Poplar Point
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Poplar Point clear sky chart from 2005-11-05 to 2017-09-22.

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
39%
16310
12%
46850
8%
16268
43%
16268
21%
33051

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
32%
899
10%
2685
7%
895
36%
895
14%
2054
January16th to endNight
28%
960
9%
2729
4%
960
33%
960
12%
2191
February1st to 15thNight
38%
875
11%
2369
5%
875
41%
875
20%
1722
February16th to endNight
40%
732
14%
1994
8%
732
44%
732
20%
1443
March1st to 15thNight
35%
651
13%
2091
8%
651
40%
651
18%
1473
March16th to endNight
41%
576
14%
2112
12%
576
48%
576
18%
1421
April1st to 15thNight
42%
539
17%
1705
16%
539
48%
539
25%
1070
April16th to endNight
43%
540
15%
1620
11%
540
47%
540
23%
1097
May1st to 15thNight
38%
540
12%
1472
4%
540
41%
540
24%
1009
May16th to endNight
42%
563
11%
1311
6%
561
44%
561
30%
916
June1st to 15thNight
42%
540
4%
1260
3%
540
43%
540
31%
881
June16th to endNight
53%
540
3%
1260
3%
540
54%
540
36%
841
July1st to 15thNight
60%
510
6%
1190
4%
510
62%
510
46%
724
July16th to endNight
62%
564
13%
1276
7%
531
65%
531
48%
766
August1st to 15thNight
58%
539
16%
1519
8%
536
62%
536
36%
910
August16th to endNight
58%
573
21%
1719
19%
573
63%
573
41%
935
September1st to 15thNight
55%
540
17%
1815
17%
540
62%
540
34%
1000
September16th to endNight
45%
513
19%
1891
18%
513
52%
513
24%
1136
October1st to 15thNight
30%
612
15%
1932
9%
612
35%
612
17%
1362
October16th to endNight
35%
869
13%
2277
6%
869
38%
869
21%
1685
November1st to 15thNight
31%
875
12%
2418
5%
875
36%
875
18%
1811
November16th to endNight
26%
900
10%
2625
6%
900
30%
900
13%
2059
December1st to 15thNight
30%
900
7%
2700
4%
900
33%
900
12%
2151
December16th to endNight
22%
960
8%
2880
4%
960
26%
960
9%
2394

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
13%8%36%6%35%5%5%7%34%
48067
Night
11%9%47%6%35%5%5%6%33%
46999
Cloud CoverDay
13%8%36%6%35%5%5%7%34%
48077
Night
11%9%47%6%35%5%5%6%33%
47002
Cloud CoverDay
12%8%37%6%35%5%5%7%33%
48078
Night
11%9%47%6%35%5%5%6%32%
47003
Cloud CoverDay
13%8%47%6%35%5%5%7%33%
48076
Night
11%9%48%6%35%5%5%6%32%
47003
TransparencyDay
48%415%23%7%
47733
Night
50%414%22%8%
46850
SeeingDay
16%6%26%28%17%4
6296
Night
16%5%26%34%15%1
16316

