Pardee Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pardee Lake 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
37%
15908
15%
47003
10%
15866
42%
15866
21%
32462

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
16%
900
10%
2506
4%
895
21%
895
12%
1985
January16th to endNight
21%
876
8%
2604
3%
876
25%
876
12%
2073
February1st to 15thNight
18%
701
9%
2247
3%
701
24%
701
11%
1713
February16th to endNight
25%
631
15%
1893
6%
631
33%
631
15%
1380
March1st to 15thNight
27%
720
15%
2088
8%
720
33%
720
18%
1498
March16th to endNight
32%
768
18%
2112
10%
768
39%
768
21%
1484
April1st to 15thNight
28%
572
14%
1806
7%
572
34%
572
19%
1238
April16th to endNight
34%
540
20%
1620
9%
540
44%
540
25%
1062
May1st to 15thNight
38%
540
14%
1620
8%
540
44%
540
22%
1112
May16th to endNight
50%
562
15%
1658
11%
561
55%
561
30%
1045
June1st to 15thNight
55%
540
15%
1440
11%
540
59%
540
35%
895
June16th to endNight
58%
540
16%
1440
12%
540
62%
540
37%
894
July1st to 15thNight
66%
510
16%
1360
14%
510
68%
510
40%
814
July16th to endNight
68%
564
20%
1486
17%
531
70%
531
42%
860
August1st to 15thNight
67%
539
21%
1609
17%
536
70%
536
36%
939
August16th to endNight
63%
573
22%
1755
18%
573
67%
573
34%
1024
September1st to 15thNight
58%
657
26%
1917
20%
657
63%
657
36%
1109
September16th to endNight
58%
673
23%
1858
17%
673
62%
673
33%
1140
October1st to 15thNight
46%
660
20%
1886
16%
660
51%
660
27%
1236
October16th to endNight
27%
704
15%
2218
9%
704
36%
704
17%
1559
November1st to 15thNight
35%
700
19%
2276
16%
700
41%
700
22%
1466
November16th to endNight
25%
720
14%
2343
9%
720
31%
720
15%
1699
December1st to 15thNight
18%
758
8%
2558
3%
758
23%
758
10%
1972
December16th to endNight
15%
960
8%
2703
2%
960
21%
960
9%
2265

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%8%47%6%35%45%7%33%
47802
Night
15%8%46%5%34446%35%
47180
Cloud CoverDay
14%8%47%6%35%45%7%32%
47812
Night
15%9%36%5%34446%35%
47184
TransparencyDay
49%411%21%11%1
47497
Night
48%412%21%11%1
47003
SeeingDay
16%7%26%24%16%8%
5872
Night
19%8%27%30%13%1
15912

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
18%16%6%12%6%44445%16%
1432
16th to endDay
16%19%8%9%8%44435%15%
1617
February1st to 15thDay
14%15%6%10%9%5%5%445%19%
1612
16th to endDay
14%15%6%11%7%2445%5%20%
1580
March1st to 15thDay
15%11%5%8%6%3445%6%28%
1861
16th to endDay
18%10%5%7%6%34345%30%
2112
April1st to 15thDay
20%10%45%5%24446%30%
2151
16th to endDay
16%7%36%5%33347%38%
2340
May1st to 15thDay
19%7%26%5%45%446%32%
2331
16th to endDay
13%5%35%5%35%45%8%38%
2454
June1st to 15thDay
10%5%35%6%45%5%5%8%40%
2520
16th to endDay
10%5%25%5%47%6%7%10%34%
2520
July1st to 15thDay
7%425%435%5%7%9%44%
2520
16th to endDay
7%5%25%6%36%5%8%9%39%
2580
August1st to 15thDay
8%5%26%6%46%5%5%8%39%
2340
16th to endDay
11%5%25%5%35%5%6%8%39%
2444
September1st to 15thDay
11%5%25%5%346%5%8%41%
2031
16th to endDay
12%5%26%5%245%6%8%39%
1848
October1st to 15thDay
14%7%38%5%24445%38%
1744
16th to endDay
20%10%36%6%34336%31%
1653
November1st to 15thDay
15%7%36%6%24446%37%
1582
16th to endDay
17%12%5%8%5%35%346%27%
1614
December1st to 15thDay
16%13%8%10%6%3445%5%20%
1401
16th to endDay
21%16%8%11%7%3334316%
1515
January1st to 15thNight
22%13%5%8%6%34345%22%
2506
16th to endNight
14%12%8%12%7%44446%19%
2604
February1st to 15thNight
16%15%5%8%6%35%34426%
2245
16th to endNight
15%11%5%8%7%3445%6%27%
1893
March1st to 15thNight
16%10%46%5%34446%32%
2076
16th to endNight
15%7%45%5%35%5%47%35%
2112
April1st to 15thNight
18%8%35%5%3445%6%33%
1806
16th to endNight
16%7%25%5%2445%6%39%
1620
May1st to 15thNight
19%6%26%44445%7%34%
1620
16th to endNight
12%5%25%435%349%43%
1656
June1st to 15thNight
10%4245%2446%8%46%
1440
16th to endNight
9%416%4235%6%10%44%
1440
July1st to 15thNight
7%21443445%7%52%
1440
16th to endNight
5%42443435%10%51%
1588
August1st to 15thNight
5%315%5%35%5%5%10%48%
1620
16th to endNight
10%425%423446%51%
1755
September1st to 15thNight
11%41341445%6%52%
1917
16th to endNight
10%5%15%434447%47%
1858
October1st to 15thNight
15%6%25%434446%41%
1886
16th to endNight
21%8%35%5%35%445%33%
2218
November1st to 15thNight
15%7%345%2445%6%39%
2276
16th to endNight
20%12%5%6%42445%5%28%
2343
December1st to 15thNight
20%13%6%8%6%35%435%22%
2558
16th to endNight
21%16%6%9%6%35%34415%
2703

