Juniper Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Juniper Campground clear sky chart from 2005-11-05 to 2018-01-12.

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
63%
16229
31%
48398
22%
16186
71%
16186
47%
24780

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
63%
796
33%
2504
27%
793
73%
793
55%
1127
January16th to endNight
58%
768
35%
2496
27%
768
70%
768
50%
1163
February1st to 15thNight
55%
701
28%
2229
20%
700
65%
700
47%
1082
February16th to endNight
49%
632
38%
1894
23%
632
65%
632
51%
928
March1st to 15thNight
53%
720
33%
2031
20%
720
62%
720
48%
1081
March16th to endNight
55%
725
34%
2069
19%
725
66%
725
52%
1017
April1st to 15thNight
41%
539
31%
1798
17%
539
59%
539
42%
877
April16th to endNight
47%
540
34%
1800
22%
540
66%
540
46%
826
May1st to 15thNight
55%
540
25%
1796
19%
539
66%
539
40%
906
May16th to endNight
55%
563
31%
1534
19%
561
67%
561
48%
808
June1st to 15thNight
67%
540
27%
1440
18%
540
73%
540
53%
749
June16th to endNight
76%
540
26%
1440
20%
540
79%
540
51%
770
July1st to 15thNight
76%
510
14%
1431
13%
510
76%
510
31%
906
July16th to endNight
78%
564
14%
1593
14%
531
79%
531
28%
999
August1st to 15thNight
79%
539
15%
1697
16%
536
79%
536
32%
1005
August16th to endNight
79%
573
22%
1910
26%
573
79%
573
30%
1110
September1st to 15thNight
76%
540
23%
1800
24%
540
78%
540
31%
1044
September16th to endNight
73%
576
35%
1938
31%
576
79%
576
47%
923
October1st to 15thNight
65%
720
33%
2160
23%
720
72%
720
51%
1072
October16th to endNight
70%
768
41%
2304
28%
768
78%
768
60%
1041
November1st to 15thNight
70%
845
39%
2365
26%
845
76%
845
66%
1069
November16th to endNight
65%
975
41%
2535
26%
975
72%
975
60%
1273
December1st to 15thNight
58%
975
31%
2722
19%
975
65%
975
51%
1402
December16th to endNight
53%
1040
31%
2912
20%
1040
63%
1040
46%
1602

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
221232446%8%60%
48926
Night
331232345%7%63%
48591
TransparencyDay
20%6%12%23%25%12%
48618
Night
20%5%11%22%26%12%
48400
SeeingDay
5%9%25%32%23%4
5921
Night
4324%42%23%2
16233

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
12221235%8%69%
1687
16th to endDay
3211322347%67%
1728
February1st to 15thDay
1413413347%62%
1631
16th to endDay
31331345%9%62%
1580
March1st to 15thDay
132333435%7%61%
1926
16th to endDay
121322445%7%64%
2154
April1st to 15thDay
221222446%8%62%
2150
16th to endDay
231232345%8%62%
2160
May1st to 15thDay
32232445%8%61%
2151
16th to endDay
321221336%8%64%
2576
June1st to 15thDay
1122145%5%8%65%
2520
16th to endDay
11321446%10%63%
2520
July1st to 15thDay
33135%36%7%9%12%42%
2440
16th to endDay
42235%48%7%11%13%37%
2467
August1st to 15thDay
4214447%6%9%12%42%
2253
16th to endDay
4323436%6%8%11%45%
2292
September1st to 15thDay
6%413435%6%7%8%48%
2160
16th to endDay
32222335%6%67%
2018
October1st to 15thDay
5%212223346%66%
1800
16th to endDay
221212235%75%
1920
November1st to 15thDay
111112346%74%
1808
16th to endDay
2311212235%72%
1755
December1st to 15thDay
221322235%7%68%
1566
16th to endDay
2412324449%59%
1664
January1st to 15thNight
1212212346%71%
2504
16th to endNight
3412212347%68%
2496
February1st to 15thNight
1414312346%66%
2219
16th to endNight
1312323346%68%
1894
March1st to 15thNight
1413323346%63%
2031
16th to endNight
3212212335%69%
2069
April1st to 15thNight
221342335%8%62%
1798
16th to endNight
3312313336%68%
1800
May1st to 15thNight
4312324346%62%
1796
16th to endNight
3212323345%66%
1534
June1st to 15thNight
111222445%7%65%
1440
16th to endNight
112326%5%6%9%60%
1440
July1st to 15thNight
43145%47%7%9%11%40%
1517
16th to endNight
32146%38%8%10%12%38%
1701
August1st to 15thNight
33235%35%6%9%12%43%
1706
16th to endNight
5%213436%7%10%11%43%
1910
September1st to 15thNight
5%314435%7%8%10%45%
1800
16th to endNight
5%22213346%65%
1938
October1st to 15thNight
5%211222335%68%
2160
16th to endNight
311112335%73%
2304
November1st to 15thNight
111112235%77%
2365
16th to endNight
2312212235%73%
2535
December1st to 15thNight
3312322246%67%
2722
16th to endNight
2413323447%62%
2912

