Paint Mines Interpretive Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Paint Mines Interpretive Park clear sky chart from 2005-11-05 to

2017-09-12
.

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
52%
15892
27%
46807
18%
15849
60%
15849
40%
25771

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
49%
899
29%
2506
19%
895
58%
895
47%
1334
January16th to endNight
47%
822
34%
2550
21%
822
61%
822
46%
1276
February1st to 15thNight
41%
702
24%
2199
14%
700
53%
700
37%
1210
February16th to endNight
35%
632
33%
1894
15%
632
53%
632
43%
987
March1st to 15thNight
46%
720
27%
2151
16%
720
56%
720
44%
1146
March16th to endNight
43%
654
27%
1998
14%
654
56%
654
40%
1070
April1st to 15thNight
34%
539
23%
1798
12%
539
49%
539
35%
952
April16th to endNight
40%
540
20%
1800
17%
540
50%
540
28%
1078
May1st to 15thNight
46%
540
20%
1647
15%
540
54%
540
30%
1009
May16th to endNight
47%
562
17%
1503
9%
561
54%
561
34%
939
June1st to 15thNight
56%
540
20%
1440
12%
540
61%
540
43%
818
June16th to endNight
64%
540
23%
1440
17%
540
68%
540
45%
812
July1st to 15thNight
67%
510
16%
1360
14%
510
68%
510
33%
857
July16th to endNight
75%
564
21%
1424
19%
531
74%
531
36%
874
August1st to 15thNight
68%
539
15%
1716
16%
536
69%
536
27%
1061
August16th to endNight
71%
573
23%
1910
26%
573
73%
573
35%
1050
September1st to 15thNight
63%
530
25%
1766
24%
530
69%
530
34%
1001
September16th to endNight
70%
492
33%
1796
33%
492
77%
492
45%
812
October1st to 15thNight
50%
608
29%
1928
19%
608
58%
608
37%
1049
October16th to endNight
62%
751
35%
2159
22%
751
70%
751
53%
1072
November1st to 15thNight
58%
875
35%
2275
18%
875
66%
875
56%
1180
November16th to endNight
54%
900
36%
2340
21%
900
61%
900
53%
1238
December1st to 15thNight
44%
900
25%
2519
14%
900
52%
900
40%
1425
December16th to endNight
42%
960
28%
2688
14%
960
54%
960
39%
1521

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%42342445%8%53%
47866
Night
442442445%7%55%
46980
Cloud CoverDay
5%42342445%8%53%
47864
Night
442442445%7%55%
46980
TransparencyDay
27%5%12%24%21%8%
47541
Night
26%5%13%25%21%7%
46807
SeeingDay
9%7%28%28%18%6%
5816
Night
6%5%30%38%16%2
15896

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
342331335%7%62%
1432
16th to endDay
35%12312246%64%
1683
February1st to 15thDay
36%25%423447%55%
1662
16th to endDay
15%35%4335%35%58%
1580
March1st to 15thDay
36%2332346%6%57%
1806
16th to endDay
5%6%2442345%9%50%
2225
April1st to 15thDay
6%6%13325%45%7%52%
2150
16th to endDay
10%8%2442445%7%45%
2160
May1st to 15thDay
10%5%25%5%35%5%6%8%40%
2304
16th to endDay
7%4135%346%7%8%46%
2608
June1st to 15thDay
6%3133245%7%9%51%
2520
16th to endDay
31123245%7%10%55%
2520
July1st to 15thDay
6%3145%35%6%7%11%44%
2520
16th to endDay
5%3145%46%6%7%9%45%
2646
August1st to 15thDay
6%3145%35%7%7%10%43%
2232
16th to endDay
5%3134345%6%8%51%
2292
September1st to 15thDay
5%31333445%8%53%
2113
16th to endDay
321332335%6%65%
1834
October1st to 15thDay
7%313222247%62%
1700
16th to endDay
5%313212346%67%
1700
November1st to 15thDay
2413423447%61%
1583
16th to endDay
2312212246%68%
1620
December1st to 15thDay
35%2433445%6%57%
1440
16th to endDay
47%34322447%55%
1536
January1st to 15thNight
1423423347%61%
2506
16th to endNight
2424323345%64%
2550
February1st to 15thNight
25%25%5%1345%6%55%
2189
16th to endNight
25%35%323345%59%
1894
March1st to 15thNight
35%1432345%7%57%
2151
16th to endNight
5%42232445%8%56%
1998
April1st to 15thNight
5%6%2342445%7%53%
1798
16th to endNight
10%7%35%33445%7%46%
1800
May1st to 15thNight
9%7%244245%7%8%43%
1646
16th to endNight
7%5%34325%45%9%48%
1502
June1st to 15thNight
4213425%5%6%11%53%
1440
16th to endNight
33144245%6%8%55%
1440
July1st to 15thNight
6%215%5%46%7%7%9%43%
1440
16th to endNight
5%324435%6%8%10%45%
1520
August1st to 15thNight
6%5%345%35%6%7%9%42%
1725
16th to endNight
7%3244246%6%10%47%
1910
September1st to 15thNight
7%315%42446%8%49%
1766
16th to endNight
3212323446%64%
1796
October1st to 15thNight
7%414323446%57%
1928
16th to endNight
4212212347%65%
2159
November1st to 15thNight
221231245%6%66%
2275
16th to endNight
2414312245%66%
2340
December1st to 15thNight
25%25%42445%7%55%
2519
16th to endNight
36%34324346%56%
2688

