Killen's Pond State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Killen's Pond State Park clear sky chart from 2005-11-05 to 2017-09-19.

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
40%
15219
20%
46892
12%
15184
50%
15184
26%
29455

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
25%
718
22%
2494
9%
716
42%
716
20%
1526
January16th to endNight
23%
768
22%
2496
8%
768
41%
768
23%
1550
February1st to 15thNight
23%
703
20%
2252
8%
701
39%
701
23%
1408
February16th to endNight
22%
631
26%
1893
9%
631
43%
631
24%
1167
March1st to 15thNight
28%
720
21%
2079
10%
720
40%
720
27%
1331
March16th to endNight
27%
768
21%
2038
9%
768
37%
768
26%
1377
April1st to 15thNight
29%
718
19%
1796
5%
718
38%
718
31%
1179
April16th to endNight
40%
720
19%
1800
8%
720
43%
720
30%
1198
May1st to 15thNight
37%
564
17%
1644
9%
564
43%
564
24%
1125
May16th to endNight
54%
374
15%
1497
14%
374
59%
374
19%
934
June1st to 15thNight
56%
360
16%
1440
17%
360
62%
360
24%
845
June16th to endNight
60%
360
15%
1440
17%
360
64%
360
24%
836
July1st to 15thNight
62%
340
13%
1360
17%
340
64%
340
21%
854
July16th to endNight
67%
453
16%
1489
14%
425
71%
425
29%
865
August1st to 15thNight
69%
593
17%
1663
13%
590
70%
590
32%
1054
August16th to endNight
67%
764
19%
1910
11%
764
67%
764
35%
1255
September1st to 15thNight
59%
720
24%
1800
15%
720
62%
720
35%
1180
September16th to endNight
56%
673
22%
1816
19%
673
58%
673
29%
1207
October1st to 15thNight
50%
660
23%
1980
21%
660
56%
660
27%
1251
October16th to endNight
37%
704
27%
2123
16%
704
51%
704
30%
1262
November1st to 15thNight
37%
700
23%
2277
14%
700
50%
700
27%
1364
November16th to endNight
35%
720
22%
2397
14%
720
47%
720
23%
1454
December1st to 15thNight
28%
720
18%
2520
8%
720
41%
720
20%
1576
December16th to endNight
25%
768
22%
2688
9%
768
42%
768
21%
1657

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%5%2443445%7%43%
47918
Night
14%5%2442445%7%44%
47070
Cloud CoverDay
13%5%2443445%7%43%
47927
Night
14%5%2442445%7%44%
47075
TransparencyDay
38%6%12%23%16%2
47613
Night
39%5%11%22%17%3
46892
SeeingDay
16%6%23%26%19%7%
5791
Night
17%7%28%31%13%1
15223

