Little Bennett Regional Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Bennett Regional Park clear sky chart from 2005-11-05 to 2017-08-12.

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
37%
15069
20%
46533
11%
15030
48%
15030
24%
29446

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
20%
717
21%
2422
8%
716
37%
716
18%
1549
January16th to endNight
19%
768
22%
2496
6%
768
39%
768
20%
1565
February1st to 15thNight
21%
703
19%
2287
5%
701
38%
701
19%
1420
February16th to endNight
17%
631
23%
1925
5%
631
38%
631
19%
1229
March1st to 15thNight
24%
720
21%
2001
8%
720
37%
720
23%
1309
March16th to endNight
22%
768
20%
2091
8%
768
33%
768
23%
1410
April1st to 15thNight
27%
718
18%
1796
4%
718
35%
718
27%
1221
April16th to endNight
38%
720
18%
1800
7%
720
43%
720
29%
1219
May1st to 15thNight
37%
545
17%
1625
9%
545
44%
545
23%
1102
May16th to endNight
50%
374
17%
1497
15%
374
58%
374
22%
893
June1st to 15thNight
53%
360
18%
1440
18%
360
60%
360
24%
830
June16th to endNight
59%
360
17%
1440
18%
360
65%
360
25%
824
July1st to 15thNight
59%
340
11%
1360
14%
340
61%
340
17%
887
July16th to endNight
70%
545
16%
1576
13%
512
75%
512
36%
893
August1st to 15thNight
68%
527
19%
1575
15%
524
69%
524
30%
1000
August16th to endNight
63%
684
18%
1734
12%
684
64%
684
33%
1152
September1st to 15thNight
56%
660
26%
1650
14%
660
61%
660
35%
1074
September16th to endNight
51%
657
22%
1813
17%
657
55%
657
28%
1214
October1st to 15thNight
45%
660
24%
1980
20%
660
53%
660
27%
1275
October16th to endNight
35%
704
27%
2112
15%
704
50%
704
31%
1238
November1st to 15thNight
36%
700
25%
2224
14%
700
50%
700
27%
1334
November16th to endNight
29%
720
21%
2481
11%
720
43%
720
21%
1484
December1st to 15thNight
25%
720
18%
2520
7%
720
39%
720
17%
1628
December16th to endNight
21%
768
21%
2688
7%
768
39%
768
18%
1696

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
14%5%245%3445%7%41%
47432
Night
13%5%2442445%7%43%
46715
Cloud CoverDay
14%5%245%3445%7%41%
47442
Night
13%5%2442445%7%43%
46719
TransparencyDay
40%6%12%22%15%2
47132
Night
39%6%11%22%16%2
46533
SeeingDay
17%9%23%24%17%7%
5509
Night
17%10%29%28%12%1
15074