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
342331245%7%61%
1432
16th to endDay
35%12222246%64%
1683
February1st to 15thDay
26%345%23447%55%
1662
16th to endDay
15%344335%36%58%
1580
March1st to 15thDay
36%3332345%6%57%
1806
16th to endDay
5%7%2442435%9%50%
2223
April1st to 15thDay
6%6%23325%45%7%52%
2150
16th to endDay
10%9%25%42435%7%45%
2160
May1st to 15thDay
10%7%25%5%35%5%5%8%39%
2304
16th to endDay
7%424435%5%7%9%46%
2608
June1st to 15thDay
6%313325%5%6%9%51%
2520
16th to endDay
3112325%5%6%10%55%
2520
July1st to 15thDay
5%4145%35%6%7%10%44%
2520
16th to endDay
5%3145%36%6%8%9%45%
2646
August1st to 15thDay
6%3145%35%7%7%10%43%
2232
16th to endDay
5%313435%5%6%8%51%
2292
September1st to 15thDay
5%31343445%8%54%
2113
16th to endDay
321322335%6%65%
1834
October1st to 15thDay
7%312222247%62%
1700
16th to endDay
5%213112345%67%
1700
November1st to 15thDay
2423323447%61%
1583
16th to endDay
2312213346%67%
1620
December1st to 15thDay
35%2432445%6%58%
1440
16th to endDay
47%35%323447%54%
1536
January1st to 15thNight
1422423347%61%
2506
16th to endNight
2424313345%64%
2550
February1st to 15thNight
26%35%42345%6%55%
2189
16th to endNight
25%35%42345%6%59%
1894
March1st to 15thNight
35%1442345%7%57%
2151
16th to endNight
5%41332436%8%56%
1998
April1st to 15thNight
5%6%243245%5%7%53%
1798
16th to endNight
10%8%25%42445%7%45%
1800
May1st to 15thNight
9%7%344245%7%8%43%
1646
16th to endNight
7%434325%5%5%8%48%
1502
June1st to 15thNight
3214315%5%7%10%53%
1440
16th to endNight
231432447%9%54%
1440
July1st to 15thNight
6%3146%37%7%6%9%43%
1440
16th to endNight
5%314435%6%8%11%44%
1520
August1st to 15thNight
5%426%5%35%6%7%10%41%
1725
16th to endNight
6%3235%25%6%6%11%47%
1910
September1st to 15thNight
7%415%4245%5%9%48%
1766
16th to endNight
4212323446%64%
1796
October1st to 15thNight
7%413323446%57%
1928
16th to endNight
4312212437%65%
2159
November1st to 15thNight
221231235%6%66%
2275
16th to endNight
2424312245%66%
2340
December1st to 15thNight
25%245%2435%7%55%
2519
16th to endNight
26%24325%346%56%
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
21%311%30%26%6%
1433
16th to endDay
21%310%30%24%9%
1683
February1st to 15thDay
28%412%32%16%6%
1663
16th to endDay
27%36%28%25%8%
1580
March1st to 15thDay
26%411%24%24%8%
1806
16th to endDay
30%413%24%21%5%
2225
April1st to 15thDay
29%5%12%25%20%7%
2150
16th to endDay
36%5%13%23%16%5%
2160
May1st to 15thDay
39%6%13%22%16%2
2304
16th to endDay
31%9%16%22%14%6%
2612
June1st to 15thDay
26%6%14%22%18%11%
2520
16th to endDay
19%6%11%23%25%12%
2520
July1st to 15thDay
30%8%13%20%16%10%
2371
16th to endDay
29%10%14%23%17%5%
2479
August1st to 15thDay
30%9%15%20%14%8%
2217
16th to endDay
26%6%12%25%23%6%
2292
September1st to 15thDay
26%5%12%22%21%11%
2113
16th to endDay
18%38%23%35%10%
1834
October1st to 15thDay
22%311%21%32%8%
1700
16th to endDay
19%27%27%31%11%
1700
November1st to 15thDay
21%310%23%25%15%
1583
16th to endDay
16%28%25%32%13%
1620
December1st to 15thDay
26%412%29%21%4
1440