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
13%5%34434446%45%
1442
16th to endDay
17%6%15%324446%44%
1728
February1st to 15thDay
14%6%24424447%43%
1608
16th to endDay
13%7%35%42445%6%42%
1580
March1st to 15thDay
15%5%25%424445%45%
1868
16th to endDay
16%6%24424445%43%
2185
April1st to 15thDay
13%6%2332445%6%46%
2152
16th to endDay
14%5%245%2445%7%45%
2160
May1st to 15thDay
15%5%244235%5%8%41%
2314
16th to endDay
13%424435%5%6%7%42%
2618
June1st to 15thDay
11%425%445%5%6%9%40%
2520
16th to endDay
9%314435%5%8%9%42%
2520
July1st to 15thDay
8%5%25%5%36%5%6%10%41%
2520
16th to endDay
7%315%5%47%7%8%12%36%
2574
August1st to 15thDay
10%5%35%5%346%6%9%39%
2274
16th to endDay
9%425%5%45%5%7%7%43%
2292
September1st to 15thDay
12%5%2443447%7%43%
2160
16th to endDay
14%6%26%5%35%446%39%
1887
October1st to 15thDay
18%4134235%46%45%
1650
16th to endDay
16%424323345%50%
1747
November1st to 15thDay
16%5%13324446%46%
1581
16th to endDay
15%324425%35%6%46%
1562
December1st to 15thDay
14%5%244345%46%44%
1440
16th to endDay
18%6%25%433237%41%
1536
January1st to 15thNight
16%5%2442435%6%43%
2494
16th to endNight
17%5%24323446%44%
2496
February1st to 15thNight
15%6%34423445%43%
2251
16th to endNight
16%42432335%5%47%
1893
March1st to 15thNight
16%6%24323447%45%
2067
16th to endNight
17%6%345%24345%42%
2038
April1st to 15thNight
14%6%24423346%45%
1796
16th to endNight
17%4135%3435%6%44%
1800
May1st to 15thNight
15%9%35%43345%8%36%
1644
16th to endNight
12%5%26%435%5%6%8%39%
1495
June1st to 15thNight
11%5%244345%5%9%42%
1440
16th to endNight
8%4245%35%6%6%9%41%
1440
July1st to 15thNight
8%425%7%45%5%5%10%40%
1440
16th to endNight
5%4246%36%5%6%12%41%
1591
August1st to 15thNight
6%425%6%35%5%6%8%44%
1674
16th to endNight
9%5%25%42446%8%44%
1910
September1st to 15thNight
13%5%145%2335%6%46%
1800
16th to endNight
15%6%234335%6%6%42%
1816
October1st to 15thNight
17%5%24323336%46%
1980
16th to endNight
14%5%24322436%50%
2123
November1st to 15thNight
14%6%2431433450%
2277
16th to endNight
14%5%2443445%7%43%
2397
December1st to 15thNight
16%6%25%334446%41%
2520
16th to endNight
17%5%24423446%42%
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
13%6%3442445%6%45%
1442
16th to endDay
17%6%14324446%44%
1728
February1st to 15thDay
15%6%24334446%43%
1608
16th to endDay
13%7%35%42445%6%43%
1580
March1st to 15thDay
15%5%25%42445%5%44%
1878
16th to endDay
16%6%245%24345%43%
2184
April1st to 15thDay
13%6%2332346%6%46%
2152
16th to endDay
14%5%245%24447%45%
2160
May1st to 15thDay
15%6%2442446%8%41%
2314
16th to endDay
13%4244345%7%8%42%
2618
June1st to 15thDay
11%425%445%5%6%10%40%
2520
16th to endDay
9%324335%6%7%11%42%
2520
July1st to 15thDay
9%5%25%435%6%6%10%41%
2520
16th to endDay
6%415%5%36%7%9%12%36%
2574
August1st to 15thDay
10%5%25%6%345%7%9%38%
2274
16th to endDay
9%425%5%45%6%6%9%42%
2292
September1st to 15thDay
12%424435%45%8%44%
2160
16th to endDay
15%6%26%5%34446%39%
1887
October1st to 15thDay
17%5%14424445%45%
1650
16th to endDay
15%5%24313346%49%
1747
November1st to 15thDay
17%42332445%6%46%
1581
16th to endDay
14%42442445%6%46%
1562
December1st to 15thDay
14%435%4245%46%43%
1440
16th to endDay
18%6%25%423237%41%
1536
January1st to 15thNight
16%6%2442345%6%43%
2494
16th to endNight
17%5%24323446%44%
2496
February1st to 15thNight
15%6%24433445%43%
2244
16th to endNight
15%5%15%32335%448%
1893
March1st to 15thNight
16%6%24324446%45%
2079
16th to endNight
17%6%35%424346%42%
2038
April1st to 15thNight
15%5%24423347%45%
1796
16th to endNight
17%414425%35%6%44%
1800
May1st to 15thNight
15%8%25%42346%7%37%
1644
16th to endNight
11%6%25%5%35%45%8%40%
1495
June1st to 15thNight
11%425%435%45%9%43%
1440
16th to endNight
8%4246%36%6%6%9%41%
1440
July1st to 15thNight
8%5%25%6%45%5%5%10%40%
1440
16th to endNight
5%4246%36%6%7%11%42%
1591
August1st to 15thNight
6%435%5%35%5%6%9%44%
1674
16th to endNight
9%5%25%5%245%6%8%44%
1910
September1st to 15thNight
13%5%145%2345%6%47%
1800
16th to endNight
15%6%244345%5%7%41%
1816
October1st to 15thNight
17%6%24323346%46%
1980
16th to endNight
14%424322335%50%
2123
November1st to 15thNight
