Lake Harris Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Harris Campground clear sky chart from 2005-11-05 to 2017-09-16.

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
28%
14745
12%
46824
7%
14714
33%
14714
14%
34134

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
13%
720
6%
2506
4%
716
16%
716
6%
2044
January16th to endNight
16%
768
9%
2667
5%
768
22%
768
8%
2017
February1st to 15thNight
9%
704
7%
2277
1%
701
15%
701
6%
1812
February16th to endNight
15%
631
11%
1893
4%
631
25%
631
9%
1466
March1st to 15thNight
18%
720
12%
2157
7%
720
25%
720
13%
1627
March16th to endNight
25%
768
17%
1992
6%
768
33%
768
17%
1436
April1st to 15thNight
22%
718
12%
1796
4%
718
26%
718
16%
1380
April16th to endNight
27%
657
15%
1737
6%
657
32%
657
20%
1226
May1st to 15thNight
32%
414
16%
1494
13%
414
39%
414
15%
1024
May16th to endNight
36%
374
12%
1497
10%
374
45%
374
16%
980
June1st to 15thNight
35%
360
10%
1440
8%
360
45%
360
15%
972
June16th to endNight
44%
360
9%
1440
9%
360
51%
360
18%
922
July1st to 15thNight
50%
340
11%
1360
14%
340
54%
340
22%
810
July16th to endNight
55%
376
13%
1418
16%
354
61%
354
25%
822
August1st to 15thNight
50%
421
13%
1492
11%
419
54%
419
23%
928
August16th to endNight
52%
764
18%
1910
10%
764
54%
764
35%
1236
September1st to 15thNight
48%
720
15%
1800
8%
720
49%
720
29%
1227
September16th to endNight
45%
658
20%
1802
14%
658
50%
658
29%
1162
October1st to 15thNight
32%
660
16%
1950
11%
660
39%
660
16%
1406
October16th to endNight
22%
704
8%
2230
4%
704
27%
704
9%
1757
November1st to 15thNight
23%
700
13%
2277
9%
700
29%
700
12%
1682
November16th to endNight
22%
720
12%
2481
10%
720
27%
720
10%
1882
December1st to 15thNight
15%
720
5%
2520
2%
720
19%
720
5%
2088
December16th to endNight
11%
768
7%
2688
2%
768
17%
768
5%
2228

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
17%10%48%6%35%45%6%26%
47929
Night
16%10%48%6%35%45%6%27%
46993
Cloud CoverDay
18%9%47%6%35%45%6%27%
47938
Night
16%9%47%6%35%45%6%29%
46999
TransparencyDay
57%5%11%16%8%1
47616
Night
54%5%13%17%8%1
46824
SeeingDay
24%15%25%18%11%4
5622
Night
23%17%25%22%9%1
14746

