By Month

Percentage Cloud Cover NE (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 15thDay
18%14%5%9%7%36%447%17%
1537
16th to endDay
14%16%7%12%8%35%345%15%
1728
February1st to 15thDay
15%17%6%9%7%45%445%18%
1575
16th to endDay
17%11%7%11%7%25%446%20%
1494
March1st to 15thDay
17%14%5%9%7%35%35%5%24%
1957
16th to endDay
16%10%5%7%6%34346%31%
2112
April1st to 15thDay
18%11%47%6%2345%6%28%
2113
16th to endDay
18%8%35%424447%37%
2340
May1st to 15thDay
16%6%37%5%35%45%7%34%
2331
16th to endDay
12%5%25%5%445%5%8%39%
2593
June1st to 15thDay
12%6%34435%5%5%8%38%
2520
16th to endDay
12%5%25%425%6%6%10%37%
2634
July1st to 15thDay
9%425%5%35%5%6%10%41%
2548
16th to endDay
9%5%26%5%36%6%7%10%36%
2465
August1st to 15thDay
8%5%25%6%46%6%7%9%37%
2340
16th to endDay
11%5%25%5%36%46%8%40%
2440
September1st to 15thDay
13%5%26%5%35%5%6%8%37%
2099
16th to endDay
14%5%25%5%3446%6%40%
1881
October1st to 15thDay
16%7%36%5%35%45%7%34%
1656
16th to endDay
22%11%47%5%3435%6%24%
1760
November1st to 15thDay
13%8%36%6%35%5%5%7%35%
1524
16th to endDay
21%12%37%5%25%5%5%7%22%
1440
December1st to 15thDay
17%17%6%9%7%3345%5%20%
1440
16th to endDay
20%17%6%9%8%34445%13%
1536
January1st to 15thNight
20%13%6%9%6%34445%21%
2398
16th to endNight
14%14%7%10%7%345%5%5%20%
2496
February1st to 15thNight
15%14%6%10%7%45%5%45%22%
2285
16th to endNight
17%10%5%7%7%35%45%6%25%
1978
March1st to 15thNight
18%8%47%6%25%5%5%7%28%
1980
16th to endNight
15%9%444335%37%37%
2112
April1st to 15thNight
20%8%25%426%346%33%
1845
16th to endNight
11%5%26%5%245%6%7%41%
1620
May1st to 15thNight
16%5%35%6%345%6%7%35%
1620
16th to endNight
10%426%5%245%5%7%46%
1517
June1st to 15thNight
10%5%35%5%345%6%9%40%
1440
16th to endNight
9%5%245%35%5%6%9%43%
1317
July1st to 15thNight
432442436%8%55%
1403
16th to endNight
7%3145%245%7%9%47%
1703
August1st to 15thNight
5%3145%45%5%6%10%48%
1620
16th to endNight
8%414324448%52%
1749
September1st to 15thNight
11%5%35%42346%6%46%
1860
16th to endNight
11%4145%3346%7%46%
1892
October1st to 15thNight
15%6%25%5%23447%43%
1974
16th to endNight
21%8%26%5%3445%7%30%
2112
November1st to 15thNight
14%7%35%43446%7%38%
2333
16th to endNight
20%10%46%5%25%448%26%
2520
December1st to 15thNight
20%15%6%7%5%23447%21%
2520
16th to endNight
21%12%6%9%7%44446%17%
2688

