Red Rock RV Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Red Rock RV Park clear sky chart from 2005-11-05 to 2017-09-18.

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
44%
15525
15%
46761
12%
15486
47%
15486
22%
31776

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
28%
824
8%
2613
6%
823
30%
823
11%
2074
January16th to endNight
33%
768
11%
2541
9%
768
37%
768
14%
1910
February1st to 15thNight
26%
699
8%
2288
6%
697
29%
697
12%
1756
February16th to endNight
27%
632
8%
1977
5%
632
31%
632
11%
1561
March1st to 15thNight
36%
720
9%
2028
7%
720
39%
720
18%
1495
March16th to endNight
38%
768
9%
2112
6%
768
41%
768
19%
1587
April1st to 15thNight
39%
608
10%
1802
6%
608
43%
608
19%
1292
April16th to endNight
40%
540
17%
1620
12%
540
44%
540
25%
1062
May1st to 15thNight
47%
539
14%
1619
12%
539
49%
539
25%
1028
May16th to endNight
44%
562
9%
1504
8%
561
45%
561
21%
1091
June1st to 15thNight
50%
378
11%
1278
10%
378
54%
378
21%
837
June16th to endNight
64%
360
23%
1260
23%
360
71%
360
39%
621
July1st to 15thNight
82%
340
21%
1190
26%
340
85%
340
46%
563
July16th to endNight
74%
497
25%
1514
28%
465
77%
465
53%
678
August1st to 15thNight
72%
539
25%
1611
23%
536
74%
536
44%
846
August16th to endNight
69%
573
33%
1719
26%
573
73%
573
48%
861
September1st to 15thNight
65%
627
26%
1878
21%
627
70%
627
41%
1034
September16th to endNight
66%
667
27%
1847
22%
667
69%
667
42%
1048
October1st to 15thNight
52%
660
21%
1947
16%
660
57%
660
32%
1203
October16th to endNight
49%
704
20%
2161
14%
704
55%
704
28%
1357
November1st to 15thNight
39%
760
14%
2335
12%
760
42%
760
19%
1659
November16th to endNight
34%
900
10%
2520
7%
900
37%
900
19%
1829
December1st to 15thNight
25%
900
5%
2520
3%
900
27%
900
10%
2080
December16th to endNight
24%
960
8%
2877
5%
960
28%
960
11%
2304

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
9%10%47%5%3445%6%38%
48038
Night
9%11%47%5%34446%39%
46931
Cloud CoverDay
8%10%47%6%35%45%6%38%
48039
Night
9%11%47%5%3445%6%38%
46933
TransparencyDay
45%6%12%19%12%4
47711
Night
45%6%14%19%10%3
46762
SeeingDay
15%17%30%22%11%1
5866
Night
14%8%25%34%15%1
15536

By Month

Percentage Cloud Cover NW (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%17%7%10%9%35%5%3422%
1334
16th to endDay
7%20%7%7%7%34445%28%
1680
February1st to 15thDay
7%17%7%11%6%25%5%45%26%
1575
16th to endDay
6%18%9%15%7%3433423%
1494
March1st to 15thDay
8%15%6%9%7%35%5%5%7%26%
1932
16th to endDay
10%18%6%9%5%45%5%46%23%
2111
April1st to 15thDay
10%17%5%9%6%4445%5%26%
2144
16th to endDay
10%15%5%9%6%34346%30%
2340
May1st to 15thDay
10%9%46%7%35%5%46%35%
2331
16th to endDay
16%10%49%7%36%5%5%6%24%
2608
June1st to 15thDay
18%6%26%6%35%6%6%7%31%
2681
16th to endDay
5%31443446%7%54%
2700
July1st to 15thDay
5%2134235%6%7%56%
2700
16th to endDay
321342435%6%62%
2545
August1st to 15thDay
5%3134345%6%8%53%
2340
16th to endDay
421242445%6%59%
2483
September1st to 15thDay
7%313423345%58%
2079
16th to endDay
9%5%13323347%54%
1838
October1st to 15thDay
13%9%35%5%245%5%6%38%
1682
16th to endDay
10%9%36%5%3445%6%38%
1708
November1st to 15thDay
12%13%5%6%424346%36%
1509
16th to endDay
7%14%6%10%5%3435%5%33%
1440
December1st to 15thDay
11%15%6%11%9%34345%22%
1440
16th to endDay
11%16%7%12%7%4433424%
1344
January1st to 15thNight
11%17%7%9%7%34435%24%
2613
16th to endNight
7%17%6%10%6%3434430%
2541
February1st to 15thNight
9%17%6%11%5%33345%28%
2277
16th to endNight
7%14%7%12%7%45%5%4425%
1977
March1st to 15thNight
8%15%5%8%5%34447%32%
2028
16th to endNight
9%15%47%5%2445%8%30%
2109
April1st to 15thNight
11%11%47%5%3446%7%33%
1802
16th to endNight
11%9%35%42436%8%40%
1620
May1st to 15thNight
6%8%25%4345%6%6%44%
1619
16th to endNight
13%8%36%436%6%7%8%31%
1504
June1st to 15thNight
14%6%25%4345%7%8%37%
1278
16th to endNight
5%213313447%60%
1260
July1st to 15thNight
312315%5%7%9%58%
1260
16th to endNight
21232335%6%66%
1619
August1st to 15thNight
41135%345%5%8%57%
1620
16th to endNight
4213313446%63%
1719
September1st to 15thNight
7%414423345%58%
1878
16th to endNight
8%41231345%6%57%
1847
October1st to 15thNight
11%8%24323347%48%
1947
16th to endNight
12%7%25%324447%46%
2161
November1st to 15thNight
12%12%46%434346%36%
2335
16th to endNight
7%14%5%8%5%44445%35%
2520
December1st to 15thNight
11%17%6%10%7%35%5%4423%
2520
16th to endNight
11%17%7%12%7%33335%23%
2877

