Newman Vista Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Newman Vista Point clear sky chart from 2005-11-05 to 2017-08-12.

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
72%
15258
30%
46530
26%
15222
77%
15222
48%
23144

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
66%
716
19%
2422
19%
716
69%
716
33%
1365
January16th to endNight
66%
768
24%
2496
25%
768
69%
768
32%
1445
February1st to 15thNight
64%
699
26%
2247
26%
699
68%
699
33%
1297
February16th to endNight
61%
632
25%
1895
22%
632
66%
632
36%
1101
March1st to 15thNight
62%
720
20%
2052
18%
720
66%
720
35%
1229
March16th to endNight
60%
768
22%
2058
15%
768
65%
768
38%
1218
April1st to 15thNight
57%
719
26%
1799
13%
719
62%
719
41%
1073
April16th to endNight
62%
720
28%
1800
12%
720
68%
720
55%
954
May1st to 15thNight
69%
653
30%
1733
18%
653
73%
653
64%
838
May16th to endNight
71%
374
33%
1496
30%
374
81%
374
60%
521
June1st to 15thNight
76%
360
31%
1440
33%
360
86%
360
57%
521
June16th to endNight
88%
360
40%
1440
48%
360
93%
360
82%
416
July1st to 15thNight
92%
340
36%
1360
45%
340
95%
340
79%
396
July16th to endNight
92%
556
38%
1585
34%
523
93%
523
74%
628
August1st to 15thNight
91%
585
41%
1634
30%
582
93%
582
83%
655
August16th to endNight
93%
700
43%
1750
27%
700
94%
700
88%
754
September1st to 15thNight
90%
660
46%
1650
33%
660
92%
660
84%
732
September16th to endNight
84%
656
45%
1776
39%
656
88%
656
76%
769
October1st to 15thNight
76%
660
32%
1980
32%
660
81%
660
54%
943
October16th to endNight
77%
704
38%
2112
38%
704
83%
704
58%
972
November1st to 15thNight
75%
700
32%
2224
31%
700
80%
700
50%
1041
November16th to endNight
71%
720
27%
2373
27%
720
76%
720
41%
1214
December1st to 15thNight
63%
720
21%
2520
19%
720
69%
720
27%
1491
December16th to endNight
57%
768
22%
2688
20%
768
63%
768
27%
1571

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
5%212212335%68%
47440
Night
6%212212235%68%
46715
TransparencyDay
19%410%19%25%20%
47123
Night
19%5%10%20%24%19%
46531
SeeingDay
6%5%17%29%28%11%
5808
Night
6%214%37%32%6%
15269

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
10%7%26%423348%46%
1513
16th to endDay
13%6%15%4345%46%43%
1728
February1st to 15thDay
12%5%2432445%7%47%
1614
16th to endDay
13%424424346%48%
1579
March1st to 15thDay
8%41332446%10%49%
1906
16th to endDay
7%4144245%5%7%51%
2166
April1st to 15thDay
8%6%35%32335%6%53%
2149
16th to endDay
5%22223335%67%
2160
May1st to 15thDay
1111112346%74%
2213
16th to endDay
212212345%72%
2615
June1st to 15thDay
1112212235%75%
2520
16th to endDay
111289%
2520
July1st to 15thDay
111289%
2520
16th to endDay
11111287%
2474
August1st to 15thDay
11111189%
2228
16th to endDay
1112289%
2100
September1st to 15thDay
111289%
1980
16th to endDay
111122483%
1851
October1st to 15thDay
212212246%73%
1650
16th to endDay
4213212245%68%
1760
November1st to 15thDay
6%21222445%6%61%
1634
16th to endDay
8%4243235%6%8%51%
1584
December1st to 15thDay
11%5%26%6%34346%44%
1440
16th to endDay
11%6%35%415%347%45%
1536
January1st to 15thNight
9%5%2421235%8%53%
2422
16th to endNight
12%412323446%53%
2496
February1st to 15thNight
11%41342435%7%52%
2236
16th to endNight
12%313313347%55%
1895
March1st to 15thNight
9%42331335%7%53%
2052
16th to endNight
7%313314448%56%
2058
April1st to 15thNight
7%313324448%56%
1799
16th to endNight
3112212346%71%
1800
May1st to 15thNight
211212135%76%
1733
16th to endNight
211111125%80%
1496
June1st to 15thNight
1111223480%
1440
16th to endNight
11291%
1440
July1st to 15thNight
121387%
1440
16th to endNight
111112284%
1692
August1st to 15thNight
1111289%
1643
16th to endNight
111290%
1750
September1st to 15thNight
1290%
1650
16th to endNight
111112385%
1776
October1st to 15thNight
3211222236%71%
1980
16th to endNight
42211123474%
2112
November1st to 15thNight
5%211212346%68%
2224
16th to endNight
5%312224346%61%
2373
December1st to 15thNight
10%424414347%50%
2520
16th to endNight
14%323324346%52%
2688

