Pinon Hills
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pinon Hills clear sky chart from 2005-11-05 to 2017-04-07.

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
69%
15315
35%
45247
27%
15269
76%
15269
53%
21650

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
52%
717
28%
2491
22%
716
64%
716
38%
1245
January16th to endNight
52%
768
33%
2305
22%
768
65%
768
38%
1259
February1st to 15thNight
58%
700
33%
2105
28%
697
69%
697
43%
1106
February16th to endNight
53%
632
29%
1895
25%
632
62%
632
35%
1090
March1st to 15thNight
59%
720
29%
2160
24%
720
69%
720
44%
1121
March16th to endNight
61%
768
32%
2017
21%
768
68%
768
50%
1075
April1st to 15thNight
56%
687
32%
1719
16%
687
64%
687
49%
951
April16th to endNight
60%
660
33%
1650
15%
660
67%
660
61%
844
May1st to 15thNight
69%
537
36%
1527
22%
537
74%
537
62%
693
May16th to endNight
66%
513
33%
1541
23%
513
71%
513
64%
662
June1st to 15thNight
78%
459
36%
1449
31%
459
83%
459
72%
563
June16th to endNight
91%
330
39%
1320
46%
330
94%
330
81%
386
July1st to 15thNight
94%
310
37%
1240
45%
310
94%
310
64%
423
July16th to endNight
90%
569
31%
1509
24%
531
91%
531
61%
704
August1st to 15thNight
94%
657
40%
1640
26%
653
94%
653
82%
734
August16th to endNight
94%
700
42%
1750
28%
700
94%
700
78%
809
September1st to 15thNight
93%
660
42%
1690
33%
660
94%
660
76%
769
September16th to endNight
85%
656
46%
1815
40%
656
90%
656
79%
746
October1st to 15thNight
73%
660
39%
1815
33%
660
79%
660
59%
872
October16th to endNight
75%
704
40%
2152
37%
704
82%
704
57%
963
November1st to 15thNight
70%
700
36%
2275
33%
700
80%
700
58%
971
November16th to endNight
67%
720
36%
2340
34%
720
75%
720
47%
1116
December1st to 15thNight
59%
720
32%
2340
26%
720
70%
720
39%
1194
December16th to endNight
50%
768
32%
2502
23%
768
62%
768
32%
1354

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
112212346%72%
45962
Night
111212346%73%
45444
TransparencyDay
15%46%15%27%30%
45651
Night
16%46%15%27%29%
45255
SeeingDay
313%33%35%11%2
5246
Night
25%19%33%31%7%
15325

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
211421446%6%64%
1440
16th to endDay
2314324448%59%
1917
February1st to 15thDay
121221335%9%64%
1751
16th to endDay
22135%3445%8%58%
1579
March1st to 15thDay
121131347%10%62%
1800
16th to endDay
1112145%8%10%62%
2202
April1st to 15thDay
1112323248%68%
2044
16th to endDay
111112248%75%
1980
May1st to 15thDay
11111338%76%
2092
16th to endDay
1112336%77%
2221
June1st to 15thDay
112236%80%
2177
16th to endDay
11111287%
2310
July1st to 15thDay
11212335%76%
2310
16th to endDay
112212347%72%
2234
August1st to 15thDay
11223483%
1980
16th to endDay
1113245%77%
2100
September1st to 15thDay
11112235%79%
1939
16th to endDay
111122383%
1815
October1st to 15thDay
11121335%5%73%
1815
16th to endDay
11112335%78%
1719
November1st to 15thDay
112213337%72%
1584
16th to endDay
211232235%7%69%
1620
December1st to 15thDay
111232347%9%62%
1620
16th to endDay
221432445%9%58%
1713
January1st to 15thNight
221332346%9%61%
2491
16th to endNight
2213325%35%8%61%
2305
February1st to 15thNight
221222326%8%63%
2101
16th to endNight
11133246%6%9%58%
1895
March1st to 15thNight
1222246%9%65%
2160
16th to endNight
1221337%9%65%
2017
April1st to 15thNight
11221435%5%70%
1719
16th to endNight
111111146%78%
1650
May1st to 15thNight
112246%79%
1527
16th to endNight
1111125%83%
1540
June1st to 15thNight
11225%85%
1449
16th to endNight
111291%
1320
July1st to 15thNight
121123381%
1320
16th to endNight
11212335%75%
1621
August1st to 15thNight
11111486%
1650
16th to endNight
1133384%
1750
September1st to 15thNight
1122484%
1690
16th to endNight
12487%
1815
October1st to 15thNight
1111335%5%75%
1815
16th to endNight
11111222480%
2152
November1st to 15thNight
11213335%75%
2275
16th to endNight
1121235%8%70%
2340
December1st to 15thNight
221232345%9%61%
2340
16th to endNight
321332445%8%60%
2502