By Month

Percentage Cloud Cover NE (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%12%6%9%8%46%6%6%7%22%
1253
16th to endDay
11%14%7%9%7%47%7%6%5%17%
1494
February1st to 15thDay
8%9%49%9%5%7%7%5%7%24%
1494
16th to endDay
10%11%411%8%5%8%6%6%6%19%
1491
March1st to 15thDay
10%12%7%10%8%45%5%5%6%22%
1858
16th to endDay
12%12%37%7%46%5%6%7%25%
2112
April1st to 15thDay
12%9%5%6%5%24347%38%
2243
16th to endDay
13%7%36%5%35%5%5%7%36%
2340
May1st to 15thDay
19%9%25%433446%36%
2478
16th to endDay
21%5%3442445%6%37%
2803
June1st to 15thDay
16%6%26%6%35%5%6%7%33%
2700
16th to endDay
15%425%5%35%5%6%9%35%
2700
July1st to 15thDay
10%32443446%8%45%
2700
16th to endDay
9%3134345%6%9%48%
2803
August1st to 15thDay
11%414436%5%5%7%44%
2432
16th to endDay
11%314424448%50%
2483
September1st to 15thDay
11%5%25%5%3345%7%45%
2145
16th to endDay
15%6%24423448%42%
1881
October1st to 15thDay
16%10%37%6%34345%32%
1686
16th to endDay
17%12%37%6%3445%6%27%
1592
November1st to 15thDay
14%13%6%8%5%23445%30%
1440
16th to endDay
14%12%7%11%9%35%445%21%
1335
December1st to 15thDay
8%15%7%11%9%47%6%6%6%15%
1260
16th to endDay
13%15%6%13%8%46%446%17%
1344
January1st to 15thNight
8%13%5%8%8%5%7%7%6%6%22%
2685
16th to endNight
10%13%7%10%8%47%7%5%6%18%
2729
February1st to 15thNight
8%11%38%7%37%7%6%7%28%
2366
16th to endNight
9%9%5%10%6%46%45%8%28%
1994
March1st to 15thNight
11%10%5%8%6%35%346%33%
2079
16th to endNight
13%10%36%5%25%5%5%7%33%
2112
April1st to 15thNight
9%7%35%5%35%5%6%6%41%
1705
16th to endNight
12%9%37%5%345%46%37%
1620
May1st to 15thNight
17%8%35%5%245%5%5%36%
1472
16th to endNight
18%434424446%41%
1310
June1st to 15thNight
14%6%245%35%45%7%39%
1260
16th to endNight
11%5%235%25%36%9%44%
1260
July1st to 15thNight
8%213325%45%10%52%
1260
16th to endNight
431332446%9%54%
1363
August1st to 15thNight
7%3246%345%5%7%49%
1527
16th to endNight
8%31441335%8%55%
1719
September1st to 15thNight
8%5%1442345%7%50%
1815
16th to endNight
14%5%345%2345%6%44%
1891
October1st to 15thNight
18%9%35%6%34436%31%
1932
16th to endNight
16%10%37%5%2445%5%32%
2277
November1st to 15thNight
13%13%5%8%5%24445%31%
2418
16th to endNight
12%11%7%12%8%35%5%46%23%
2625
December1st to 15thNight
9%14%7%12%8%47%6%5%5%19%
2700
16th to endNight
14%15%7%12%9%46%445%15%
2880

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
9%12%6%9%8%5%5%6%6%7%21%
1254
16th to endDay
11%14%7%9%8%47%6%6%6%17%
1494
February1st to 15thDay
8%9%49%9%5%7%6%6%7%24%
1494
16th to endDay
10%11%5%10%9%48%7%6%6%19%
1491
March1st to 15thDay
10%12%6%10%8%45%5%5%6%22%
1869
16th to endDay
12%12%47%7%46%5%6%6%26%
2110
April1st to 15thDay
12%9%47%423447%38%
2243
16th to endDay
13%7%36%5%3445%6%37%
2340
May1st to 15thDay
19%8%34433435%37%
2478
16th to endDay
21%6%2443435%6%37%
2803
June1st to 15thDay
16%6%26%6%35%5%6%7%33%
2700
16th to endDay
14%5%35%5%35%5%6%9%35%
2700
July1st to 15thDay
10%424435%47%9%45%
2700
16th to endDay
8%3134345%6%9%48%
2803
August1st to 15thDay
10%425%435%6%5%8%44%
2432
16th to endDay
10%41432445%7%50%
2483
September1st to 15thDay
12%5%25%5%2445%8%44%
2145
16th to endDay
15%6%24424348%43%
1881
October1st to 15thDay
16%11%37%7%33346%31%
1686
16th to endDay
17%13%36%6%35%5%5%6%26%
1592
November1st to 15thDay
14%13%7%7%6%23445%29%
1440
16th to endDay
14%13%6%12%8%34445%20%
1335
December1st to 15thDay
8%15%8%10%10%37%6%5%7%15%
1260
16th to endDay
13%14%7%13%7%46%446%17%
1344
January1st to 15thNight
9%13%5%9%9%46%7%7%6%21%
2685
16th to endNight
10%13%7%10%8%47%6%5%6%18%
2729
February1st to 15thNight
8%11%48%6%37%7%6%7%28%
2359
16th to endNight
8%9%5%10%7%46%45%8%29%
1994
March1st to 15thNight
11%10%5%8%6%45%336%33%
2091
16th to endNight
13%10%46%5%25%46%6%33%
2110
April1st to 15thNight
9%7%35%5%36%5%5%6%41%
1705
16th to endNight
12%9%37%5%44446%37%
1620
May1st to 15thNight
15%8%35%5%245%5%5%36%
1471
16th to endNight
18%5%3432445%6%40%
1311
June1st to 15thNight
14%5%25%5%35%46%7%39%
1260
16th to endNight
11%425%4235%5%10%43%
1260
July1st to 15thNight
8%2332446%11%51%
1260
16th to endNight
44133235%6%9%54%
1363
August1st to 15thNight
6%4246%35%45%7%48%
1527
16th to endNight
8%31441335%8%54%
1719
September1st to 15thNight
9%5%1442346%7%50%
1815
16th to endNight
14%5%25%42345%6%43%
1891
October1st to 15thNight
18%10%36%6%35%446%31%
1932
16th to endNight
16%11%36%5%3445%5%31%
2277
November1st to 15thNight
13%13%6%6%5%345%45%30%
2418
16th to endNight
12%11%7%12%8%35%5%5%5%22%
2625
December1st to 15thNight
8%14%8%12%8%46%6%5%6%18%
2700
16th to endNight
14%15%7%11%9%46%445%15%
2880