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
39%7%13%18%17%4
1513
16th to endDay
40%7%11%17%17%5%
1728
February1st to 15thDay
35%7%14%23%15%3
1614
16th to endDay
36%6%14%24%14%2
1579
March1st to 15thDay
31%9%15%21%18%3
1906
16th to endDay
30%9%17%21%17%3
2166
April1st to 15thDay
32%6%13%23%19%4
2149
16th to endDay
19%5%13%26%27%8%
2160
May1st to 15thDay
11%311%27%34%12%
2213
16th to endDay
13%314%26%30%11%
2619
June1st to 15thDay
12%410%23%25%23%
2520
16th to endDay
5%1314%33%42%
2520
July1st to 15thDay
4128%21%61%
2371
16th to endDay
6%237%26%53%
2318
August1st to 15thDay
6%1211%29%49%
2212
16th to endDay
4212%36%42%
2100
September1st to 15thDay
31412%34%43%
1980
16th to endDay
7%25%24%37%23%
1851
October1st to 15thDay
13%49%25%27%19%
1650
16th to endDay
18%410%23%27%15%
1760
November1st to 15thDay
23%7%13%27%23%4
1634
16th to endDay
29%9%13%23%21%2
1584
December1st to 15thDay
41%6%14%16%17%3
1440
16th to endDay
40%8%13%18%15%3
1536
January1st to 15thNight
31%5%15%22%18%6%
2422
16th to endNight
31%7%13%15%19%12%
2496
February1st to 15thNight
32%5%11%24%18%6%
2247
16th to endNight
29%7%15%27%17%3
1895
March1st to 15thNight
29%8%15%20%17%8%
2052
16th to endNight
26%8%16%20%20%8%
2058
April1st to 15thNight
26%7%14%25%20%5%
1799
16th to endNight
15%6%14%24%26%12%
1800
May1st to 15thNight
12%39%23%32%17%
1734
16th to endNight
9%313%28%33%12%
1496
June1st to 15thNight
10%411%19%26%26%
1440
16th to endNight
31411%30%47%
1440
July1st to 15thNight
4128%21%61%
1360
16th to endNight
8%149%24%51%
1585
August1st to 15thNight
5%114%31%44%
1634
16th to endNight
41312%33%45%
1750
September1st to 15thNight
5%139%28%51%
1650
16th to endNight
7%2418%36%29%
1776
October1st to 15thNight
15%5%9%22%24%22%
1980
16th to endNight
14%38%23%29%19%
2112
November1st to 15thNight
18%414%25%28%8%
2224
16th to endNight
23%5%12%24%26%6%
2373
December1st to 15thNight
34%7%12%18%19%6%
2520
16th to endNight
34%7%14%18%18%6%
2688

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
15%427%24%17%9%
141
16th to endDay
12%5%23%22%22%14%
256
February1st to 15thDay
16%8%15%21%23%14%
243
16th to endDay
14%8%23%27%18%7%
238
March1st to 15thDay
11%11%21%25%19%10%
270
16th to endDay
9%10%27%31%16%4
288
April1st to 15thDay
14%13%28%22%16%4
269
16th to endDay
6%14%28%30%16%3
270
May1st to 15thDay
48%26%32%21%5%
288
16th to endDay
38%20%30%28%9%
330
June1st to 15thDay
36%26%35%21%6%
315
16th to endDay
215%33%35%12%
315
July1st to 15thDay
6%34%44%13%
305
16th to endDay
15%34%42%16%
327
August1st to 15thDay
29%35%38%14%
300
16th to endDay
6%32%44%17%
268
September1st to 15thDay
18%27%41%20%
255
16th to endDay
1311%28%33%20%
255
October1st to 15thDay
37%17%28%28%15%
255
16th to endDay
5%417%29%29%13%
272
November1st to 15thDay
7%414%11%37%25%
140
16th to endDay
8%5%13%42%27%2
84
December1st to 15thDay
21%8%16%35%18%
60
16th to endDay
12%414%32%28%7%
64
January1st to 15thNight
12%312%33%29%10%
720
16th to endNight
14%113%31%30%9%
768
February1st to 15thNight
13%312%32%29%7%
704
16th to endNight
12%6%15%37%21%6%
632
March1st to 15thNight
10%416%33%28%6%
720
16th to endNight
8%422%36%25%2
768
April1st to 15thNight
7%5%24%38%21%2
719
16th to endNight
45%25%34%25%5%
720
May1st to 15thNight
3222%43%24%3
654
16th to endNight
1320%41%31%1
375
June1st to 15thNight
1217%52%24%1
360
16th to endNight
11%53%33%1
360
July1st to 15thNight
5%46%45%2
340
16th to endNight
1335%52%7%
556
August1st to 15thNight
15%45%44%4
585
16th to endNight
442%48%4
700
September1st to 15thNight
25%37%46%8%
660
16th to endNight
110%33%43%10%
656
October1st to 15thNight
3211%36%33%11%
660
16th to endNight
5%112%30%32%16%
704
November1st to 15thNight
5%112%34%35%9%
700
16th to endNight
6%214%33%33%9%
720
December1st to 15thNight
11%313%38%25%7%
720
16th to endNight
14%6%17%32%25%3
768
Page generated at 2017-08-13 11:16:22. Version ac04

Copyright 2017 A. Danko


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