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
14%5%12%34%29%3
1688
16th to endDay
18%411%28%29%6%
1728
February1st to 15thDay
21%5%13%28%21%9%
1632
16th to endDay
19%39%26%31%9%
1580
March1st to 15thDay
20%5%8%23%32%9%
1926
16th to endDay
18%5%8%24%32%10%
2154
April1st to 15thDay
18%6%9%23%28%12%
2150
16th to endDay
20%48%20%30%15%
2160
May1st to 15thDay
19%6%11%19%29%13%
2151
16th to endDay
17%5%8%21%26%20%
2579
June1st to 15thDay
14%5%11%15%22%30%
2520
16th to endDay
14%410%17%24%28%
2520
July1st to 15thDay
29%10%17%16%14%11%
2297
16th to endDay
28%13%23%25%7%1
2312
August1st to 15thDay
27%12%21%19%14%5%
2238
16th to endDay
27%10%17%24%15%5%
2292
September1st to 15thDay
29%8%16%21%17%7%
2160
16th to endDay
17%47%22%31%16%
2018
October1st to 15thDay
19%47%18%33%16%
1800
16th to endDay
14%27%22%37%14%
1920
November1st to 15thDay
12%39%28%33%12%
1808
16th to endDay
16%26%26%35%11%
1755
December1st to 15thDay
17%416%33%22%4
1566
16th to endDay
23%6%14%28%22%3
1664
January1st to 15thNight
15%411%33%29%5%
2504
16th to endNight
18%411%26%32%6%
2496
February1st to 15thNight
20%413%27%23%10%
2229
16th to endNight
18%48%21%33%13%
1894
March1st to 15thNight
22%47%24%32%8%
2031
16th to endNight
18%46%20%36%14%
2069
April1st to 15thNight
21%5%9%22%26%15%
1798
16th to endNight
18%5%8%18%33%16%
1800
May1st to 15thNight
23%6%8%18%28%15%
1797
16th to endNight
20%5%10%18%23%22%
1535
June1st to 15thNight
18%412%15%20%29%
1440
16th to endNight
18%6%12%14%18%29%
1440
July1st to 15thNight
30%13%19%13%10%12%
1431
16th to endNight
31%13%23%21%9%1
1593
August1st to 15thNight
28%11%21%19%10%7%
1697
16th to endNight
28%12%17%22%13%6%
1910
September1st to 15thNight
29%10%18%18%13%9%
1800
16th to endNight
19%411%16%27%19%
1938
October1st to 15thNight
19%48%16%30%19%
2160
16th to endNight
14%27%18%37%19%
2304
November1st to 15thNight
11%37%26%38%12%
2365
16th to endNight
16%25%24%34%15%
2535
December1st to 15thNight
20%311%31%25%5%
2722
16th to endNight
23%6%12%29%25%2
2912

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
412%36%30%13%1
123
16th to endDay
6%6%42%26%12%6%
96
February1st to 15thDay
1431%45%16%1
90
16th to endDay
412%30%30%20%
81
March1st to 15thDay
5%16%31%35%11%1
216
16th to endDay
5%26%33%22%10%1
288
April1st to 15thDay
7%24%33%24%7%1
269
16th to endDay
9%26%36%20%5%
270
May1st to 15thDay
6%16%40%26%9%
288
16th to endDay
410%32%34%16%1
477
June1st to 15thDay
28%23%33%30%1
495
16th to endDay
2217%35%35%6%
495
July1st to 15thDay
4113%34%36%8%
401
16th to endDay
6%8%32%35%16%
327
August1st to 15thDay
6%112%31%37%10%
315
16th to endDay
7%113%34%34%8%
332
September1st to 15thDay
6%319%39%25%6%
315
16th to endDay
7%6%27%34%20%2
215
October1st to 15thDay
46%31%31%24%2
135
16th to endDay
37%17%35%29%6%
144
November1st to 15thDay
5%10%22%41%18%1
135
16th to endDay
410%38%28%17%
135
December1st to 15thDay
25%32%40%17%
135
16th to endDay
10%8%30%41%8%
144
January1st to 15thNight
2226%47%18%2
797
16th to endNight
6%230%44%14%2
768
February1st to 15thNight
5%230%46%13%
704
16th to endNight
25%40%44%6%
632
March1st to 15thNight
45%32%44%12%
720
16th to endNight
37%32%44%12%
725
April1st to 15thNight
49%41%35%8%
539
16th to endNight
46%40%39%9%
540
May1st to 15thNight
5%5%30%45%12%
540
16th to endNight
3430%38%21%1
563
June1st to 15thNight
1324%45%24%
540
16th to endNight
115%48%32%1
540
July1st to 15thNight
5%17%34%47%3
510
16th to endNight
315%25%55%9%
564
August1st to 15thNight
5%428%53%7%
539
16th to endNight
6%6%30%49%6%
573
September1st to 15thNight
6%19%40%39%2
540
16th to endNight
6%113%44%30%3
576
October1st to 15thNight
5%223%45%21%2
720
16th to endNight
421%39%28%4
768
November1st to 15thNight
2222%46%24%1
845
16th to endNight
4422%42%23%2
975
December1st to 15thNight
6%229%46%12%1
975
16th to endNight
5%5%32%44%11%
1040
Page generated at 2018-01-12 20:01:37. Version ac04

Copyright 2018 A. Danko


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