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%12%6%9%8%5%6%6%6%7%21%
1253
16th to endDay
11%14%7%9%8%47%7%6%6%16%
1494
February1st to 15thDay
7%10%410%9%5%7%6%6%7%24%
1494
16th to endDay
10%11%411%8%5%9%7%6%6%18%
1491
March1st to 15thDay
10%12%6%10%7%5%5%5%5%6%22%
1869
16th to endDay
12%11%47%7%46%5%6%6%26%
2112
April1st to 15thDay
12%9%5%7%5%24346%38%
2243
16th to endDay
13%7%36%5%35%45%6%37%
2340
May1st to 15thDay
18%9%35%423446%37%
2478
16th to endDay
20%6%2442445%6%36%
2803
June1st to 15thDay
15%6%37%6%35%5%6%7%32%
2700
16th to endDay
14%5%35%5%45%5%6%8%34%
2700
July1st to 15thDay
10%42443447%8%45%
2700
16th to endDay
8%31343447%9%47%
2803
August1st to 15thDay
10%425%435%5%6%8%43%
2432
16th to endDay
10%41442445%7%49%
2483
September1st to 15thDay
11%5%26%43345%8%44%
2145
16th to endDay
15%6%24424448%42%
1881
October1st to 15thDay
15%11%38%7%33446%30%
1686
16th to endDay
17%12%36%6%35%5%46%26%
1592
November1st to 15thDay
14%12%7%9%5%33345%29%
1440
16th to endDay
14%13%6%12%8%46%35%6%19%
1335
December1st to 15thDay
8%15%8%11%10%37%6%6%6%15%
1260
16th to endDay
13%15%6%13%8%46%445%17%
1344
January1st to 15thNight
8%13%6%8%8%46%7%7%6%21%
2685
16th to endNight
10%12%7%10%8%47%7%6%5%18%
2729
February1st to 15thNight
7%10%48%7%37%8%6%7%28%
2359
16th to endNight
8%9%5%11%7%46%45%7%29%
1994
March1st to 15thNight
10%11%5%9%7%35%347%32%
2091
16th to endNight
13%10%36%5%245%6%7%33%
2112
April1st to 15thNight
9%6%35%5%36%5%5%6%40%
1705
16th to endNight
12%9%37%5%345%46%36%
1620
May1st to 15thNight
15%8%26%5%25%45%5%36%
1471
16th to endNight
17%5%25%3235%5%7%40%
1310
June1st to 15thNight
13%6%34445%5%7%6%38%
1260
16th to endNight
10%424435%46%10%43%
1260
July1st to 15thNight
7%21342446%10%52%
1260
16th to endNight
441333445%10%53%
1363
August1st to 15thNight
6%425%6%3446%7%48%
1527
16th to endNight
7%31441336%8%54%
1719
September1st to 15thNight
8%5%2442346%7%50%
1815
16th to endNight
14%6%25%42445%6%43%
1891
October1st to 15thNight
16%10%46%5%345%46%31%
1932
16th to endNight
16%10%37%5%35%45%5%31%
2277
November1st to 15thNight
13%12%6%7%5%34446%29%
2418
16th to endNight
11%11%6%12%8%35%5%5%5%22%
2625
December1st to 15thNight
8%13%7%12%8%5%6%5%5%6%18%
2700
16th to endNight
13%15%8%11%9%46%44415%
2880

