Pumpjack Heaven
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pumpjack Heaven clear sky chart from 2005-11-05 to 2019-06-24.

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%
17872
33%
54073
20%
17830
64%
17830
47%
27201

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
44%
992
35%
2661
16%
989
57%
989
46%
1466
January16th to endNight
46%
896
40%
2688
21%
896
63%
896
49%
1298
February1st to 15thNight
41%
821
35%
2467
16%
818
58%
818
45%
1254
February16th to endNight
27%
736
33%
2206
9%
736
47%
736
41%
1137
March1st to 15thNight
33%
840
31%
2520
12%
840
49%
840
37%
1378
March16th to endNight
31%
672
33%
2380
16%
672
54%
672
43%
1096
April1st to 15thNight
28%
629
37%
2098
15%
629
55%
629
43%
987
April16th to endNight
29%
624
34%
2079
15%
624
55%
624
47%
944
May1st to 15thNight
35%
630
29%
1982
17%
630
54%
630
43%
1005
May16th to endNight
43%
657
28%
1972
16%
657
61%
657
46%
1008
June1st to 15thNight
54%
630
28%
1890
22%
630
65%
630
57%
876
June16th to endNight
67%
609
26%
1827
22%
609
73%
609
57%
864
July1st to 15thNight
79%
555
24%
1665
25%
555
81%
555
50%
846
July16th to endNight
86%
612
29%
1859
34%
579
89%
579
53%
867
August1st to 15thNight
86%
575
32%
1908
39%
572
88%
572
51%
879
August16th to endNight
82%
621
28%
2070
33%
621
84%
621
44%
1033
September1st to 15thNight
76%
585
27%
2034
31%
585
78%
585
38%
1076
September16th to endNight
67%
582
30%
2145
30%
582
72%
582
36%
1101
October1st to 15thNight
61%
585
35%
2145
31%
585
70%
585
43%
992
October16th to endNight
61%
776
40%
2440
24%
776
73%
776
54%
1136
November1st to 15thNight
55%
1025
36%
2665
15%
1025
66%
1025
55%
1389
November16th to endNight
54%
1050
38%
2730
17%
1050
65%
1050
54%
1431
December1st to 15thNight
46%
1050
38%
2730
18%
1050
58%
1050
48%
1508
December16th to endNight
43%
1120
35%
2912
15%
1120
55%
1120
45%
1630

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
6%313323347%60%
54726
Night
5%31332345%7%61%
54285
Cloud CoverDay
6%313323346%60%
54724
Night
5%21332345%7%61%
54285
TransparencyDay
24%28%22%25%16%
54435
Night
22%38%21%25%17%
54079
SeeingDay
7%422%35%23%6%
7727
Night
6%432%39%15%1
17879

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
9%413312236%59%
1949
16th to endDay
7%312213346%64%
2240
February1st to 15thDay
4312223447%61%
2050
16th to endDay
7%422313336%61%
1840
March1st to 15thDay
7%5%2431345%5%56%
2100
16th to endDay
5%312312346%63%
2544
April1st to 15thDay
5%213213446%65%
2510
16th to endDay
5%31213236%67%
2486
May1st to 15thDay
7%313323447%58%
2627
16th to endDay
6%21322435%7%59%
2846
June1st to 15thDay
212213448%67%
2730
16th to endDay
4212424449%59%
2640
July1st to 15thDay
5%3145%345%6%8%50%
2535
16th to endDay
2213435%45%8%58%
2539
August1st to 15thDay
221232435%8%63%
2294
16th to endDay
42146%35%5%7%9%48%
2484
September1st to 15thDay
10%5%25%5%2345%8%46%
2256
16th to endDay
10%415%5%33446%51%
2145
October1st to 15thDay
7%414322236%60%
2145
16th to endDay
6%31221222470%
2117
November1st to 15thDay
5%313211236%67%
1853
16th to endDay
7%21221232468%
1890
December1st to 15thDay
9%5%13223436%57%
1890
16th to endDay
5%424313336%59%
2016
January1st to 15thNight
7%423323345%60%
2661
16th to endNight
6%312212346%65%
2688
February1st to 15thNight
5%313323346%62%
2462
16th to endNight
5%313414346%61%
2206
March1st to 15thNight
6%5%24323346%57%
2520
16th to endNight
421332335%8%62%
2380
April1st to 15thNight
5%31222335%7%63%
2098
16th to endNight
3212212345%68%
2079
May1st to 15thNight
431332445%7%60%
1981
16th to endNight
5%21222346%9%59%
1971
June1st to 15thNight
21131346%9%64%
1890
16th to endNight
1122245%6%10%62%
1827
July1st to 15thNight
31133245%7%10%55%
1755
16th to endNight
212325%45%10%61%
1977
August1st to 15thNight
2123145%5%7%62%
1919
16th to endNight
32123345%7%13%52%
2070
September1st to 15thNight
7%21342435%11%51%
2034
16th to endNight
10%4133135%6%8%52%
2145
October1st to 15thNight
6%21222335%7%61%
2145
16th to endNight
5%31221223471%
2440
November1st to 15thNight
422212346%66%
2665
16th to endNight
5%21231224467%
2730
December1st to 15thNight
7%41321335%6%59%
2730
16th to endNight
7%413223446%59%
2912

