Camp Post
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Post clear sky chart from 2005-11-05 to 2017-10-06.

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
54%
15670
32%
47182
21%
15625
65%
15625
46%
23921

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
48%
898
33%
2327
16%
895
60%
895
49%
1254
January16th to endNight
45%
795
39%
2331
20%
795
62%
795
49%
1155
February1st to 15thNight
42%
704
31%
2111
15%
700
57%
700
40%
1097
February16th to endNight
36%
632
34%
1894
12%
632
54%
632
41%
967
March1st to 15thNight
37%
700
30%
2140
13%
700
51%
700
37%
1144
March16th to endNight
37%
576
31%
2075
19%
576
55%
576
40%
961
April1st to 15thNight
33%
539
32%
1798
16%
539
53%
539
40%
874
April16th to endNight
35%
540
33%
1800
18%
540
59%
540
46%
832
May1st to 15thNight
44%
540
29%
1632
18%
540
61%
540
43%
845
May16th to endNight
49%
563
28%
1684
20%
561
64%
561
46%
865
June1st to 15thNight
57%
540
25%
1620
20%
540
66%
540
52%
790
June16th to endNight
68%
540
27%
1620
25%
540
74%
540
53%
786
July1st to 15thNight
76%
510
23%
1530
25%
510
78%
510
44%
828
July16th to endNight
87%
564
32%
1616
36%
531
88%
531
55%
763
August1st to 15thNight
87%
539
30%
1789
38%
536
87%
536
49%
840
August16th to endNight
81%
573
28%
1910
31%
573
83%
573
44%
964
September1st to 15thNight
71%
540
26%
1893
29%
540
73%
540
33%
1042
September16th to endNight
69%
537
32%
1980
32%
537
73%
537
35%
1004
October1st to 15thNight
59%
513
36%
1881
29%
513
70%
513
45%
863
October16th to endNight
61%
692
40%
2100
25%
692
70%
692
57%
949
November1st to 15thNight
57%
875
36%
2275
16%
875
67%
875
58%
1148
November16th to endNight
51%
900
37%
2340
17%
900
62%
900
52%
1240
December1st to 15thNight
47%
900
37%
2340
17%
900
59%
900
49%
1281
December16th to endNight
43%
960
34%
2496
16%
960
55%
960
43%
1429

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
7%313323346%60%
48005
Night
6%312313346%62%
47382
Cloud CoverDay
7%313323346%59%
48003
Night
6%312313347%62%
47382
TransparencyDay
24%48%21%26%14%
47706
Night
22%38%20%26%17%
47184
SeeingDay
7%421%33%26%7%
5611
Night
7%5%28%38%18%1
15672

By Month

Percentage Cloud Cover SW (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
7%42221233463%
1611
16th to endDay
6%313313335%62%
1902
February1st to 15thDay
6%413312245%63%
1750
16th to endDay
8%5%12222335%62%
1580
March1st to 15thDay
8%313223346%58%
1818
16th to endDay
7%312323345%61%
2145
April1st to 15thDay
6%31331345%5%62%
2150
16th to endDay
5%313223235%66%
2160
May1st to 15thDay
10%422313346%57%
2316
16th to endDay
10%31332335%5%57%
2430
June1st to 15thDay
5%213212347%62%
2340
16th to endDay
5%21233345%7%61%
2340
July1st to 15thDay
8%212435%6%5%8%50%
2340
16th to endDay
421232335%9%60%
2439
August1st to 15thDay
311232445%8%62%
2160
16th to endDay
5%314445%5%6%8%49%
2292
September1st to 15thDay
13%315%42435%7%47%
2067
16th to endDay
11%314323445%55%
1980
October1st to 15thDay
10%31332332460%
1876
16th to endDay
42221222473%
1758
November1st to 15thDay
5%212212336%68%
1583
16th to endDay
8%21322222467%
1620
December1st to 15thDay
9%323312336%58%
1620
16th to endDay
8%5%12213346%58%
1728
January1st to 15thNight
7%312312245%64%
2327
16th to endNight
5%312213245%67%
2331
February1st to 15thNight
7%5%2321224462%
2102
16th to endNight
7%412212335%63%
1894
March1st to 15thNight
7%5%23314346%56%
2140
16th to endNight
5%21232345%7%62%
2075
April1st to 15thNight
6%313312336%63%
1798
16th to endNight
5%212222245%67%
1800
May1st to 15thNight
8%212313335%64%
1631
16th to endNight
5%21322336%8%60%
1683
June1st to 15thNight
311332345%9%62%
1620
16th to endNight
21232446%10%60%
1620
July1st to 15thNight
5%21332446%10%54%
1620
16th to endNight
31221445%11%61%
1726
August1st to 15thNight
221232446%9%59%
1800
16th to endNight
421342445%10%56%
1910
September1st to 15thNight
11%31342446%8%49%
1893
16th to endNight
9%32331445%6%56%
1980
October1st to 15thNight
7%213212235%65%
1881
16th to endNight
421121122375%
2100
November1st to 15thNight
3112212345%70%
2275
16th to endNight
6%312312236%66%
2340
December1st to 15thNight
9%312312245%62%
2340
16th to endNight
8%5%13323235%60%
2496

