Payson
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Payson 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
69%
15552
34%
46850
27%
15510
76%
15510
50%
22951

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
56%
720
30%
2327
24%
716
67%
716
41%
1157
January16th to endNight
56%
768
34%
2496
28%
768
69%
768
40%
1286
February1st to 15thNight
61%
702
33%
2223
27%
700
73%
700
46%
1086
February16th to endNight
55%
632
35%
1868
29%
632
66%
632
44%
983
March1st to 15thNight
59%
720
37%
1980
26%
720
70%
720
52%
995
March16th to endNight
66%
768
36%
2112
25%
768
76%
768
59%
1024
April1st to 15thNight
58%
683
31%
1942
18%
683
69%
683
51%
970
April16th to endNight
62%
540
42%
1716
29%
540
76%
540
61%
695
May1st to 15thNight
69%
539
37%
1619
27%
539
78%
539
62%
694
May16th to endNight
73%
561
37%
1684
28%
561
78%
561
67%
694
June1st to 15thNight
78%
540
33%
1620
29%
540
80%
540
69%
674
June16th to endNight
86%
540
33%
1620
31%
540
86%
540
71%
668
July1st to 15thNight
82%
510
19%
1530
17%
510
82%
510
41%
835
July16th to endNight
79%
564
18%
1593
15%
531
79%
531
33%
962
August1st to 15thNight
84%
539
26%
1611
22%
536
84%
536
41%
880
August16th to endNight
85%
592
30%
1831
29%
592
86%
592
40%
1015
September1st to 15thNight
82%
706
30%
1942
25%
706
83%
706
47%
1076
September16th to endNight
80%
656
40%
1815
30%
656
86%
656
64%
841
October1st to 15thNight
70%
660
39%
1911
29%
660
77%
660
59%
873
October16th to endNight
75%
704
40%
2112
33%
704
82%
704
61%
938
November1st to 15thNight
71%
700
39%
2122
30%
700
81%
700
60%
946
November16th to endNight
62%
720
38%
2340
32%
720
73%
720
49%
1082
December1st to 15thNight
63%
720
34%
2340
30%
720
72%
720
42%
1183
December16th to endNight
54%
768
31%
2496
26%
768
63%
768
33%
1394

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
4313323446%63%
47807
Night
4212213346%65%
47046
TransparencyDay
21%47%16%27%23%
47502
Night
19%37%16%28%24%
46852
SeeingDay
8%12%30%32%12%3
5376
Night
6%316%35%31%6%
15557

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
6%312323335%63%
1611
16th to endDay
10%412212236%61%
1728
February1st to 15thDay
46%24312237%60%
1638
16th to endDay
9%5%13314336%55%
1604
March1st to 15thDay
5%313222347%63%
1980
16th to endDay
3322223336%67%
2112
April1st to 15thDay
332323347%64%
2006
16th to endDay
3212212235%72%
2241
May1st to 15thDay
212212336%73%
2331
16th to endDay
212212235%74%
2429
June1st to 15thDay
111112235%78%
2340
16th to endDay
1212335%78%
2340
July1st to 15thDay
3313445%6%8%9%48%
2340
16th to endDay
5%326%5%47%7%9%9%36%
2467
August1st to 15thDay
43245%36%6%7%9%45%
2340
16th to endDay
3215%5%46%6%6%8%49%
2367
September1st to 15thDay
4313435%6%7%8%50%
1937
16th to endDay
322112335%74%
1815
October1st to 15thDay
211231334470%
1718
16th to endDay
2111112236%73%
1760
November1st to 15thDay
2212212435%69%
1735
16th to endDay
6%21222345%69%
1620
December1st to 15thDay
7%5%23313335%60%
1620
16th to endDay
11%6%24412345%53%
1728
January1st to 15thNight
6%31331333463%
2327
16th to endNight
9%312313435%61%
2496
February1st to 15thNight
5%5%12213235%65%
2212
16th to endNight
8%31122336%6%59%
1868
March1st to 15thNight
5%311212345%67%
1980
16th to endNight
3111212336%70%
2112
April1st to 15thNight
5%113212345%67%
1942
16th to endNight
11211123478%
1716
May1st to 15thNight
111113437%72%
1619
16th to endNight
21111222479%
1684
June1st to 15thNight
12112325%79%
1620
16th to endNight
111223479%
1620
July1st to 15thNight
2214435%7%6%10%52%
1620
16th to endNight
3224426%7%9%13%41%
1701
August1st to 15thNight
2214435%5%8%10%52%
1620
16th to endNight
2113436%5%7%8%53%
1831
September1st to 15thNight
33123245%6%9%57%
1942
16th to endNight
211113335%75%
1815
October1st to 15thNight
3113112225%73%
1911
16th to endNight
112212225%74%
2112
November1st to 15thNight
3111213335%71%
2122
16th to endNight
5%21221223470%
2340
December1st to 15thNight
8%312223445%61%
2340
16th to endNight
11%415%313345%55%
2496