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
16%6%25%3345%5%7%39%
1513
16th to endDay
15%8%25%424446%41%
1728
February1st to 15thDay
13%8%35%6%26%5%5%438%
1575
16th to endDay
14%7%45%5%33446%41%
1548
March1st to 15thDay
15%6%345%35%436%42%
1945
16th to endDay
15%7%36%5%24446%39%
2133
April1st to 15thDay
14%5%245%2436%7%42%
2152
16th to endDay
17%6%24423346%44%
2160
May1st to 15thDay
16%5%35%4345%6%8%36%
2336
16th to endDay
16%425%5%345%5%8%39%
2618
June1st to 15thDay
11%414436%5%6%10%41%
2520
16th to endDay
10%4145%25%5%6%9%44%
2520
July1st to 15thDay
9%5%246%36%6%6%8%39%
2520
16th to endDay
7%315%5%37%7%8%9%39%
2483
August1st to 15thDay
12%425%6%45%5%7%9%35%
2288
16th to endDay
11%5%135%25%5%5%9%42%
2103
September1st to 15thDay
14%424423348%46%
1980
16th to endDay
15%5%245%2445%7%40%
1814
October1st to 15thDay
19%5%23323346%44%
1650
16th to endDay
14%5%24423445%48%
1760
November1st to 15thDay
13%6%2342336%6%47%
1634
16th to endDay
17%6%25%324446%43%
1476
December1st to 15thDay
16%5%25%5%3446%7%38%
1440
16th to endDay
17%7%25%43445%6%38%
1536
January1st to 15thNight
17%6%3443445%7%39%
2422
16th to endNight
16%6%25%43445%6%42%
2496
February1st to 15thNight
14%7%24423446%44%
2285
16th to endNight
13%8%25%424447%41%
1925
March1st to 15thNight
16%6%15%424446%43%
1989
16th to endNight
15%6%25%424346%42%
2091
April1st to 15thNight
12%5%35%5%35%46%7%41%
1796
16th to endNight
15%43343445%7%43%
1800
May1st to 15thNight
17%7%35%42346%7%37%
1625
16th to endNight
12%5%24425%46%9%42%
1495
June1st to 15thNight
11%314435%5%6%10%43%
1440
16th to endNight
8%425%435%5%6%9%44%
1440
July1st to 15thNight
8%5%25%6%47%6%7%9%35%
1440
16th to endNight
5%313426%6%7%11%46%
1683
August1st to 15thNight
8%425%435%5%7%8%43%
1586
16th to endNight
10%425%435%5%6%7%44%
1734
September1st to 15thNight
11%5%2433345%7%47%
1650
16th to endNight
13%7%25%5%23446%44%
1813
October1st to 15thNight
19%4145%23435%44%
1980
16th to endNight
14%413323346%51%
2112
November1st to 15thNight
12%6%25%423335%50%
2224
16th to endNight
15%42443445%7%43%
2481
December1st to 15thNight
17%5%36%5%345%45%38%
2520
16th to endNight
16%6%25%42445%8%39%
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
16%6%25%3245%5%7%39%
1513
16th to endDay
15%7%25%424437%41%
1728
February1st to 15thDay
13%7%35%5%36%5%5%5%38%
1575
16th to endDay
14%7%36%5%34345%40%
1548
March1st to 15thDay
15%6%35%435%436%42%
1956
16th to endDay
15%7%36%5%2435%6%39%
2132
April1st to 15thDay
14%5%2443345%7%43%
2152
16th to endDay
17%6%2432335%6%43%
2160
May1st to 15thDay
16%5%245%345%6%8%36%
2336
16th to endDay
15%5%15%5%3445%8%39%
2618
June1st to 15thDay
11%424435%5%7%10%41%
2520
16th to endDay
10%4236%245%6%9%44%
2520
July1st to 15thDay
9%5%245%36%5%7%9%39%
2520
16th to endDay
7%3145%37%7%8%10%38%
2483
August1st to 15thDay
12%5%246%46%5%7%8%35%
2288
16th to endDay
12%5%145%35%5%7%8%42%
2103
September1st to 15thDay
14%4145%23448%46%
1980
16th to endDay
15%6%25%4245%47%40%
1814
October1st to 15thDay
19%5%2342335%6%44%
1650
16th to endDay
14%5%23423445%48%
1760
November1st to 15thDay
13%6%2341435%6%47%
1634
16th to endDay
16%6%14424446%43%
1476
December1st to 15thDay
16%5%25%5%3446%7%38%
1440
16th to endDay
17%7%25%434447%38%
1536
January1st to 15thNight
16%6%3442445%7%39%
2422
16th to endNight
16%6%3342435%6%42%
2496
February1st to 15thNight
13%7%245%2345%6%44%
2278
16th to endNight
13%8%35%42445%6%41%
1925
March1st to 15thNight
16%5%2442445%6%43%
2001
16th to endNight
15%6%345%24446%42%
2091
April1st to 15thNight
12%5%45%435%45%8%41%
1796
16th to endNight
14%5%24425%45%7%43%
1800
May1st to 15thNight
17%7%25%42345%7%38%
1624
16th to endNight
12%5%244245%5%9%42%
1495
June1st to 15thNight
10%324436%5%6%9%43%
1440
16th to endNight
7%5%25%5%35%45%10%44%
1440
July1st to 15thNight
8%5%26%6%46%7%7%8%36%
1440
16th to endNight
6%313426%6%7%10%46%
1683
August1st to 15thNight
8%425%5%35%47%8%44%
1586
16th to endNight
10%424435%5%6%7%44%
1734
September1st to 15thNight
11%5%145%3345%8%46%
1650
16th to endNight
13%6%35%5%24346%44%
1813
October1st to 15thNight
19%415%424345%45%
1980
16th to endNight
14%313313446%51%
2112