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
7%42311333463%
1611
16th to endDay
6%324323336%61%
1902
February1st to 15thDay
6%413312235%63%
1750
16th to endDay
8%5%12212326%62%
1580
March1st to 15thDay
8%413314346%58%
1818
16th to endDay
6%31232434462%
2143
April1st to 15thDay
6%31322245%6%61%
2150
16th to endDay
4313323235%66%
2160
May1st to 15thDay
10%413213245%57%
2316
16th to endDay
9%32332445%5%56%
2430
June1st to 15thDay
431222335%7%62%
2340
16th to endDay
421332346%6%60%
2340
July1st to 15thDay
8%213436%5%6%8%49%
2340
16th to endDay
331232435%10%59%
2439
August1st to 15thDay
311232445%8%62%
2160
16th to endDay
5%314435%5%6%8%49%
2292
September1st to 15thDay
12%425%5%2435%7%46%
2067
16th to endDay
11%313323445%56%
1980
October1st to 15thDay
9%31242233460%
1876
16th to endDay
321231232472%
1758
November1st to 15thDay
5%212112346%68%
1583
16th to endDay
7%21222222467%
1620
December1st to 15thDay
9%323313336%58%
1620
16th to endDay
8%6%13223346%58%
1728
January1st to 15thNight
7%313312245%64%
2327
16th to endNight
5%312313235%67%
2331
February1st to 15thNight
7%42331224462%
2102
16th to endNight
7%412223345%63%
1894
March1st to 15thNight
6%6%14214445%57%
2140
16th to endNight
5%21232335%6%62%
2075
April1st to 15thNight
6%312313336%63%
1798
16th to endNight
5%212223245%66%
1800
May1st to 15thNight
8%212212335%63%
1631
16th to endNight
5%22221336%8%59%
1683
June1st to 15thNight
31331335%10%62%
1620
16th to endNight
21132346%11%61%
1620
July1st to 15thNight
421332446%10%55%
1620
16th to endNight
311221445%12%61%
1726
August1st to 15thNight
311232447%9%59%
1800
16th to endNight
42133245%6%10%56%
1910
September1st to 15thNight
11%31343435%9%48%
1893
16th to endNight
8%31422445%7%55%
1980
October1st to 15thNight
7%213212235%65%
1881
16th to endNight
421221222474%
2100
November1st to 15thNight
3212212345%69%
2275
16th to endNight
6%312212235%66%
2340
December1st to 15thNight
9%312313245%62%
2340
16th to endNight
8%5%13313336%59%
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
25%26%23%26%15%
1612
16th to endDay
25%25%16%34%16%
1902
February1st to 15thDay
23%26%20%27%19%
1751
16th to endDay
25%2417%31%18%
1580
March1st to 15thDay
26%35%17%31%15%
1818
16th to endDay
23%36%21%24%19%
2145
April1st to 15thDay
22%38%14%25%24%
2150
16th to endDay
20%36%19%27%23%
2160
May1st to 15thDay
28%46%16%23%20%
2316
16th to endDay
28%48%18%24%15%
2434
June1st to 15thDay
20%411%27%23%12%
2340
16th to endDay
22%5%11%25%22%12%
2340
July1st to 15thDay
28%6%16%24%19%3
2201
16th to endDay
18%5%17%32%22%3
2286
August1st to 15thDay
19%415%27%26%6%
2147
16th to endDay
29%7%12%27%16%6%
2292
September1st to 15thDay
36%412%21%19%5%
2067
16th to endDay
30%46%22%26%9%
1980
October1st to 15thDay
28%48%19%25%12%
1876
16th to endDay
16%25%18%35%22%
1758
November1st to 15thDay
18%27%21%31%19%
1583
16th to endDay
22%2414%32%23%
1620
December1st to 15thDay
27%25%23%28%11%
1620
16th to endDay