14%6%2441423450%
2277
16th to endNight
14%6%2443435%7%44%
2397
December1st to 15thNight
17%6%2442445%6%41%
2520
16th to endNight
17%5%24423447%42%
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
39%5%14%22%13%4
1443
16th to endDay
40%311%25%15%3
1728
February1st to 15thDay
40%412%25%13%2
1611
16th to endDay
41%411%25%14%1
1580
March1st to 15thDay
40%412%23%16%2
1878
16th to endDay
42%5%8%22%17%3
2185
April1st to 15thDay
36%5%11%25%16%4
2152
16th to endDay
38%5%11%17%20%5%
2160
May1st to 15thDay
39%6%13%21%16%1
2314
16th to endDay
37%7%14%25%13%1
2622
June1st to 15thDay
37%9%14%24%12%1
2520
16th to endDay
33%8%16%21%18%1
2520
July1st to 15thDay
35%9%13%23%14%3
2371
16th to endDay
34%9%16%23%13%2
2413
August1st to 15thDay
38%7%13%25%14%1
2261
16th to endDay
35%8%13%21%16%4
2292
September1st to 15thDay
37%6%12%21%19%2
2160
16th to endDay
44%5%8%19%21%1
1887
October1st to 15thDay
38%5%10%26%15%3
1650
16th to endDay
35%48%28%19%2
1747
November1st to 15thDay
37%5%11%23%19%2
1581
16th to endDay
37%410%27%16%3
1562
December1st to 15thDay
40%5%15%22%12%3
1440
16th to endDay
45%211%25%13%1
1536
January1st to 15thNight
41%410%21%17%3
2494
16th to endNight
41%410%26%15%1
2496
February1st to 15thNight
41%310%25%15%2
2252
16th to endNight
38%39%25%20%2
1893
March1st to 15thNight
39%411%24%16%2
2079
16th to endNight
43%410%19%18%3
2038
April1st to 15thNight
39%411%21%19%4
1796
16th to endNight
39%410%19%19%6%
1800
May1st to 15thNight
44%6%10%21%14%2
1644
16th to endNight
40%9%14%18%14%2
1497
June1st to 15thNight
37%6%14%22%16%1
1440
16th to endNight
35%8%15%22%16%2
1440
July1st to 15thNight
39%9%15%18%13%3
1360
16th to endNight
32%8%18%25%13%1
1489
August1st to 15thNight
34%7%16%21%18%
1663
16th to endNight
35%6%13%20%20%2
1910
September1st to 15thNight
36%5%11%24%18%3
1800
16th to endNight
39%6%7%21%21%3
1816
October1st to 15thNight
40%410%23%17%3
1980
16th to endNight
35%49%27%19%3
2123
November1st to 15thNight
38%310%22%17%7%
2277
16th to endNight
39%311%24%17%3
2397
December1st to 15thNight
43%412%23%13%2
2520
16th to endNight
42%413%23%14%2
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
17%17%37%20%41
62
16th to endDay
23%16%39%12%7%
96
February1st to 15thDay
24%17%36%17%4
125
16th to endDay
14%14%45%23%2
239
March1st to 15thDay
19%12%30%28%7%
270
16th to endDay
20%7%39%21%7%3
288
April1st to 15thDay
15%10%34%25%11%2
270
16th to endDay
20%5%25%26%19%2
270
May1st to 15thDay
26%9%31%19%10%3
288
16th to endDay
18%318%23%26%8%
331
June1st to 15thDay
15%223%29%21%8%
315
16th to endDay
12%20%37%22%5%
315
July1st to 15thDay
11%214%34%28%8%
305
16th to endDay
7%111%30%34%15%
326
August1st to 15thDay
15%111%27%30%14%
313
16th to endDay
8%17%29%37%16%
332
September1st to 15thDay
13%220%22%24%16%
315
16th to endDay
23%213%26%20%14%
266
October1st to 15thDay
21%320%25%20%8%
255
16th to endDay
17%6%28%28%17%1
269
November1st to 15thDay
18%7%27%24%17%4
235
16th to endDay
15%15%31%19%15%1
182
December1st to 15thDay
15%16%26%28%10%3
60
16th to endDay
35%10%31%14%7%
64
January1st to 15thNight
17%16%35%24%6%
720
16th to endNight
20%11%40%24%2
768
February1st to 15thNight
18%12%40%26%1
704
16th to endNight
18%16%39%23%2
631
March1st to 15thNight
20%10%37%26%5%
720
16th to endNight
20%7%40%21%7%1
768
April1st to 15thNight
17%10%39%27%5%
718
16th to endNight
19%430%33%11%
720
May1st to 15thNight
20%5%30%31%11%
564
16th to endNight
13%320%40%20%1
375
June1st to 15thNight
11%121%43%21%
360
16th to endNight
10%118%49%19%1
360
July1st to 15thNight
11%214%46%25%
340
16th to endNight
5%113%42%34%2
453
August1st to 15thNight
9%10%47%29%1
593
16th to endNight
12%111%38%32%4
764
September1st to 15thNight
16%114%38%26%2
720
16th to endNight
19%214%34%25%4
673
October1st to 15thNight
20%418%33%19%3
660
16th to endNight
18%7%33%26%14%
704
November1st to 15thNight
17%7%31%26%14%2
700
16th to endNight
16%12%31%28%10%1
720
December1st to 15thNight
21%10%33%21%11%1
720
16th to endNight
19%11%39%26%3
768
Page generated at 2017-09-20 04:49:55. Version ac04

Copyright 2017 A. Danko


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