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 2017-03-24.

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
61%
14914
23%
45286
19%
14874
66%
14874
32%
26886

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
57%
740
27%
2035
17%
740
62%
740
40%
1174
April1st to 15thNight
58%
568
26%
1721
22%
568
63%
568
35%
1001
April16th to endNight
66%
495
29%
1650
26%
495
73%
495
40%
839
May1st to 15thNight
72%
494
28%
1506
26%
494
76%
494
42%
799
May16th to endNight
79%
513
26%
1538
24%
513
81%
513
46%
813
June1st to 15thNight
80%
495
20%
1485
18%
495
80%
495
39%
837
June16th to endNight
80%
495
18%
1485
18%
495
80%
495
38%
838
July1st to 15thNight
77%
465
12%
1395
13%
465
77%
465
28%
889
July16th to endNight
78%
522
12%
1521
13%
489
78%
489
29%
946
August1st to 15thNight
77%
494
9%
1638
12%
491
78%
491
24%
1050
August16th to endNight
72%
525
14%
1750
17%
525
72%
525
24%
1107
September1st to 15thNight
74%
641
13%
1796
12%
641
74%
641
28%
1197
September16th to endNight
69%
657
22%
1815
21%
657
69%
657
29%
1187
October1st to 15thNight
69%
660
31%
1815
25%
660
73%
660
41%
1045
October16th to endNight
63%
704
30%
2037
27%
704
68%
704
37%
1188
November1st to 15thNight
63%
700
30%
2229
28%
700
70%
700
38%
1194
November16th to endNight
53%
720
28%
2340
24%
720
63%
720
34%
1294
December1st to 15thNight
51%
720
26%
2340
24%
720
58%
720
30%
1383
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%
45631
Night
8%42442446%8%48%
45498
TransparencyDay
33%8%15%20%15%6%
45338
Night
32%6%14%21%17%7%
45295
SeeingDay
8%313%25%26%21%
4689
Night
9%415%28%31%10%
14922