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
15%16%7%12%8%45%46%5%14%
1432
16th to endDay
10%12%8%12%9%5%5%5%46%19%
1557
February1st to 15thDay
11%16%8%11%10%45%5%5%415%
1585
16th to endDay
14%14%6%12%8%43345%21%
1580
March1st to 15thDay
14%13%6%11%8%35%44421%
1790
16th to endDay
16%10%48%6%3434432%
2232
April1st to 15thDay
20%12%5%6%5%24345%29%
2152
16th to endDay
17%12%47%434345%31%
2223
May1st to 15thDay
22%12%36%5%24345%28%
2466
16th to endDay
19%9%46%6%345%46%28%
2618
June1st to 15thDay
24%7%36%7%35%5%5%7%24%
2520
16th to endDay
20%6%37%7%45%6%6%7%24%
2520
July1st to 15thDay
15%7%47%6%45%5%5%8%28%
2520
16th to endDay
15%7%36%7%46%7%7%8%25%
2654
August1st to 15thDay
15%8%48%6%46%6%6%7%25%
2442
16th to endDay
13%5%36%7%45%6%7%8%32%
2292
September1st to 15thDay
19%6%25%5%3345%7%36%
2160
16th to endDay
17%5%25%424346%41%
1830
October1st to 15thDay
24%12%35%5%2433429%
1679
16th to endDay
23%16%6%8%5%33445%19%
1641
November1st to 15thDay
15%11%47%7%36%45%6%26%
1581
16th to endDay
20%13%5%8%8%24435%23%
1479
December1st to 15thDay
20%17%7%9%9%34325%14%
1440
16th to endDay
19%16%10%13%6%2434413%
1536
January1st to 15thNight
15%13%7%13%9%45%6%5%413%
2506
16th to endNight
10%13%8%12%7%36%6%5%6%18%
2667
February1st to 15thNight
11%13%6%13%11%5%7%5%45%14%
2275
16th to endNight
13%11%6%10%9%47%5%6%6%18%
1893
March1st to 15thNight
15%12%5%7%7%36%44427%
2144
16th to endNight
14%10%46%6%45%336%33%
1992
April1st to 15thNight
21%10%5%7%6%35%445%26%
1796
16th to endNight
17%8%46%435%345%36%
1737
May1st to 15thNight
19%10%26%43345%6%33%
1494
16th to endNight
16%8%45%4246%6%7%32%
1495
June1st to 15thNight
22%6%25%5%2445%7%31%
1440
16th to endNight
16%6%34435%5%6%9%34%
1440
July1st to 15thNight
11%5%25%5%26%5%5%7%40%
1440
16th to endNight
10%5%25%4245%6%10%42%
1514
August1st to 15thNight
12%6%27%5%2446%7%39%
1502
16th to endNight
13%4144245%6%8%43%
1910
September1st to 15thNight
16%5%25%42345%7%42%
1800
16th to endNight
15%5%245%24446%44%
1802
October1st to 15thNight
20%10%46%424445%31%
1950
16th to endNight
20%13%49%8%35%445%20%
2230
November1st to 15thNight
15%11%5%10%6%45%5%5%6%24%
2277
16th to endNight
19%13%5%8%7%34445%22%
2481
December1st to 15thNight
21%16%6%10%8%34445%13%
2520
16th to endNight
19%15%7%13%7%3445%5%13%
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
15%15%6%12%7%36%5%5%6%15%
1432
16th to endDay
10%10%8%12%8%5%5%5%5%6%20%
1557
February1st to 15thDay
11%15%7%10%9%5%5%5%5%5%17%
1585
16th to endDay
14%13%6%12%8%43435%23%
1580
March1st to 15thDay
15%12%6%10%7%46%45%422%
1800
16th to endDay
16%9%47%6%44445%33%
2231
April1st to 15thDay
21%11%46%5%24345%30%
2152
16th to endDay
18%11%36%433445%32%
2223
May1st to 15thDay
22%11%36%434345%30%
2466
16th to endDay
19%8%36%5%345%46%30%
2618
June1st to 15thDay
24%5%36%6%35%5%5%8%24%
2520
16th to endDay
19%6%36%6%45%5%6%8%25%
2520
July1st to 15thDay
15%7%27%7%35%6%6%7%29%
2520
16th to endDay
15%6%47%7%45%5%7%9%26%
2654
August1st to 15thDay
15%8%37%7%5%6%5%6%8%26%
2442
16th to endDay
13%5%25%6%36%5%7%9%32%
2292
September1st to 15thDay
18%6%25%434447%36%
2160
16th to endDay
17%6%16%333347%41%
1830
October1st to 15thDay
24%11%35%5%2434430%
1679
16th to endDay
23%14%6%7%5%34445%20%
1641
November1st to 15thDay
15%10%5%7%6%45%5%5%7%27%
1581
16th to endDay
20%12%48%6%35%43426%
1479
December1st to 15thDay
20%15%7%10%8%4433416%
1440
16th to endDay
20%15%11%11%5%3444415%
1536
January1st to 15thNight
15%11%6%12%9%45%6%6%6%16%
2506
16th to endNight
10%11%7%12%8%345%6%7%21%
2667
February1st to 15thNight
11%11%6%11%10%5%7%6%5%5%17%
2268
16th to endNight
13%10%5%10%8%46%45%8%21%
1893
March1st to 15thNight
15%11%47%7%35%5%45%28%
2157
16th to endNight
14%9%46%5%345%46%34%
1992
April1st to 15thNight
21%10%45%5%3445%7%27%
1796
16th to endNight
18%7%35%5%3435%6%37%
1737
May1st to 15thNight
19%10%35%424446%34%
1494
16th to endNight
17%7%35%4245%6%8%33%
1495
June1st to 15thNight
22%5%245%335%5%8%33%
1440
16th to endNight
16%424425%47%8%37%
1440
July1st to 15thNight
11%5%25%435%5%6%7%41%
1440
16th to endNight
10%425%42446%10%44%
1514
August1st to 15thNight
12%5%25%4245%6%7%41%
1502
16th to endNight
13%42342446%7%46%
1910
September1st to 15thNight
14%5%245%3445%7%43%
1800
16th to endNight