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
21%6%7%16%28%19%
1440
16th to endDay
28%47%17%22%20%
1917
February1st to 15thDay
22%5%6%19%25%21%
1751
16th to endDay
28%6%7%17%27%12%
1579
March1st to 15thDay
19%5%9%23%22%19%
1800
16th to endDay
19%7%12%22%24%14%
2202
April1st to 15thDay
21%48%24%28%13%
2044
16th to endDay
13%5%8%21%32%19%
1980
May1st to 15thDay
10%5%9%20%29%24%
2092
16th to endDay
11%48%19%40%16%
2224
June1st to 15thDay
9%26%9%30%40%
2177
16th to endDay
6%135%23%59%
2310
July1st to 15thDay
10%347%19%53%
2161
16th to endDay
11%35%17%26%34%
2083
August1st to 15thDay
7%129%25%54%
1966
16th to endDay
9%2310%30%43%
2100
September1st to 15thDay
7%25%7%28%48%
1939
16th to endDay
8%139%32%45%
1815
October1st to 15thDay
16%35%15%29%29%
1815
16th to endDay
12%45%11%27%37%
1719
November1st to 15thDay
16%28%14%32%24%
1584
16th to endDay
19%5%6%16%26%26%
1620
December1st to 15thDay
21%6%12%19%23%17%
1620
16th to endDay
28%6%8%21%19%15%
1713
January1st to 15thNight
23%6%6%16%26%21%
2491
16th to endNight
25%6%8%14%22%22%
2305
February1st to 15thNight
23%5%7%16%24%22%
2112
16th to endNight
28%7%6%17%25%14%
1895
March1st to 15thNight
19%7%7%20%22%21%
2160
16th to endNight
19%5%10%22%27%15%
2017
April1st to 15thNight
20%5%9%25%23%16%
1719
16th to endNight
12%5%7%21%33%18%
1650
May1st to 15thNight
9%6%8%21%30%23%
1528
16th to endNight
8%5%9%21%39%15%
1541
June1st to 15thNight
7%35%15%29%38%
1449
16th to endNight
4127%23%60%
1320
July1st to 15thNight
9%348%16%58%
1240
16th to endNight
14%36%11%26%36%
1509
August1st to 15thNight
6%146%28%53%
1640
16th to endNight
8%139%33%44%
1750
September1st to 15thNight
7%35%6%28%48%
1690
16th to endNight
6%129%33%45%
1815
October1st to 15thNight
14%35%13%32%30%
1815
16th to endNight
12%5%48%30%38%
2152
November1st to 15thNight
14%37%15%33%27%
2275
16th to endNight
18%5%6%17%25%26%
2340
December1st to 15thNight
23%6%9%16%24%19%
2340
16th to endNight
26%7%8%17%24%15%
2502

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
6%29%29%31%3
61
16th to endDay
7%24%33%24%7%1
285
February1st to 15thDay
418%36%30%9%1
266
16th to endDay
7%24%34%23%9%
238
March1st to 15thDay
423%31%25%13%1
270
16th to endDay
419%40%26%8%1
288
April1st to 15thDay
6%24%41%17%7%2
234
16th to endDay
228%36%24%5%1
210
May1st to 15thDay
318%36%34%5%1
228
16th to endDay
312%43%30%7%2
266
June1st to 15thDay
112%39%38%7%1
255
16th to endDay
6%38%40%9%4
255
July1st to 15thDay
229%51%13%3
245
16th to endDay
223%54%13%6%
271
August1st to 15thDay
1132%45%10%7%
255
16th to endDay
1120%54%14%7%
268
September1st to 15thDay
1130%47%15%2
255
16th to endDay
15%29%44%17%1
255
October1st to 15thDay
215%36%34%10%1
255
16th to endDay
9%34%32%21%
223
November1st to 15thDay
210%16%28%35%6%
90
16th to endDay
216%41%28%11%
90
December1st to 15thDay
16%24%40%17%1
90
16th to endDay
10%15%34%27%11%
93
January1st to 15thNight
5%7%30%35%17%3
720
16th to endNight
5%10%26%31%22%3
768
February1st to 15thNight
38%24%36%22%3
704
16th to endNight
310%31%31%18%5%
632
March1st to 15thNight
26%28%37%20%4
720
16th to endNight
18%26%35%24%4
768
April1st to 15thNight
110%27%35%20%3
687
16th to endNight
17%29%31%23%6%
660
May1st to 15thNight
424%39%26%4
538
16th to endNight
1326%34%29%4
515
June1st to 15thNight
118%44%32%2
459
16th to endNight
6%44%45%3
330
July1st to 15thNight
1122%65%9%
310
16th to endNight
2328%54%10%
569
August1st to 15thNight
1328%53%13%
657
16th to endNight
1125%55%15%
700
September1st to 15thNight
1327%49%17%
660
16th to endNight
11%28%46%13%
656
October1st to 15thNight
1418%37%31%6%
660
16th to endNight
1317%33%30%13%
704
November1st to 15thNight
1321%36%29%7%
700
16th to endNight
2422%36%25%8%
720
December1st to 15thNight
5%8%22%36%22%3
720
16th to endNight
5%12%28%36%15%2
768
Page generated at 2017-04-08 02:35:16. Version ac04

Copyright 2017 A. Danko


Pinon Hills Clear Sky Chart | Charts Home