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
18%16%6%11%7%44445%16%
1432
16th to endDay
16%19%8%9%8%45%435%14%
1617
February1st to 15thDay
14%14%7%10%9%45%445%18%
1612
16th to endDay
15%15%7%11%8%2446%5%20%
1580
March1st to 15thDay
16%11%5%8%6%435%46%27%
1872
16th to endDay
18%9%5%7%6%34346%30%
2111
April1st to 15thDay
20%10%45%5%24446%30%
2151
16th to endDay
16%8%36%5%24346%38%
2340
May1st to 15thDay
19%7%26%6%35%446%32%
2331
16th to endDay
13%6%35%5%35%45%8%38%
2454
June1st to 15thDay
10%5%35%5%35%5%5%8%40%
2520
16th to endDay
10%5%25%5%47%6%8%10%34%
2520
July1st to 15thDay
7%5%24425%5%7%9%44%
2520
16th to endDay
7%425%6%35%5%8%9%39%
2580
August1st to 15thDay
8%5%26%6%46%5%5%8%38%
2340
16th to endDay
10%5%25%6%35%5%6%8%39%
2444
September1st to 15thDay
11%5%26%5%35%5%5%8%41%
2031
16th to endDay
12%426%5%345%7%8%39%
1848
October1st to 15thDay
14%7%38%6%24446%39%
1744
16th to endDay
20%11%35%6%25%336%31%
1653
November1st to 15thDay
15%7%37%5%24446%37%
1582
16th to endDay
17%11%5%8%5%35%35%6%26%
1614
December1st to 15thDay
15%13%9%10%7%35%446%19%
1401
16th to endDay
21%16%8%11%6%3424316%
1515
January1st to 15thNight
22%13%47%7%34445%22%
2506
16th to endNight
14%13%7%12%7%45%446%19%
2604
February1st to 15thNight
16%15%5%7%6%44345%25%
2238
16th to endNight
15%10%5%8%7%35%447%26%
1893
March1st to 15thNight
17%10%46%5%34446%32%
2088
16th to endNight
15%7%35%6%35%447%35%
2112
April1st to 15thNight
18%8%26%5%25%5%5%6%33%
1806
16th to endNight
16%7%25%5%2445%6%39%
1620
May1st to 15thNight
18%6%27%43445%7%34%
1619
16th to endNight
12%5%25%5%34448%44%
1656
June1st to 15thNight
10%5%25%42445%7%47%
1440
16th to endNight
9%425%4245%6%10%43%
1440
July1st to 15thNight
7%21442445%8%52%
1440
16th to endNight
5%42343445%10%51%
1588
August1st to 15thNight
5%4145%35%5%6%9%47%
1620
16th to endNight
9%5%2442345%7%51%
1755
September1st to 15thNight
11%414313446%52%
1917
16th to endNight
11%5%26%433447%46%
1858
October1st to 15thNight
15%6%26%434446%41%
1886
16th to endNight
21%9%26%5%34445%33%
2218
November1st to 15thNight
15%7%35%42445%6%38%
2276
16th to endNight
20%12%45%5%34445%28%
2343
December1st to 15thNight
20%13%6%8%5%45%44422%
2558
16th to endNight
21%16%6%10%6%25%445%15%
2703

