Indian Pass Penninsula
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Indian Pass Penninsula clear sky chart from 2005-11-05 to 2017-12-02.

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
62%
15772
23%
47886
19%
15732
66%
15732
33%
28350

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
40%
718
22%
2306
13%
716
52%
716
26%
1405
January16th to endNight
42%
768
25%
2304
17%
768
50%
768
25%
1497
February1st to 15thNight
43%
701
27%
2106
16%
699
53%
699
31%
1272
February16th to endNight
46%
631
24%
1893
14%
631
54%
631
32%
1137
March1st to 15thNight
53%
720
26%
2085
16%
720
60%
720
36%
1217
March16th to endNight
58%
768
27%
2112
18%
768
62%
768
40%
1219
April1st to 15thNight
59%
620
26%
1878
22%
620
64%
620
36%
1074
April16th to endNight
68%
540
31%
1800
28%
540
74%
540
41%
905
May1st to 15thNight
72%
539
27%
1643
25%
539
75%
539
43%
863
May16th to endNight
78%
561
27%
1682
24%
561
79%
561
45%
892
June1st to 15thNight
77%
540
18%
1620
17%
540
77%
540
36%
950
June16th to endNight
79%
540
18%
1620
17%
540
79%
540
36%
933
July1st to 15thNight
78%
510
11%
1530
12%
510
78%
510
29%
960
July16th to endNight
77%
564
12%
1652
13%
531
77%
531
29%
1038
August1st to 15thNight
77%
539
9%
1788
11%
536
77%
536
24%
1142
August16th to endNight
73%
573
15%
1910
17%
573
73%
573
25%
1199
September1st to 15thNight
72%
699
13%
1959
12%
699
72%
699
27%
1316
September16th to endNight
70%
717
23%
1980
22%
717
71%
717
31%
1271
October1st to 15thNight
68%
720
29%
1980
24%
720
72%
720
41%
1144
October16th to endNight
63%
768
33%
2222
29%
768
69%
768
38%
1274
November1st to 15thNight
64%
760
30%
2420
27%
760
72%
760
40%
1278
November16th to endNight
55%
780
29%
2535
25%
780
65%
780
35%
1390
December1st to 15thNight
51%
728
26%
2365
23%
728
58%
728
30%
1397
December16th to endNight
48%
768
20%
2496
19%
768
53%
768
24%
1577

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
8%4245%35%5%6%9%44%
48545
Night
8%42442446%8%48%
48098
TransparencyDay
34%8%15%20%15%6%
48252
Night
32%6%14%21%17%7%
47895
SeeingDay
9%313%26%27%20%
5663
Night
9%415%27%31%11%
15780

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 15thDay
11%5%345%25%5%5%7%45%
1631
16th to endDay
12%5%35%5%34446%45%
1920
February1st to 15thDay
15%324423445%49%
1750
16th to endDay
13%5%2342334452%
1580
March1st to 15thDay
6%21442445%9%52%
1875
16th to endDay
8%413313347%57%
2111
April1st to 15thDay
8%315%43445%8%49%
2079
16th to endDay
6%313323348%59%
2160
May1st to 15thDay
5%31332446%8%55%
2307
16th to endDay
432333446%9%53%
2431
June1st to 15thDay
7%426%5%36%6%8%12%37%
2340
16th to endDay
7%415%6%37%6%9%11%36%
2340
July1st to 15thDay
9%436%6%47%8%10%11%27%
2340
16th to endDay
7%5%36%7%5%7%7%9%12%27%
2400
August1st to 15thDay
10%5%26%7%47%8%9%12%24%
2160
16th to endDay
9%5%245%36%6%9%12%32%
2292
September1st to 15thDay
9%5%26%6%46%7%9%13%29%
1988
16th to endDay
7%4245%36%6%8%10%40%
1980
October1st to 15thDay
6%41442446%8%53%
1980
16th to endDay
8%413423445%56%
2001
November1st to 15thDay
7%32331345%8%56%
1765
16th to endDay
7%313424446%55%
1755
December1st to 15thDay
12%6%14423348%48%
1632
16th to endDay
13%7%35%446%5%5%8%35%
1728
January1st to 15thNight
11%7%25%43435%7%44%
2306
16th to endNight
14%6%35%42445%5%42%
2304
February1st to 15thNight
13%5%33323345%50%
2103
16th to endNight
12%5%34423345%50%
1893
March1st to 15thNight
8%4243245%6%8%49%
2085
16th to endNight
9%313224347%56%
2112
April1st to 15thNight
8%414325%46%9%50%
1878
16th to endNight
5%213325%45%8%58%
1800
May1st to 15thNight
5%214223449%58%
1643
16th to endNight
3212425%47%10%56%
1682
June1st to 15thNight
5%325%4436%7%11%45%
1620
16th to endNight
5%224435%46%11%49%
1620
July1st to 15thNight
5%4134446%10%12%41%
1620
16th to endNight
3335%6%36%6%8%14%37%
1765
August1st to 15thNight
6%3245%46%7%9%14%34%
1800
16th to endNight
9%3145%35%5%8%13%38%
1910
September1st to 15thNight
8%5%245%36%6%8%13%35%
1959
16th to endNight
7%4245%345%7%10%42%
1980
October1st to 15thNight
33144236%5%9%53%
1980
16th to endNight
8%424423346%55%
2222
November1st to 15thNight
6%313423446%58%
2420
16th to endNight
9%423324346%55%
2535
December1st to 15thNight
11%5%24423448%48%
2365
16th to endNight
13%6%35%5%35%5%45%42%
2496