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
24%36%16%29%19%
1612
16th to endDay
26%26%17%31%15%
1728
February1st to 15thDay
25%25%19%25%21%
1638
16th to endDay
29%3420%28%14%
1604
March1st to 15thDay
21%2415%36%19%
1980
16th to endDay
20%26%16%36%17%
2112
April1st to 15thDay
18%25%18%34%19%
2006
16th to endDay
15%2414%37%26%
2241
May1st to 15thDay
12%35%18%30%29%
2331
16th to endDay
13%25%12%34%30%
2432
June1st to 15thDay
10%238%28%47%
2340
16th to endDay
10%248%22%52%
2340
July1st to 15thDay
26%8%13%17%14%20%
2201
16th to endDay
36%13%17%18%12%2
2312
August1st to 15thDay
29%8%12%16%17%14%
2325
16th to endDay
29%7%12%19%21%9%
2367
September1st to 15thDay
27%7%11%15%21%16%
1937
16th to endDay
13%2412%36%30%
1815
October1st to 15thDay
16%45%15%27%32%
1718
16th to endDay
13%35%12%34%30%
1760
November1st to 15thDay
16%25%19%30%24%
1735
16th to endDay
19%2417%28%28%
1620
December1st to 15thDay
26%48%20%25%14%
1620
16th to endDay
33%36%21%24%9%
1728
January1st to 15thNight
24%37%17%30%17%
2327
16th to endNight
25%35%17%30%17%
2496
February1st to 15thNight
22%26%19%25%22%
2223
16th to endNight
24%35%19%29%16%
1868
March1st to 15thNight
19%2415%34%23%
1980
16th to endNight
15%26%18%39%16%
2112
April1st to 15thNight
19%25%17%33%21%
1942
16th to endNight
10%1413%37%30%
1716
May1st to 15thNight
11%36%17%31%30%
1620
16th to endNight
10%15%10%38%32%
1685
June1st to 15thNight
10%126%23%55%
1620
16th to endNight
10%135%18%59%
1620
July1st to 15thNight
24%7%14%14%16%22%
1530
16th to endNight
28%12%19%20%15%4
1593
August1st to 15thNight
23%8%13%20%16%17%
1611
16th to endNight
24%8%12%21%21%11%
1831
September1st to 15thNight
21%7%13%21%18%18%
1942
16th to endNight
13%2411%36%31%
1815
October1st to 15thNight
15%25%17%27%32%
1911
16th to endNight
13%26%12%27%37%
2112
November1st to 15thNight
15%25%20%32%24%
2122
16th to endNight
19%2414%27%30%
2340
December1st to 15thNight
23%47%19%26%18%
2340
16th to endNight
32%48%19%26%9%
2496

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
27%6%24%30%10%1
90
16th to endDay
15%13%17%31%16%5%
96
February1st to 15thDay
7%16%31%26%15%3
153
16th to endDay
17%27%31%16%5%
238
March1st to 15thDay
10%20%37%19%9%3
270
16th to endDay
8%24%34%21%8%2
288
April1st to 15thDay
9%22%39%16%8%2
269
16th to endDay
8%34%35%15%32
270
May1st to 15thDay
6%26%35%24%5%2
288
16th to endDay
320%41%24%7%2
330
June1st to 15thDay
315%44%25%8%3
315
16th to endDay
1238%38%13%4
315
July1st to 15thDay
6%226%46%15%2
305
16th to endDay
6%215%43%22%10%
327
August1st to 15thDay
6%214%47%23%5%
315
16th to endDay
4118%44%23%6%
332
September1st to 15thDay
6%229%42%14%4
300
16th to endDay
10%7%26%42%8%4
255
October1st to 15thDay
312%32%32%15%3
158
16th to endDay
10%428%37%17%2
96
November1st to 15thDay
10%226%35%20%5%
90
16th to endDay
10%16%28%35%8%
90
December1st to 15thDay
10%322%41%16%6%
90
16th to endDay
26%5%21%39%5%2
96
January1st to 15thNight
10%5%22%39%18%4
720
16th to endNight
11%5%22%37%19%2
768
February1st to 15thNight
9%420%42%20%2
704
16th to endNight
10%327%38%16%2
632
March1st to 15thNight
7%6%22%37%21%3
720
16th to endNight
4421%39%24%4
768
April1st to 15thNight
7%6%24%41%19%1
683
16th to endNight
29%23%38%22%4
540
May1st to 15thNight
25%19%43%25%3
540
16th to endNight
25%16%38%31%4
563
June1st to 15thNight
2114%43%34%2
540
16th to endNight
17%35%50%4
540
July1st to 15thNight
3325%58%9%
510
16th to endNight
4217%57%17%
564
August1st to 15thNight
2215%62%15%
539
16th to endNight
1219%57%18%
592
September1st to 15thNight
415%25%51%11%
706
16th to endNight
3110%32%39%12%
656
October1st to 15thNight
4318%38%29%5%
660
16th to endNight
2214%40%31%8%
704
November1st to 15thNight
4120%43%25%5%
700
16th to endNight
7%421%35%22%7%
720
December1st to 15thNight
11%318%40%24%1
720
16th to endNight
14%421%40%15%4
768
Page generated at 2017-09-13 04:39:11. Version ac04

Copyright 2017 A. Danko


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