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
69%410%11%3
1433
16th to endDay
72%39%9%4
1617
February1st to 15thDay
67%48%13%6%
1614
16th to endDay
63%39%15%5%
1580
March1st to 15thDay
56%5%12%17%7%1
1872
16th to endDay
54%311%21%8%
2112
April1st to 15thDay
54%49%20%10%
2151
16th to endDay
46%413%17%14%2
2340
May1st to 15thDay
52%411%19%9%2
2331
16th to endDay
43%413%25%12%1
2458
June1st to 15thDay
40%5%12%25%14%1
2520
16th to endDay
41%6%14%21%15%
2520
July1st to 15thDay
34%5%11%26%19%2
2371
16th to endDay
36%6%14%24%15%2
2419
August1st to 15thDay
40%5%12%26%12%2
2327
16th to endDay
39%6%10%25%16%2
2444
September1st to 15thDay
40%5%11%27%14%1
2031
16th to endDay
39%5%11%30%13%
1848
October1st to 15thDay
45%411%23%13%1
1744
16th to endDay
54%314%19%6%
1653
November1st to 15thDay
46%410%22%12%1
1582
16th to endDay
58%312%19%5%
1614
December1st to 15thDay
64%312%15%3
1401
16th to endDay
73%211%8%3
1515
January1st to 15thNight
64%310%14%6%
2506
16th to endNight
65%413%12%4
2604
February1st to 15thNight
61%411%15%6%
2247
16th to endNight
56%311%19%7%
1893
March1st to 15thNight
52%411%18%10%1
2088
16th to endNight
48%5%11%23%10%1
2112
April1st to 15thNight
49%411%20%13%
1806
16th to endNight
44%311%19%17%3
1620
May1st to 15thNight
48%310%22%11%2
1620
16th to endNight
38%413%24%15%3
1658
June1st to 15thNight
34%5%13%28%15%1
1440
16th to endNight
33%5%16%26%17%
1440
July1st to 15thNight
30%5%9%30%20%2
1360
16th to endNight
28%416%26%20%3
1486
August1st to 15thNight
31%5%12%32%15%2
1609
16th to endNight
32%5%10%28%18%3
1755
September1st to 15thNight
32%310%30%21%1
1917
16th to endNight
36%412%28%18%
1858
October1st to 15thNight
42%5%11%22%17%1
1886
16th to endNight
52%412%22%8%
2218
November1st to 15thNight
44%412%23%13%1
2276
16th to endNight
55%413%19%6%
2343
December1st to 15thNight
63%412%13%5%
2558
16th to endNight
69%410%11%3
2703

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
18%16%38%20%5%
90
16th to endDay
31%10%38%15%4
96
February1st to 15thDay
21%23%42%10%3
90
16th to endDay
23%12%39%20%3
81
March1st to 15thDay
27%11%33%20%6%
162
16th to endDay
25%6%32%23%8%2
288
April1st to 15thDay
25%7%31%24%9%2
270
16th to endDay
17%11%31%19%12%7%
270
May1st to 15thDay
24%9%26%19%13%5%
288
16th to endDay
16%9%24%24%18%7%
354
June1st to 15thDay
12%430%29%16%5%
495
16th to endDay
11%6%32%27%16%5%
495
July1st to 15thDay
9%5%23%28%22%10%
475
16th to endDay
8%320%30%24%11%
440
August1st to 15thDay
9%215%27%22%21%
313
16th to endDay
15%316%19%28%16%
332
September1st to 15thDay
11%417%20%26%19%
315
16th to endDay
15%315%22%28%13%
266
October1st to 15thDay
16%5%24%29%17%6%
255
16th to endDay
27%5%34%25%7%
165
November1st to 15thDay
8%16%25%31%15%2
90
16th to endDay
23%19%38%14%4
89
December1st to 15thDay
21%20%35%18%5%
60
16th to endDay
25%27%38%7%
93
January1st to 15thNight
28%12%35%18%5%
900
16th to endNight
20%10%35%27%5%
876
February1st to 15thNight
25%12%35%23%3
704
16th to endNight
22%12%32%29%4
631
March1st to 15thNight
23%12%31%26%6%
720
16th to endNight
17%11%31%28%8%1
768
April1st to 15thNight
22%11%33%25%6%
572
16th to endNight
20%7%34%26%10%1
540
May1st to 15thNight
21%5%27%33%10%1
540
16th to endNight
14%326%35%18%2
563
June1st to 15thNight
10%322%46%17%
540
16th to endNight
9%220%47%20%
540
July1st to 15thNight
10%115%39%29%3
510
16th to endNight
5%215%47%25%2
564
August1st to 15thNight
7%16%45%26%3
539
16th to endNight
12%213%35%31%5%
573
September1st to 15thNight
14%318%29%28%5%
657
16th to endNight
13%317%31%28%5%
673
October1st to 15thNight
18%5%24%32%16%2
660
16th to endNight
26%10%30%24%6%
704
November1st to 15thNight
19%10%29%26%12%1
700
16th to endNight
25%11%31%23%7%
720
December1st to 15thNight
26%13%34%21%4
758
16th to endNight
29%10%34%21%3
960
Page generated at 2017-09-20 04:49:56. Version ac04

Copyright 2017 A. Danko


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