16th to endDay
30%313%27%17%7%
1536
January1st to 15thNight
22%412%29%25%6%
2506
16th to endNight
22%39%29%25%8%
2550
February1st to 15thNight
28%5%13%30%17%4
2199
16th to endNight
24%310%30%22%9%
1894
March1st to 15thNight
24%311%25%27%6%
2151
16th to endNight
25%5%14%23%26%5%
1998
April1st to 15thNight
27%413%26%19%7%
1798
16th to endNight
36%5%13%25%14%5%
1800
May1st to 15thNight
35%6%15%23%14%4
1647
16th to endNight
31%8%19%20%12%7%
1503
June1st to 15thNight
23%7%20%22%14%11%
1440
16th to endNight
24%5%13%24%20%11%
1440
July1st to 15thNight
32%9%16%21%13%6%
1360
16th to endNight
29%9%17%23%17%2
1424
August1st to 15thNight
33%11%16%21%10%6%
1716
16th to endNight
28%6%15%26%17%5%
1910
September1st to 15thNight
30%6%12%22%18%9%
1766
16th to endNight
19%5%10%27%29%8%
1796
October1st to 15thNight
27%5%10%19%28%7%
1928
16th to endNight
18%39%26%28%12%
2159
November1st to 15thNight
17%311%25%26%15%
2275
16th to endNight
20%29%25%30%12%
2340
December1st to 15thNight
27%5%13%28%20%5%
2519
16th to endNight
27%5%15%24%22%4
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
14%7%20%36%16%4
90
16th to endDay
10%9%27%37%13%2
96
February1st to 15thDay
5%11%53%26%3
90
16th to endDay
11%46%25%12%3
81
March1st to 15thDay
212%31%35%17%1
96
16th to endDay
13%18%44%14%6%1
288
April1st to 15thDay
11%18%40%18%8%2
269
16th to endDay
22%21%32%19%2
270
May1st to 15thDay
14%12%30%25%13%3
441
16th to endDay
12%10%30%24%16%5%
517
June1st to 15thDay
8%7%27%29%20%6%
495
16th to endDay
4425%32%24%7%
495
July1st to 15thDay
8%117%34%28%9%
475
16th to endDay
8%113%29%32%13%
505
August1st to 15thDay
9%225%37%19%5%
315
16th to endDay
5%322%41%21%6%
332
September1st to 15thDay
6%237%28%17%7%
300
16th to endDay
3431%20%27%12%
109
October1st to 15thDay
7%5%24%28%20%13%
90
16th to endDay
7%5%28%23%25%10%
96
November1st to 15thDay
2426%30%32%4
90
16th to endDay
5%13%42%26%11%1
90
December1st to 15thDay
5%10%52%26%5%
90
16th to endDay
9%6%31%40%12%
96
January1st to 15thNight
35%35%38%13%4
900
16th to endNight
3440%37%11%2
822
February1st to 15thNight
5%6%42%36%7%
704
16th to endNight
48%47%30%8%
632
March1st to 15thNight
5%5%39%35%11%2
720
16th to endNight
6%7%39%35%10%
654
April1st to 15thNight
8%10%43%29%7%
539
16th to endNight
16%10%29%33%9%1
540
May1st to 15thNight
11%8%28%36%13%
540
16th to endNight
8%6%33%35%14%1
563
June1st to 15thNight
4330%44%15%1
540
16th to endNight
4221%47%22%1
540
July1st to 15thNight
7%13%43%31%3
510
16th to endNight
6%17%42%38%3
564
August1st to 15thNight
7%111%44%31%3
539
16th to endNight
8%19%44%32%3
573
September1st to 15thNight
8%119%41%24%4
530
16th to endNight
3217%46%24%5%
492
October1st to 15thNight
8%6%30%31%17%4
608
16th to endNight
5%423%39%21%5%
751
November1st to 15thNight
3429%40%19%2
875
16th to endNight
5%5%31%39%14%3
900
December1st to 15thNight
46%38%39%9%2
900
16th to endNight
6%7%37%36%10%2
960
Page generated at 2017-09-13 05:39:19. Version ac04

Copyright 2017 A. Danko


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