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
9%413222236%59%
1949
16th to endDay
7%212122346%64%
2240
February1st to 15thDay
431221345%7%62%
2050
16th to endDay
6%5%12313335%62%
1840
March1st to 15thDay
7%5%14313445%55%
2100
16th to endDay
5%322312346%63%
2542
April1st to 15thDay
5%212223346%65%
2510
16th to endDay
5%311112336%68%
2486
May1st to 15thDay
7%313313447%59%
2627
16th to endDay
6%21322335%7%60%
2846
June1st to 15thDay
312213448%67%
2730
16th to endDay
422324448%60%
2640
July1st to 15thDay
5%3144346%6%7%51%
2535
16th to endDay
2213425%5%5%8%57%
2539
August1st to 15thDay
221342345%7%63%
2294
16th to endDay
5%2135%36%6%6%9%49%
2484
September1st to 15thDay
10%425%4335%5%7%46%
2256
16th to endDay
10%415%5%24446%51%
2145
October1st to 15thDay
8%314322246%60%
2145
16th to endDay
6%31221122470%
2117
November1st to 15thDay
5%312212236%68%
1853
16th to endDay
7%21221222468%
1890
December1st to 15thDay
9%5%13223445%57%
1890
16th to endDay
5%424313345%59%
2016
January1st to 15thNight
7%323313345%60%
2661
16th to endNight
6%212212346%65%
2688
February1st to 15thNight
5%314222346%62%
2462
16th to endNight
6%313323346%61%
2206
March1st to 15thNight
6%5%14422346%57%
2520
16th to endNight
421331335%7%62%
2380
April1st to 15thNight
5%31231235%7%63%
2098
16th to endNight
3212212345%68%
2079
May1st to 15thNight
5%21332345%7%60%
1981
16th to endNight
5%21222346%9%59%
1971
June1st to 15thNight
21122446%8%65%
1890
16th to endNight
1122235%6%10%63%
1827
July1st to 15thNight
31133146%6%11%55%
1755
16th to endNight
21233445%10%61%
1977
August1st to 15thNight
31122235%5%7%63%
1919
16th to endNight
42123245%7%13%53%
2070
September1st to 15thNight
8%21442445%10%51%
2034
16th to endNight
10%4133135%6%8%52%
2145
October1st to 15thNight
6%212313447%62%
2145
16th to endNight
5%31221223471%
2440
November1st to 15thNight
422312336%67%
2665
16th to endNight
5%212212345%67%
2730
December1st to 15thNight
7%41321335%6%60%
2730
16th to endNight
6%423213346%59%
2912