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
9%18%7%11%8%35%5%3322%
1334
16th to endDay
6%20%6%10%7%25%34426%
1680
February1st to 15thDay
8%16%8%11%6%35%445%25%
1575
16th to endDay
6%18%10%14%8%3433422%
1494
March1st to 15thDay
7%14%6%10%7%45%45%7%26%
1932
16th to endDay
10%16%6%9%6%36%446%23%
2112
April1st to 15thDay
9%16%6%9%7%35%45%5%25%
2144
16th to endDay
9%14%410%6%35%446%29%
2340
May1st to 15thDay
9%9%48%7%36%5%46%36%
2331
16th to endDay
14%10%48%8%47%5%5%6%24%
2608
June1st to 15thDay
14%7%37%6%35%6%6%7%31%
2681
16th to endDay
33135%3446%7%54%
2700
July1st to 15thDay
32133345%6%8%56%
2700
16th to endDay
221342445%7%61%
2545
August1st to 15thDay
42134346%6%8%53%
2340
16th to endDay
321342446%7%59%
2483
September1st to 15thDay
7%323423446%57%
2079
16th to endDay
9%5%1432335%7%54%
1838
October1st to 15thDay
11%9%26%5%25%5%6%6%38%
1682
16th to endDay
10%9%36%5%3445%6%38%
1708
November1st to 15thDay
12%14%5%5%5%24345%35%
1509
16th to endDay
7%15%5%10%6%35%345%32%
1440
December1st to 15thDay
11%15%8%12%8%44445%20%
1440
16th to endDay
10%19%6%12%9%3433422%
1344
January1st to 15thNight
11%19%7%9%8%33435%24%
2613
16th to endNight
7%17%7%10%6%34345%29%
2541
February1st to 15thNight
9%17%7%12%6%33345%27%
2277
16th to endNight
8%14%7%11%9%445%4424%
1977
March1st to 15thNight
7%16%6%7%6%24446%32%
2028
16th to endNight
10%14%46%5%45%45%8%30%
2112
April1st to 15thNight
11%11%47%5%35%45%7%32%
1802
16th to endNight
10%9%35%43446%7%39%
1620
May1st to 15thNight
6%7%25%5%35%5%6%8%42%
1619
16th to endNight
12%8%36%5%36%5%7%8%30%
1503
June1st to 15thNight
13%6%25%5%35%5%6%7%38%
1278
16th to endNight
5%213423447%60%
1260
July1st to 15thNight
2123245%7%10%58%
1260
16th to endNight
211122435%8%65%
1619
August1st to 15thNight
3214435%5%5%9%56%
1620
16th to endNight
321332345%7%63%
1719
September1st to 15thNight
7%3235%23346%57%
1878
16th to endNight
7%5%1232345%6%57%
1847
October1st to 15thNight
10%8%24323347%48%
1947
16th to endNight
12%7%25%5%23447%45%
2161
November1st to 15thNight
12%12%46%5%2445%5%35%
2335
16th to endNight
8%13%5%7%6%34445%35%
2520
December1st to 15thNight
11%19%6%11%6%445%4421%
2520
16th to endNight
10%19%8%11%7%24335%22%
2877