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 15thDay
19%14%5%9%7%45%446%18%
1537
16th to endDay
14%17%7%11%8%45%445%16%
1728
February1st to 15thDay
16%17%6%10%7%45%445%18%
1575
16th to endDay
17%11%7%10%7%3445%6%21%
1494
March1st to 15thDay
18%13%5%8%7%3435%5%24%
1968
16th to endDay
17%10%5%6%6%34345%31%
2111
April1st to 15thDay
19%10%47%6%2335%6%28%
2113
16th to endDay
18%8%35%424347%37%
2340
May1st to 15thDay
16%6%26%6%35%45%7%34%
2331
16th to endDay
13%5%245%35%5%5%8%40%
2593
June1st to 15thDay
13%5%25%436%45%8%39%
2520
16th to endDay
13%4244346%7%10%38%
2634
July1st to 15thDay
9%5%245%45%5%6%9%42%
2548
16th to endDay
9%5%25%5%35%6%7%9%37%
2465
August1st to 15thDay
8%5%25%6%36%6%7%9%38%
2340
16th to endDay
11%5%26%4346%6%7%41%
2440
September1st to 15thDay
14%425%5%35%5%6%8%38%
2099
16th to endDay
14%5%25%5%345%5%6%40%
1881
October1st to 15thDay
16%7%36%5%35%45%7%34%
1656
16th to endDay
23%10%37%6%3445%6%24%
1760
November1st to 15thDay
14%7%26%435%45%8%36%
1524
16th to endDay
21%12%46%5%245%5%7%23%
1440
December1st to 15thDay
17%16%6%9%7%3345%5%21%
1440
16th to endDay
20%18%7%8%7%45%445%14%
1536
January1st to 15thNight
21%13%6%9%5%34445%22%
2398
16th to endNight
14%15%7%10%7%25%5%5%5%21%
2496
February1st to 15thNight
15%14%5%10%6%35%45%5%22%
2278
16th to endNight
17%11%5%7%8%35%45%6%25%
1978
March1st to 15thNight
19%7%5%7%5%345%5%6%28%
1992
16th to endNight
15%9%35%434436%38%
2112
April1st to 15thNight
20%8%34435%346%33%
1845
16th to endNight
11%5%25%5%345%6%7%41%
1620
May1st to 15thNight
16%5%35%5%335%5%8%36%
1619
16th to endNight
10%435%4235%5%7%46%
1517
June1st to 15thNight
10%5%25%5%245%6%9%41%
1440
16th to endNight
10%5%145%35%5%6%10%41%
1317
July1st to 15thNight
5%3245%2436%7%54%
1403
16th to endNight
7%315%425%47%9%47%
1703
August1st to 15thNight
5%3145%35%46%10%48%
1620
16th to endNight
9%314333448%52%
1749
September1st to 15thNight
12%5%25%42345%6%47%
1860
16th to endNight
11%425%5%3346%6%47%
1892
October1st to 15thNight
15%5%345%23446%43%
1974
16th to endNight
21%8%25%5%335%5%7%30%
2112
November1st to 15thNight
14%7%35%425%45%7%39%
2333
16th to endNight
20%10%46%5%25%448%26%
2520
December1st to 15thNight
21%15%6%7%5%23437%21%
2520
16th to endNight
22%12%6%9%6%35%446%18%
2688

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 15thDay
65%6%10%11%4
1538
16th to endDay
69%6%10%9%3
1728
February1st to 15thDay
68%5%9%12%3
1577
16th to endDay
63%7%11%12%4
1494
March1st to 15thDay
61%5%11%15%4
1968
16th to endDay
53%5%11%19%8%1
2112
April1st to 15thDay
55%5%11%17%9%
2113
16th to endDay
46%5%11%20%14%2
2340
May1st to 15thDay
48%6%12%20%10%
2331
16th to endDay
40%7%14%21%13%1
2597
June1st to 15thDay
40%8%14%23%11%1
2520
16th to endDay
38%9%15%22%13%
2634
July1st to 15thDay
36%7%13%24%16%2
2400
16th to endDay
39%10%16%20%10%2
2310
August1st to 15thDay
38%9%16%22%11%1
2327
16th to endDay
38%8%14%24%11%1
2440
September1st to 15thDay
41%8%15%23%11%
2099
16th to endDay
42%6%15%23%11%
1881
October1st to 15thDay
48%7%14%16%11%1
1656
16th to endDay
59%6%14%14%4
1760
November1st to 15thDay
46%7%15%20%8%1
1524
16th to endDay
58%8%13%15%4
1440
December1st to 15thDay
64%8%15%9%2
1440
16th to endDay
72%7%8%9%1
1536
January1st to 15thNight
64%6%9%11%7%
2398
16th to endNight
62%7%10%13%4
2496
February1st to 15thNight
64%6%11%12%5%
2287
16th to endNight
58%6%12%16%5%
1978
March1st to 15thNight
54%8%11%19%6%1
1992
16th to endNight
47%5%10%21%13%2
2112
April1st to 15thNight
51%411%19%13%
1845
16th to endNight
39%7%9%21%18%3
1620
May1st to 15thNight
44%6%10%24%11%2
1620
16th to endNight
35%8%12%24%15%3
1519
June1st to 15thNight
38%7%11%25%14%1
1440
16th to endNight
35%8%13%22%17%1
1317
July1st to 15thNight
28%5%11%27%23%3
1322
16th to endNight
29%9%15%25%17%3
1595
August1st to 15thNight
29%9%14%30%13%1
1609
16th to endNight
30%7%13%29%16%2
1749
September1st to 15thNight
36%5%13%26%15%2
1860
16th to endNight
35%6%12%28%15%1
1892
October1st to 15thNight
41%5%12%23%15%
1974
16th to endNight
52%6%13%19%7%
2112
November1st to 15thNight
42%7%13%21%13%1
2333
16th to endNight
56%6%14%15%5%
2520
December1st to 15thNight
62%8%14%11%3
2520
16th to endNight
67%8%11%9%2
2688