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
27%1424%26%14%
1950
16th to endDay
22%2416%35%19%
2240
February1st to 15thDay
21%27%18%24%25%
2051
16th to endDay
25%2216%28%24%
1840
March1st to 15thDay
29%2317%28%18%
2100
16th to endDay
22%26%20%23%24%
2544
April1st to 15thDay
20%26%14%27%27%
2510
16th to endDay
19%15%18%25%28%
2486
May1st to 15thDay
25%36%18%23%21%
2627
16th to endDay
24%47%19%26%18%
2850
June1st to 15thDay
16%39%28%28%13%
2730
16th to endDay
22%410%25%23%13%
2640
July1st to 15thDay
28%415%29%17%3
2396
16th to endDay
21%315%33%22%3
2394
August1st to 15thDay
19%313%32%27%3
2281
16th to endDay
29%416%27%18%3
2484
September1st to 15thDay
36%411%24%18%5%
2256
16th to endDay
34%35%19%26%10%
2145
October1st to 15thDay
27%38%25%20%15%
2145
16th to endDay
21%1414%33%25%
2117
November1st to 15thDay
19%16%27%24%20%
1853
16th to endDay
21%15%16%31%23%
1890
December1st to 15thDay
29%15%19%29%14%
1890
16th to endDay
27%2421%32%11%
2016
January1st to 15thNight
26%1417%30%18%
2661
16th to endNight
20%1318%29%26%
2688
February1st to 15thNight
23%26%15%24%26%
2472
16th to endNight
25%2413%29%25%
2206
March1st to 15thNight
29%2416%23%22%
2520
16th to endNight
21%38%22%23%20%
2380
April1st to 15thNight
21%37%18%24%24%
2098
16th to endNight
18%28%21%25%23%
2079
May1st to 15thNight
23%310%21%22%17%
1982
16th to endNight
21%413%22%23%14%
1973
June1st to 15thNight
14%412%31%26%9%
1890
16th to endNight
16%316%26%24%12%
1827
July1st to 15thNight
21%317%35%17%4
1665
16th to endNight
17%414%31%27%4
1859
August1st to 15thNight
18%411%29%28%7%
1908
16th to endNight
22%5%15%31%19%5%
2070
September1st to 15thNight
28%415%24%21%6%
2034
16th to endNight
28%39%22%23%11%
2145
October1st to 15thNight
22%312%25%21%15%
2145
16th to endNight
18%2416%31%26%
2440
November1st to 15thNight
19%25%25%27%19%
2665
16th to endNight
21%1413%30%28%
2730
December1st to 15thNight
25%25%20%26%19%
2730
16th to endNight
26%1419%30%17%
2912

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
16%227%33%16%2
180
16th to endDay
6%8%38%29%15%2
192
February1st to 15thDay
10%334%31%18%2
180
16th to endDay
10%10%38%30%10%
159
March1st to 15thDay
14%143%30%10%
180
16th to endDay
27%38%39%10%1
272
April1st to 15thDay
7%12%39%30%10%
389
16th to endDay
7%11%37%32%9%1
378
May1st to 15thDay
7%7%40%33%8%2
524
16th to endDay
7%435%39%11%1
677
June1st to 15thDay
4121%49%20%3
645
16th to endDay
3114%40%32%6%
611
July1st to 15thDay
5%342%37%10%
550
16th to endDay
2334%40%18%
460
August1st to 15thDay
3230%48%14%
359
16th to endDay
45%32%44%12%
396
September1st to 15thDay
8%1326%43%16%
291
16th to endDay
17%8%27%31%15%
180
October1st to 15thDay
11%13%38%33%2
180
16th to endDay
15%217%28%23%13%
192
November1st to 15thDay
15%223%37%15%5%
180
16th to endDay
13%10%23%25%17%8%
180
December1st to 15thDay
17%6%23%36%13%2
180
16th to endDay
7%8%42%30%10%
192
January1st to 15thNight
8%437%38%10%
994
16th to endNight
8%6%36%38%9%
896
February1st to 15thNight
7%5%41%35%8%
824
16th to endNight
8%10%51%25%3
736
March1st to 15thNight
10%9%43%30%5%
840
16th to endNight
5%10%50%29%4
672
April1st to 15thNight
6%10%53%26%3
629
16th to endNight
410%53%28%3
624
May1st to 15thNight
46%50%32%5%
630
16th to endNight
5%342%38%8%
659
June1st to 15thNight
2138%48%8%
630
16th to endNight
1125%53%18%
609
July1st to 15thNight
38%55%28%3
555
16th to endNight
15%55%35%
612
August1st to 15thNight
2345%45%2
575
16th to endNight
415%42%42%3
621
September1st to 15thNight
8%6%46%35%2
585
16th to endNight
10%13%50%24%1
582
October1st to 15thNight
7%225%48%16%1
585
16th to endNight
6%325%42%21%1
776
November1st to 15thNight
6%429%41%16%1
1025
16th to endNight
6%430%41%15%1
1050
December1st to 15thNight
11%433%39%10%1
1050
16th to endNight
9%7%34%36%10%
1120
Page generated at 2019-06-24 19:41:27. Version ac04

Copyright 2019 A. Danko


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