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
38%5%11%15%20%8%
1632
16th to endDay
39%5%8%15%21%9%
1920
February1st to 15thDay
36%47%17%22%11%
1752
16th to endDay
35%49%18%21%9%
1580
March1st to 15thDay
28%5%12%23%21%7%
1875
16th to endDay
27%413%24%20%9%
2112
April1st to 15thDay
32%6%10%22%20%8%
2079
16th to endDay
24%5%13%29%21%6%
2160
May1st to 15thDay
25%7%14%24%20%8%
2307
16th to endDay
25%6%19%28%16%2
2435
June1st to 15thDay
36%10%23%24%5%
2340
16th to endDay
36%12%22%20%7%
2340
July1st to 15thDay
42%14%25%16%1
2201
16th to endDay
40%14%25%16%2
2250
August1st to 15thDay
45%16%22%12%2
2148
16th to endDay
38%15%23%16%5%
2292
September1st to 15thDay
39%15%22%14%6%2
1988
16th to endDay
34%11%16%19%12%5%
1980
October1st to 15thDay
27%7%11%20%20%12%
1980
16th to endDay
29%46%16%26%16%
2001
November1st to 15thDay
26%5%11%22%23%11%
1765
16th to endDay
27%5%9%21%23%12%
1755
December1st to 15thDay
35%413%21%18%6%
1632
16th to endDay
45%6%10%18%13%6%
1728
January1st to 15thNight
38%410%16%21%8%
2306
16th to endNight
42%45%15%21%10%
2304
February1st to 15thNight
35%46%16%24%12%
2112
16th to endNight
35%39%17%20%12%
1893
March1st to 15thNight
30%6%11%22%21%7%
2085
16th to endNight
28%49%23%21%12%
2112
April1st to 15thNight
29%6%11%18%23%10%
1878
16th to endNight
23%5%9%31%22%8%
1800
May1st to 15thNight
23%5%13%24%22%10%
1644
16th to endNight
22%6%17%29%19%4
1684
June1st to 15thNight
29%8%22%31%8%
1620
16th to endNight
27%8%25%25%11%
1620
July1st to 15thNight
30%13%29%24%2
1530
16th to endNight
30%13%30%20%4
1652
August1st to 15thNight
34%13%31%17%3
1788
16th to endNight
35%11%25%22%4
1910
September1st to 15thNight
36%12%23%17%8%1
1959
16th to endNight
34%9%17%19%15%3
1980
October1st to 15thNight
26%7%12%18%22%12%
1980
16th to endNight
30%36%14%26%18%
2222
November1st to 15thNight
26%47%23%24%12%
2420
16th to endNight
29%48%18%21%16%
2535
December1st to 15thNight
35%49%24%20%5%
2365
16th to endNight
40%6%10%22%13%6%
2496

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
12%10%37%27%11%1
90
16th to endDay
11%20%32%30%5%
96
February1st to 15thDay
7%12%34%34%11%
90
16th to endDay
11%443%34%6%
81
March1st to 15thDay
8%7%36%30%15%1
165
16th to endDay
10%5%25%33%21%3
288
April1st to 15thDay
10%8%24%30%22%4
270
16th to endDay
10%117%34%29%6%
270
May1st to 15thDay
5%414%31%28%14%
288
16th to endDay
6%16%23%34%26%
331
June1st to 15thDay
12%320%31%31%
315
16th to endDay
9%2118%26%40%
315
July1st to 15thDay
6%15%32%52%
305
16th to endDay
6%39%32%47%
326
August1st to 15thDay
14%1111%35%35%
313
16th to endDay
6%317%35%36%
332
September1st to 15thDay
13%26%21%27%27%
315
16th to endDay
8%1426%38%20%
314
October1st to 15thDay
6%114%36%29%10%
315
16th to endDay
6%5%19%38%24%5%
336
November1st to 15thDay
7%216%45%20%7%
183
16th to endDay
6%230%39%17%3
135
December1st to 15thDay
10%6%29%35%15%2
94
16th to endDay
19%7%27%33%11%1
96
January1st to 15thNight
14%10%28%29%15%1
720
16th to endNight
16%10%25%33%14%
768
February1st to 15thNight
15%7%27%32%15%1
704
16th to endNight
15%7%25%38%12%
631
March1st to 15thNight
9%426%38%19%1
720
16th to endNight
10%420%34%27%1
768
April1st to 15thNight
10%319%36%28%1
620
16th to endNight
5%218%31%38%3
540
May1st to 15thNight
6%212%36%34%7%
540
16th to endNight
318%19%55%11%
563
June1st to 15thNight
7%1318%48%20%
540
16th to endNight
5%212%49%29%
540
July1st to 15thNight
6%17%42%41%
510
16th to endNight
318%47%37%
564
August1st to 15thNight
417%45%41%
539
16th to endNight
10%1210%44%30%
573
September1st to 15thNight
9%1414%43%25%
699
16th to endNight
9%1426%44%13%
717
October1st to 15thNight
4115%31%37%8%
720
16th to endNight
8%415%34%31%5%
768
November1st to 15thNight
6%5%16%37%30%4
760
16th to endNight
9%6%22%34%23%2
780
December1st to 15thNight
11%6%24%33%21%2
728
16th to endNight
14%6%23%35%19%1
768
Page generated at 2017-12-03 11:16:44. Version ac04

Copyright 2017 A. Danko


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