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 15thDay
22%18%44%5%9%1
77
16th to endDay
33%20%33%11%1
96
February1st to 15thDay
22%14%53%10%
90
16th to endDay
19%16%43%19%1
81
March1st to 15thDay
24%12%31%22%8%
258
16th to endDay
24%9%32%23%8%1
288
April1st to 15thDay
22%11%29%23%10%1
270
16th to endDay
17%7%31%22%12%7%
270
May1st to 15thDay
21%7%26%23%13%7%
288
16th to endDay
14%6%25%31%13%8%
331
June1st to 15thDay
16%323%37%14%3
315
16th to endDay
14%428%31%16%4
429
July1st to 15thDay
13%221%28%24%9%
350
16th to endDay
9%122%29%26%10%
326
August1st to 15thDay
10%17%29%25%17%
313
16th to endDay
12%315%23%23%20%
332
September1st to 15thDay
12%217%22%30%14%
315
16th to endDay
17%316%23%22%16%
278
October1st to 15thDay
16%7%25%26%18%6%
255
16th to endDay
26%10%31%24%6%
272
November1st to 15thDay
12%16%31%22%13%3
87
16th to endDay
26%18%30%15%8%1
60
December1st to 15thDay
28%31%28%6%5%
60
16th to endDay
29%29%28%10%1
64
January1st to 15thNight
26%17%31%19%4
720
16th to endNight
21%15%36%22%4
768
February1st to 15thNight
24%15%34%23%3
704
16th to endNight
22%12%32%27%4
631
March1st to 15thNight
22%10%33%26%7%
720
16th to endNight
19%7%32%27%11%
768
April1st to 15thNight
24%10%31%26%5%
712
16th to endNight
15%5%31%33%12%1
540
May1st to 15thNight
18%426%33%15%1
540
16th to endNight
12%326%34%20%1
397
June1st to 15thNight
13%327%38%17%
360
16th to endNight
10%227%42%17%
360
July1st to 15thNight
5%120%43%24%2
353
16th to endNight
8%118%45%22%3
564
August1st to 15thNight
7%115%42%30%3
539
16th to endNight
10%117%33%32%3
603
September1st to 15thNight
14%316%33%27%5%
720
16th to endNight
13%317%30%28%7%
685
October1st to 15thNight
19%7%22%28%19%2
660
16th to endNight
25%10%34%23%5%
704
November1st to 15thNight
18%9%31%27%11%2
700
16th to endNight
25%15%30%19%8%
720
December1st to 15thNight
29%15%34%16%3
720
16th to endNight
27%13%35%19%3
768
Page generated at 2017-09-23 06:43:36. Version ac04

Copyright 2017 A. Danko


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