November1st to 15thNight
12%6%245%13335%50%
2224
16th to endNight
16%424424447%43%
2481
December1st to 15thNight
17%5%26%5%25%446%38%
2520
16th to endNight
16%6%3442435%8%39%
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
42%7%13%21%12%2
1514
16th to endDay
43%313%24%12%3
1728
February1st to 15thDay
43%6%11%24%11%2
1577
16th to endDay
44%412%25%12%1
1548
March1st to 15thDay
42%412%22%15%2
1956
16th to endDay
44%5%11%18%17%2
2133
April1st to 15thDay
40%411%21%17%3
2152
16th to endDay
40%5%9%18%19%6%
2160
May1st to 15thDay
43%6%13%19%14%1
2336
16th to endDay
42%6%14%21%12%1
2622
June1st to 15thDay
35%8%14%26%12%1
2520
16th to endDay
34%8%14%22%16%1
2520
July1st to 15thDay
38%10%12%20%14%2
2371
16th to endDay
34%11%14%24%13%2
2327
August1st to 15thDay
41%8%13%20%14%1
2275
16th to endDay
36%8%12%24%15%2
2103
September1st to 15thDay
36%5%12%19%22%2
1980
16th to endDay
41%5%8%21%19%2
1814
October1st to 15thDay
39%411%24%16%3
1650
16th to endDay
37%410%27%18%1
1760
November1st to 15thDay
37%413%21%17%5%
1634
16th to endDay
41%410%26%15%1
1476
December1st to 15thDay
42%6%15%21%12%2
1440
16th to endDay
46%411%24%12%
1536
January1st to 15thNight
43%5%10%19%16%3
2422
16th to endNight
41%413%25%14%1
2496
February1st to 15thNight
39%5%12%23%15%2
2287
16th to endNight
42%49%26%16%1
1925
March1st to 15thNight
40%5%11%27%13%1
2001
16th to endNight
42%5%10%20%16%3
2091
April1st to 15thNight
40%5%10%20%18%3
1796
16th to endNight
39%5%10%20%17%6%
1800
May1st to 15thNight
44%6%10%21%14%2
1625
16th to endNight
37%8%17%20%14%2
1497
June1st to 15thNight
35%8%13%25%16%1
1440
16th to endNight
35%7%14%22%17%2
1440
July1st to 15thNight
42%11%13%16%11%4
1360
16th to endNight
27%8%20%23%18%2
1576
August1st to 15thNight
35%8%12%22%18%2
1575
16th to endNight
35%8%11%22%19%3
1734
September1st to 15thNight
35%6%13%19%21%3
1650
16th to endNight
41%6%9%19%20%3
1813
October1st to 15thNight
41%49%23%17%2
1980
16th to endNight
32%5%9%29%21%2
2112
November1st to 15thNight
37%47%23%20%7%
2224
16th to endNight
38%411%23%17%4
2481
December1st to 15thNight
45%5%11%23%12%1
2520
16th to endNight
43%5%13%23%12%1
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
26%30%27%13%11
73
16th to endDay
19%32%32%14%1
96
February1st to 15thDay
23%25%41%8%1
90
16th to endDay
16%19%43%18%1
207
March1st to 15thDay
17%22%29%22%6%
270
16th to endDay
19%17%32%20%6%3
288
April1st to 15thDay
17%16%28%21%12%2
270
16th to endDay
23%8%26%18%17%5%
270
May1st to 15thDay
26%15%22%19%10%5%
288
16th to endDay
20%420%26%21%6%
331
June1st to 15thDay
14%6%25%23%22%7%
315
16th to endDay
11%5%26%32%18%5%
315
July1st to 15thDay
15%123%27%24%7%
305
16th to endDay
9%111%35%29%11%
326
August1st to 15thDay
14%215%27%25%13%
297
16th to endDay
10%9%29%26%23%
268
September1st to 15thDay
13%5%16%18%26%19%
255
16th to endDay
23%316%26%18%12%
254
October1st to 15thDay
21%6%17%26%21%5%
255
16th to endDay
15%12%26%28%15%1
272
November1st to 15thDay
16%9%27%24%18%2
244
16th to endDay
23%15%28%18%11%2
96
December1st to 15thDay
18%26%28%13%10%3
60
16th to endDay
34%9%35%17%3
64
January1st to 15thNight
22%17%35%21%3
720
16th to endNight
21%17%38%21%1
768
February1st to 15thNight
20%16%36%25%1
704
16th to endNight
21%19%37%19%1
631
March1st to 15thNight
21%14%36%25%2
720
16th to endNight
19%14%40%19%5%1
768
April1st to 15thNight
15%17%38%23%4
718
16th to endNight
17%10%30%29%11%
720
May1st to 15thNight
19%8%28%29%12%
545
16th to endNight
15%5%20%38%18%1
375
June1st to 15thNight
11%26%35%24%
360
16th to endNight
10%120%50%16%1
360
July1st to 15thNight
12%115%43%26%1
340
16th to endNight
6%113%42%32%3
545
August1st to 15thNight
11%11%46%26%3
527
16th to endNight
13%113%37%28%4
684
September1st to 15thNight
13%121%29%30%2
660
16th to endNight
17%317%32%26%2
657
October1st to 15thNight
20%5%22%29%19%2
660
16th to endNight
17%11%33%26%10%
704
November1st to 15thNight
15%10%31%30%9%1
700
16th to endNight
19%17%29%25%8%
720
December1st to 15thNight
22%11%34%24%7%
720
16th to endNight
21%13%39%23%1
768
Page generated at 2017-08-13 14:16:31. Version ac04

Copyright 2017 A. Danko


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