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%423313347%56%
2033
April1st to 15thDay
9%325%435%45%8%48%
1905
16th to endDay
6%313323348%59%
1980
May1st to 15thDay
5%31332446%8%54%
2114
16th to endDay
431333446%9%55%
2223
June1st to 15thDay
6%315%5%26%7%8%12%38%
2145
16th to endDay
6%4146%47%6%9%12%36%
2145
July1st to 15thDay
10%436%6%37%8%10%12%26%
2145
16th to endDay
7%5%36%7%48%7%9%12%27%
2224
August1st to 15thDay
9%5%27%7%5%8%8%9%13%23%
1980
16th to endDay
10%6%245%36%6%9%12%32%
2100
September1st to 15thDay
9%5%26%6%46%7%9%13%29%
1823
16th to endDay
8%4246%25%6%8%10%38%
1815
October1st to 15thDay
5%41442445%8%54%
1815
16th to endDay
8%414433445%55%
1834
November1st to 15thDay
7%32332345%8%54%
1626
16th to endDay
7%31342445%7%55%
1620
December1st to 15thDay
12%6%14423348%48%
1620
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
10%313224347%56%
2035
April1st to 15thNight
8%414425%46%9%48%
1721
16th to endNight
5%213325%45%7%57%
1650
May1st to 15thNight
6%214223449%57%
1506
16th to endNight
3212325%47%10%56%
1538
June1st to 15thNight
42243336%7%12%48%
1485
16th to endNight
4224425%47%11%50%
1485
July1st to 15thNight
6%4144446%10%12%39%
1485
16th to endNight
3335%6%36%6%8%14%38%
1634
August1st to 15thNight
5%3245%46%8%9%14%34%
1650
16th to endNight
10%4245%35%5%8%13%37%
1750
September1st to 15thNight
7%4245%35%6%8%13%36%
1796
16th to endNight
8%5%25%5%345%6%10%41%
1815
October1st to 15thNight
33144235%5%9%53%
1815
16th to endNight
8%5%24423445%54%
2037
November1st to 15thNight
6%313413446%57%
2229
16th to endNight
9%424434346%54%
2340
December1st to 15thNight
11%5%24423448%48%
2340
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
28%413%23%20%9%
2034
April1st to 15thDay
33%6%10%22%18%8%
1905
16th to endDay
24%5%12%29%21%6%
1980
May1st to 15thDay
25%7%16%25%18%6%
2114
16th to endDay
23%7%20%29%16%2
2227
June1st to 15thDay
33%10%24%26%5%
2145
16th to endDay
35%12%23%20%7%
2145
July1st to 15thDay
42%14%26%16%1
2006
16th to endDay
39%14%26%16%2
2074
August1st to 15thDay
45%16%22%12%2
1968
16th to endDay
39%15%22%16%5%
2100
September1st to 15thDay
39%16%23%14%5%1
1823
16th to endDay
35%11%16%18%13%5%
1815
October1st to 15thDay
26%7%11%21%20%13%
1815
16th to endDay
30%37%16%26%15%
1834
November1st to 15thDay
27%5%10%21%23%12%
1626
16th to endDay
27%5%10%21%21%13%
1620
December1st to 15thDay
35%413%21%19%6%
1620
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%
2035
April1st to 15thNight
30%6%12%18%21%9%
1721
16th to endNight
24%5%9%30%21%8%
1650
May1st to 15thNight
24%5%14%25%21%9%
1507
16th to endNight
21%6%17%30%19%3
1540
June1st to 15thNight
25%8%23%33%8%
1485
16th to endNight
26%8%26%26%12%
1485
July1st to 15thNight
32%13%28%23%2
1395
16th to endNight
30%13%30%21%4
1521
August1st to 15thNight
33%14%30%17%2
1638
16th to endNight
37%10%25%21%5%
1750
September1st to 15thNight
35%12%25%17%7%1
1796
16th to endNight
35%10%16%17%15%3
1815
October1st to 15thNight
26%7%11%19%22%14%
1815
16th to endNight
31%46%14%26%17%
2037
November1st to 15thNight
27%47%22%24%13%
2229
16th to endNight
30%5%9%17%21%16%
2340
December1st to 15thNight
36%49%24%20%5%
2340
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%24%34%21%3
260
April1st to 15thDay
11%6%24%29%22%4
210
16th to endDay
10%16%33%31%6%
210
May1st to 15thDay
5%312%33%28%16%
228
16th to endDay
45%18%38%31%
267
June1st to 15thDay
10%216%34%36%
255
16th to endDay
7%1118%25%45%
255
July1st to 15thDay
7%117%29%52%
245
16th to endDay
4127%31%51%
270
August1st to 15thDay
13%1111%33%37%
253
16th to endDay
5%1215%36%38%
268
September1st to 15thDay
12%2317%31%32%
255
16th to endDay
10%15%25%37%19%
254
October1st to 15thDay
5%111%40%29%10%
255
16th to endDay
7%417%38%24%6%
272
November1st to 15thDay
9%319%44%16%5%
134
16th to endDay
3336%38%13%4
90
December1st to 15thDay
11%6%31%34%14%2
90
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
11%420%34%28%1
740
April1st to 15thNight
10%318%38%27%1
568
16th to endNight
5%219%32%37%2
495
May1st to 15thNight
6%112%35%35%8%
495
16th to endNight
37%20%55%11%
515
June1st to 15thNight
6%1318%49%20%
495
16th to endNight
5%112%49%30%
495
July1st to 15thNight
7%17%44%37%
465
16th to endNight
318%46%39%
522
August1st to 15thNight
417%45%41%
494
16th to endNight
11%1210%44%30%
525
September1st to 15thNight
8%1412%45%27%
641
16th to endNight
10%15%28%42%12%
657
October1st to 15thNight
4114%32%38%7%
660
16th to endNight
9%414%33%32%5%
704
November1st to 15thNight
7%5%16%36%29%4
700
16th to endNight
9%6%23%34%22%2
720
December1st to 15thNight
11%6%24%33%21%2
720
16th to endNight
14%6%23%35%19%1
768
Page generated at 2017-03-25 12:39:51. Version ac04

Copyright 2017 A. Danko


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