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
66%5%10%12%31
1334
16th to endDay
61%413%13%6%1
1680
February1st to 15thDay
60%6%14%14%3
1575
16th to endDay
65%5%11%12%21
1494
March1st to 15thDay
57%7%16%13%3
1932
16th to endDay
60%6%14%14%2
2112
April1st to 15thDay
59%6%14%14%4
2144
16th to endDay
55%5%14%18%5%
2340
May1st to 15thDay
47%6%12%25%6%
2331
16th to endDay
58%7%13%15%4
2612
June1st to 15thDay
50%7%13%20%7%1
2681
16th to endDay
25%6%10%26%25%6%
2700
July1st to 15thDay
23%5%10%24%24%11%
2541
16th to endDay
20%48%16%30%20%
2387
August1st to 15thDay
24%6%8%21%28%10%
2325
16th to endDay
22%5%8%27%26%9%
2483
September1st to 15thDay
27%5%7%22%29%7%
2079
16th to endDay
29%415%28%17%4
1838
October1st to 15thDay
44%7%17%22%7%
1682
16th to endDay
45%6%19%22%5%
1708
November1st to 15thDay
51%6%16%17%5%2
1509
16th to endDay
53%8%18%14%5%
1440
December1st to 15thDay
66%6%11%12%2
1440
16th to endDay
66%5%12%10%31
1344
January1st to 15thNight
64%5%12%10%5%1
2613
16th to endNight
58%5%13%15%42
2541
February1st to 15thNight
60%5%13%13%5%
2288
16th to endNight
63%5%13%12%31
1977
March1st to 15thNight
52%7%17%17%5%1
2028
16th to endNight
51%8%16%17%4
2112
April1st to 15thNight
49%7%18%17%7%
1802
16th to endNight
42%5%17%28%6%
1620
May1st to 15thNight
36%9%15%29%9%
1620
16th to endNight
47%8%19%16%8%
1504
June1st to 15thNight
42%8%14%24%9%
1278
16th to endNight
23%5%9%28%24%8%
1260
July1st to 15thNight
18%6%13%28%21%12%
1190
16th to endNight
16%48%19%30%20%
1514
August1st to 15thNight
22%6%9%23%24%13%
1611
16th to endNight
19%5%9%23%29%13%
1719
September1st to 15thNight
27%48%23%26%9%
1878
16th to endNight
26%5%14%29%19%3
1847
October1st to 15thNight
36%5%18%27%10%
1947
16th to endNight
38%6%17%25%11%
2161
November1st to 15thNight
49%6%15%19%5%2
2335
16th to endNight
51%5%19%13%7%1
2520
December1st to 15thNight
66%6%13%10%2
2520
16th to endNight
66%311%12%31
2877

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
11%15%35%28%5%5%
60
16th to endDay
14%10%43%20%10%1
88
February1st to 15thDay
26%17%24%21%8%1
90
16th to endDay
20%24%35%15%3
153
March1st to 15thDay
24%33%30%9%2
270
16th to endDay
28%26%33%10%2
288
April1st to 15thDay
24%26%30%13%4
269
16th to endDay
24%28%30%11%4
270
May1st to 15thDay
17%23%32%19%6%1
288
16th to endDay
21%12%23%21%17%2
509
June1st to 15thDay
20%14%24%25%12%2
495
16th to endDay
7%16%27%29%16%2
495
July1st to 15thDay
6%10%24%33%21%1
475
16th to endDay
416%42%22%11%2
338
August1st to 15thDay
7%13%33%30%12%1
315
16th to endDay
5%13%33%28%12%4
332
September1st to 15thDay
11%16%34%21%13%2
315
16th to endDay
12%18%34%22%9%2
264
October1st to 15thDay
15%18%32%21%9%1
122
16th to endDay
34%9%25%20%7%3
96
November1st to 15thDay
15%6%28%22%21%5%
90
16th to endDay
13%22%41%17%5%
90
December1st to 15thDay
23%14%32%25%4
90
16th to endDay
28%10%31%15%12%1
64
January1st to 15thNight
20%8%31%25%12%
828
16th to endNight
15%8%29%33%11%1
768
February1st to 15thNight
19%7%32%29%9%
704
16th to endNight
14%10%34%30%9%
632
March1st to 15thNight
15%12%26%33%10%1
720
16th to endNight
19%10%26%32%10%
768
April1st to 15thNight
16%12%25%34%10%
608
16th to endNight
17%9%27%33%11%
540
May1st to 15thNight
12%10%24%30%19%1
540
16th to endNight
16%8%24%29%19%1
563
June1st to 15thNight
15%5%22%36%19%
378
16th to endNight
7%418%44%23%1
360
July1st to 15thNight
218%52%34%
340
16th to endNight
2315%45%30%3
497
August1st to 15thNight
4213%46%32%1
539
16th to endNight
5%316%42%29%2
573
September1st to 15thNight
9%117%39%28%3
627
16th to endNight
11%315%36%27%5%
667
October1st to 15thNight
15%5%21%38%17%1
660
16th to endNight
16%423%35%14%4
704
November1st to 15thNight
19%8%25%34%10%
760
16th to endNight
14%12%32%30%9%1
900
December1st to 15thNight
20%11%31%30%41
900
16th to endNight
19%13%30%25%10%
960
Page generated at 2017-09-19 05:32:27. Version ac04

Copyright 2017 A. Danko


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