26%35%23%29%11%
1728
January1st to 15thNight
23%26%21%26%20%
2327
16th to endNight
20%26%15%32%22%
2331
February1st to 15thNight
26%26%16%24%23%
2112
16th to endNight
24%25%16%27%24%
1894
March1st to 15thNight
28%36%16%24%21%
2140
16th to endNight
22%39%23%25%16%
2075
April1st to 15thNight
22%48%17%23%23%
1798
16th to endNight
18%49%18%25%23%
1800
May1st to 15thNight
23%39%17%21%23%
1632
16th to endNight
21%5%13%19%20%18%
1685
June1st to 15thNight
18%413%26%24%12%
1620
16th to endNight
17%414%27%21%14%
1620
July1st to 15thNight
25%5%12%29%21%6%
1530
16th to endNight
15%5%13%32%27%5%
1616
August1st to 15thNight
18%5%12%24%29%9%
1789
16th to endNight
21%6%15%24%24%7%
1910
September1st to 15thNight
31%5%11%22%21%7%
1893
16th to endNight
27%5%8%20%25%13%
1980
October1st to 15thNight
21%310%25%22%16%
1881
16th to endNight
16%2417%35%24%
2100
November1st to 15thNight
17%26%21%31%21%
2275
16th to endNight
21%25%13%30%27%
2340
December1st to 15thNight
24%15%21%29%17%
2340
16th to endNight
28%25%19%28%16%
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
16%433%26%17%1
90
16th to endDay
311%40%31%11%2
96
February1st to 15thDay
6%431%35%18%3
90
16th to endDay
9%434%37%11%2
81
March1st to 15thDay
5%242%35%14%
90
16th to endDay
210%33%31%18%3
129
April1st to 15thDay
8%16%40%28%5%
269
16th to endDay
6%18%40%25%7%2
270
May1st to 15thDay
10%8%38%31%9%1
453
16th to endDay
12%432%31%17%2
517
June1st to 15thDay
5%122%43%23%3
495
16th to endDay
5%113%38%33%8%
495
July1st to 15thDay
7%5%38%37%10%
475
16th to endDay
3227%49%16%
488
August1st to 15thDay
2328%49%14%
315
16th to endDay
416%36%37%13%
332
September1st to 15thDay
45%34%38%15%
222
16th to endDay
19%210%23%32%11%
135
October1st to 15thDay
10%14%41%29%3
107
16th to endDay
8%121%31%28%9%
96
November1st to 15thDay
18%6%11%27%24%11%
90
16th to endDay
14%13%35%18%13%4
90
December1st to 15thDay
8%6%35%32%16%
90
16th to endDay
10%16%35%32%41
96
January1st to 15thNight
9%5%32%40%12%
900
16th to endNight
6%7%35%39%9%
795
February1st to 15thNight
9%8%35%34%10%1
704
16th to endNight
10%10%40%32%6%
632
March1st to 15thNight
10%9%39%34%6%
700
16th to endNight
6%11%42%32%5%
576
April1st to 15thNight
8%10%45%31%4
539
16th to endNight
5%9%47%32%4
540
May1st to 15thNight
7%7%38%39%6%
540
16th to endNight
4339%36%15%
563
June1st to 15thNight
3232%45%17%
540
16th to endNight
2222%46%25%
540
July1st to 15thNight
5%9%46%35%1
510
16th to endNight
2243%47%3
564
August1st to 15thNight
21237%53%2
539
16th to endNight
5%5%40%44%3
573
September1st to 15thNight
11%7%38%38%3
540
16th to endNight
10%111%43%30%2
537
October1st to 15thNight
8%125%40%21%1
513
16th to endNight
5%424%39%22%2
692
November1st to 15thNight
4430%39%20%1
875
16th to endNight
8%6%30%38%15%1
900
December1st to 15thNight
10%5%33%37%12%
900
16th to endNight
10%8%34%35%10%
960
Page generated at 2017-10-07 13:07:51. Version ac04

Copyright 2017 A. Danko


Camp Post Clear Sky Chart | Charts Home