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%11%7%8%9%5%6%5%6%7%21%
1253
16th to endDay
11%14%7%9%8%48%6%6%6%16%
1494
February1st to 15thDay
7%10%310%8%5%7%6%7%6%25%
1494
16th to endDay
10%11%5%10%7%6%8%6%6%6%18%
1491
March1st to 15thDay
10%11%7%10%8%45%5%5%6%22%
1869
16th to endDay
12%11%48%7%37%5%6%6%26%
2110
April1st to 15thDay
12%9%5%7%424347%38%
2243
16th to endDay
12%8%36%5%3445%7%37%
2340
May1st to 15thDay
18%9%35%424346%37%
2478
16th to endDay
20%6%2442445%6%37%
2803
June1st to 15thDay
15%6%37%5%446%5%7%32%
2700
16th to endDay
14%5%35%5%35%6%6%8%35%
2700
July1st to 15thDay
11%42443446%8%46%
2700
16th to endDay
8%313435%5%7%8%47%
2803
August1st to 15thDay
10%425%5%35%6%5%8%43%
2432
16th to endDay
10%424424448%49%
2483
September1st to 15thDay
11%5%26%43345%7%44%
2145
16th to endDay
15%6%2442335%8%42%
1881
October1st to 15thDay
16%11%48%7%33446%29%
1686
16th to endDay
17%12%38%6%345%46%26%
1592
November1st to 15thDay
14%12%7%10%6%23346%29%
1440
16th to endDay
14%13%6%11%8%45%45%5%20%
1335
December1st to 15thDay
8%15%8%11%10%46%6%5%6%15%
1260
16th to endDay
13%14%8%12%7%46%45%5%16%
1344
January1st to 15thNight
8%13%6%8%8%47%7%6%6%21%
2685
16th to endNight
10%13%7%10%8%47%6%6%5%18%
2729
February1st to 15thNight
8%10%48%6%37%8%6%6%28%
2359
16th to endNight
9%9%5%10%7%45%46%7%29%
1994
March1st to 15thNight
10%11%5%9%6%34346%32%
2091
16th to endNight
13%10%36%5%25%46%7%33%
2112
April1st to 15thNight
9%6%35%6%35%5%6%6%40%
1705
16th to endNight
12%8%37%5%35%5%46%37%
1620
May1st to 15thNight
15%8%26%5%25%45%5%36%
1471
16th to endNight
18%5%3442345%6%40%
1310
June1st to 15thNight
13%5%35%5%45%46%7%38%
1260
16th to endNight
11%42443446%9%43%
1260
July1st to 15thNight
7%2432447%11%51%
1260
16th to endNight
44124235%5%11%53%
1363
August1st to 15thNight
6%326%6%345%5%7%48%
1527
16th to endNight
8%31442335%8%53%
1719
September1st to 15thNight
8%5%2442345%7%50%
1815
16th to endNight
14%5%25%5%2435%7%43%
1891
October1st to 15thNight
17%11%37%6%34446%31%
1932
16th to endNight
15%12%37%5%44445%31%
2277
November1st to 15thNight
13%12%6%7%7%245%36%29%
2418
16th to endNight
12%11%6%12%9%45%5%45%22%
2625
December1st to 15thNight
8%13%7%13%9%47%6%5%6%18%
2700
16th to endNight
13%16%7%12%9%5%6%44415%
2880