15%423424446%46%
1802
October1st to 15thNight
20%9%46%5%24446%32%
1950
16th to endNight
20%10%48%6%46%5%46%21%
2230
November1st to 15thNight
14%9%5%8%6%26%45%6%27%
2277
16th to endNight
19%12%48%5%3445%6%24%
2481
December1st to 15thNight
21%14%6%9%8%35%45%5%16%
2520
16th to endNight
18%15%6%11%6%46%45%6%15%
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
70%49%11%4
1433
16th to endDay
62%412%12%6%1
1557
February1st to 15thDay
68%5%9%12%4
1587
16th to endDay
64%49%10%9%1
1580
March1st to 15thDay
65%410%11%6%1
1800
16th to endDay
53%39%14%14%3
2232
April1st to 15thDay
56%39%18%10%2
2152
16th to endDay
53%49%17%12%2
2223
May1st to 15thDay
57%47%19%9%1
2466
16th to endDay
54%6%12%16%9%
2622
June1st to 15thDay
57%6%12%15%7%
2520
16th to endDay
55%7%12%15%8%
2520
July1st to 15thDay
50%7%12%21%7%
2371
16th to endDay
51%7%14%18%6%
2487
August1st to 15thDay
53%8%12%17%7%
2428
16th to endDay
45%6%13%24%9%
2292
September1st to 15thDay
47%5%10%24%12%1
2160
16th to endDay
43%411%26%14%
1830
October1st to 15thDay
57%410%17%8%
1679
16th to endDay
65%5%11%11%5%
1641
November1st to 15thDay
55%6%12%16%6%2
1581
16th to endDay
62%410%13%7%1
1479
December1st to 15thDay
72%312%8%2
1440
16th to endDay
74%38%8%5%
1536
January1st to 15thNight
68%5%11%8%5%
2506
16th to endNight
61%410%15%6%1
2667
February1st to 15thNight
67%412%10%4
2277
16th to endNight
60%5%11%13%8%
1893
March1st to 15thNight
57%5%12%16%6%1
2157
16th to endNight
51%311%16%13%3
1992
April1st to 15thNight
56%410%17%9%1
1796
16th to endNight
47%411%21%12%2
1737
May1st to 15thNight
50%6%9%16%15%1
1494
16th to endNight
47%6%15%18%10%1
1497
June1st to 15thNight
50%5%16%20%7%
1440
16th to endNight
43%7%15%22%10%
1440
July1st to 15thNight
37%8%18%24%9%
1360
16th to endNight
34%8%20%24%11%1
1418
August1st to 15thNight
40%6%20%23%8%
1492
16th to endNight
34%6%17%31%10%
1910
September1st to 15thNight
40%6%14%26%10%1
1800
16th to endNight
38%6%11%29%13%1
1802
October1st to 15thNight
53%5%11%18%11%
1950
16th to endNight
63%5%12%12%4
2230
November1st to 15thNight
55%6%13%12%9%2
2277
16th to endNight
61%411%14%6%1
2481
December1st to 15thNight
71%411%9%2
2520
16th to endNight
70%5%10%10%3
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
31%21%26%10%10%
60
16th to endDay
22%31%31%10%21
67
February1st to 15thDay
32%33%24%7%
101
16th to endDay
24%26%26%18%4
239
March1st to 15thDay
28%17%27%21%4
270
16th to endDay
26%20%26%14%9%3
288
April1st to 15thDay
31%19%21%17%7%1
270
16th to endDay
26%13%26%17%10%5%
270
May1st to 15thDay
35%15%18%13%10%5%
288
16th to endDay
24%14%31%14%12%3
331
June1st to 15thDay
26%16%26%19%9%
315
16th to endDay
22%12%32%20%10%1
315
July1st to 15thDay
18%9%29%24%13%5%
305
16th to endDay
16%8%27%30%13%3
326
August1st to 15thDay
16%8%25%21%17%9%
313
16th to endDay
16%9%19%21%17%15%
332
September1st to 15thDay
18%6%25%16%19%13%
315
16th to endDay
15%11%22%20%18%11%
254
October1st to 15thDay
29%14%17%15%18%4
255
16th to endDay
31%20%24%19%5%
250
November1st to 15thDay
22%17%24%22%12%1
235
16th to endDay
31%22%20%18%7%1
99
December1st to 15thDay
38%16%25%15%31
60
16th to endDay
37%26%25%10%
64
January1st to 15thNight
27%23%31%15%2
720
16th to endNight
21%25%28%19%4
768
February1st to 15thNight
22%27%34%14%1
704
16th to endNight
21%26%29%18%3
631
March1st to 15thNight
27%20%29%19%2
720
16th to endNight
22%21%26%20%7%1
768
April1st to 15thNight
28%18%28%20%4
718
16th to endNight
26%16%26%21%9%
657
May1st to 15thNight
23%15%22%25%11%
414
16th to endNight
17%11%29%28%13%1
375
June1st to 15thNight
24%8%24%27%14%
360
16th to endNight
18%5%25%36%13%
360
July1st to 15thNight
12%5%23%35%21%1
340
16th to endNight
10%6%22%40%18%1
376
August1st to 15thNight
16%421%35%19%2
421
16th to endNight
14%7%19%30%24%2
764
September1st to 15thNight
17%8%22%30%18%2
720
16th to endNight
18%9%21%24%21%4
658
October1st to 15thNight
25%16%21%20%14%1
660
16th to endNight
30%18%22%22%6%
704
November1st to 15thNight
24%17%24%23%7%1
700
16th to endNight
30%19%21%16%9%1
720
December1st to 15thNight
31%25%23%15%4
720
16th to endNight
32%25%23%14%21
768
Page generated at 2017-09-16 17:06:58. Version ac04

Copyright 2017 A. Danko


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