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
59%313%17%4
1254
16th to endDay
65%410%15%3
1494
February1st to 15thDay
56%316%16%6%
1495
16th to endDay
63%410%16%4
1491
March1st to 15thDay
60%5%11%17%4
1869
16th to endDay
56%415%16%6%
2112
April1st to 15thDay
46%314%25%8%1
2243
16th to endDay
46%314%21%10%2
2340
May1st to 15thDay
48%39%27%9%
2478
16th to endDay
47%49%25%12%1
2807
June1st to 15thDay
47%5%15%22%8%
2700
16th to endDay
43%6%19%23%5%
2700
July1st to 15thDay
33%420%32%8%
2541
16th to endDay
30%5%22%31%8%
2627
August1st to 15thDay
36%5%20%28%7%
2416
16th to endDay
32%420%32%9%
2483
September1st to 15thDay
37%420%28%7%
2145
16th to endDay
40%418%29%7%
1881
October1st to 15thDay
53%414%22%5%
1686
16th to endDay
56%418%15%4
1592
November1st to 15thDay
55%5%12%18%6%1
1440
16th to endDay
65%413%13%3
1335
December1st to 15thDay
65%5%14%11%2
1260
16th to endDay
68%311%13%3
1344
January1st to 15thNight
59%410%18%6%
2685
16th to endNight
63%5%11%15%4
2729
February1st to 15thNight
51%417%18%6%
2369
16th to endNight
53%314%22%6%
1994
March1st to 15thNight
54%214%21%6%
2091
16th to endNight
50%413%23%7%
2112
April1st to 15thNight
41%412%23%14%3
1705
16th to endNight
47%311%22%13%2
1620
May1st to 15thNight
47%311%25%11%
1472
16th to endNight
43%49%24%16%1
1311
June1st to 15thNight
42%416%22%12%1
1260
16th to endNight
35%5%23%25%7%1
1260
July1st to 15thNight
25%5%19%34%14%
1190
16th to endNight
25%5%17%38%12%1
1276
August1st to 15thNight
33%418%32%10%1
1519
16th to endNight
28%318%32%15%1
1719
September1st to 15thNight
33%216%32%12%2
1815
16th to endNight
40%415%27%10%
1891
October1st to 15thNight
53%414%20%6%
1932
16th to endNight
53%415%23%3
2277
November1st to 15thNight
55%415%17%5%1
2418
16th to endNight
61%5%12%15%4
2625
December1st to 15thNight
64%414%13%2
2700
16th to endNight
71%39%12%3
2880

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
7%5%25%41%16%3
90
16th to endDay
23%220%32%16%4
96
February1st to 15thDay
10%11%51%21%5%1
90
16th to endDay
16%133%30%16%2
81
March1st to 15thDay
12%7%28%37%13%
90
16th to endDay
30%5%23%19%16%4
96
April1st to 15thDay
14%9%32%30%10%2
362
16th to endDay
16%8%30%29%12%2
450
May1st to 15thDay
21%9%27%26%12%2
468
16th to endDay
22%9%23%21%19%3
517
June1st to 15thDay
18%7%29%24%14%5%
495
16th to endDay
14%5%25%32%16%5%
495
July1st to 15thDay
11%422%32%21%6%
475
16th to endDay
6%429%27%24%6%
515
August1st to 15thDay
12%222%30%22%9%
493
16th to endDay
10%421%31%24%6%
523
September1st to 15thDay
14%430%29%17%4
300
16th to endDay
17%8%35%22%13%2
108
October1st to 15thDay
26%6%16%36%12%1
90
16th to endDay
29%227%27%11%3
96
November1st to 15thDay
23%11%17%32%14%1
90
16th to endDay
33%6%26%20%12%1
90
December1st to 15thDay
20%320%37%14%4
90
16th to endDay
23%5%32%18%12%7%
96
January1st to 15thNight
14%7%28%33%15%1
900
16th to endNight
17%8%29%34%10%
960
February1st to 15thNight
12%7%25%37%15%2
880
16th to endNight
12%5%25%34%17%3
732
March1st to 15thNight
16%6%27%30%17%2
651
16th to endNight
19%423%32%17%3
576
April1st to 15thNight
12%6%30%33%15%1
539
16th to endNight
17%426%39%12%
540
May1st to 15thNight
20%6%26%32%12%1
540
16th to endNight
21%5%24%34%14%
563
June1st to 15thNight
18%427%30%17%1
540
16th to endNight
11%423%40%19%
540
July1st to 15thNight
8%321%42%22%
510
16th to endNight
7%220%39%26%3
564
August1st to 15thNight
8%120%41%24%4
539
16th to endNight
10%319%38%25%1
573
September1st to 15thNight
12%123%41%19%2
540
16th to endNight
17%426%36%14%1
513
October1st to 15thNight
25%7%28%29%9%
612
16th to endNight
22%7%25%32%11%1
869
November1st to 15thNight
21%9%27%28%11%2
875
16th to endNight
17%8%34%29%9%1
900
December1st to 15thNight
14%5%27%35%14%2
900
16th to endNight
21%7%25%28%12%3
960
Page generated at 2017-09-23 05:43:43. Version ac04

Copyright 2017 A. Danko


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