Pickerel Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pickerel Lake clear sky chart from 2005-11-06 to 2024-01-12.

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
34%
24889
18%
74754
9%
24829
42%
24829
25%
48538

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 10thNight
23%
950
15%
2795
5%
946
34%
946
20%
1948
January11th to 20thNight
24%
908
12%
2541
5%
908
30%
908
17%
1892
January21st to endNight
18%
990
15%
2681
3%
990
27%
990
16%
2020
February1st to 10thNight
27%
900
13%
2340
4%
900
33%
900
20%
1697
February11th to 20thNight
26%
879
17%
2274
6%
875
34%
875
24%
1601
February21st to endNight
28%
602
18%
1786
5%
602
40%
602
21%
1263
March1st to 10thNight
25%
653
14%
2093
6%
653
33%
653
20%
1425
March11th to 20thNight
27%
540
19%
1980
11%
540
39%
540
19%
1285
March21st to endNight
36%
594
15%
2178
13%
594
42%
594
18%
1442
April1st to 10thNight
30%
540
17%
1859
11%
540
41%
540
23%
1176
April11th to 20thNight
33%
533
21%
1599
15%
533
43%
533
21%
1098
April21st to endNight
32%
540
15%
1620
11%
540
37%
540
22%
1104
May1st to 10thNight
37%
540
16%
1620
10%
540
43%
540
26%
1034
May11th to 20thNight
40%
531
16%
1528
8%
531
45%
531
29%
976
May21st to endNight
42%
584
13%
1449
5%
582
44%
582
32%
969
June1st to 10thNight
52%
540
18%
1260
6%
540
56%
540
42%
790
June11th to 20thNight
44%
540
15%
1260
5%
540
48%
540
41%
799
June21st to endNight
55%
540
19%
1260
7%
540
58%
540
51%
733
July1st to 10thNight
62%
525
18%
1225
9%
525
64%
525
55%
692
July11th to 20thNight
60%
522
24%
1293
9%
522
64%
522
61%
676
July21st to endNight
62%
591
21%
1556
11%
558
65%
558
50%
817
August1st to 10thNight
62%
537
21%
1601
16%
534
65%
534
40%
892
August11th to 20thNight
59%
534
24%
1600
20%
534
66%
534
41%
881
August21st to endNight
56%
594
31%
1782
28%
594
65%
594
52%
878
September1st to 10thNight
49%
540
24%
1820
21%
540
60%
540
40%
928
September11th to 20thNight
48%
540
26%
1980
21%
540
60%
540
32%
1042
September21st to endNight
38%
540
27%
1980
16%
540
53%
540
30%
1059
October1st to 10thNight
36%
638
21%
2078
15%
638
43%
638
26%
1266
October11th to 20thNight
29%
720
23%
2160
9%
720
39%
720
27%
1320
October21st to endNight
27%
940
23%
2524
8%
940
37%
940
27%
1662
November1st to 10thNight
29%
925
23%
2407
9%
925
38%
925
27%
1597
November11th to 20thNight
29%
950
19%
2660
8%
950
38%
950
23%
1824
November21st to endNight
23%
950
19%
2660
8%
950
33%
950
24%
1763
December1st to 10thNight
22%
950
13%
2712
4%
950
30%
950
19%
1936
December11th to 20thNight
21%
949
11%
3458
4%
949
30%
949
14%
2318
December21st to endNight
16%
1040
9%
5135
4%
1026
26%
1026
8%
3735

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
11%8%37%6%35%5%6%8%40%
74642
Night
9%8%47%6%35%5%5%7%40%
75077
TransparencyDay
43%5%14%25%12%1
74339
Night
42%5%14%24%13%2
74903
SeeingDay
15%11%32%29%12%2
14850
Night
13%10%36%31%9%1
24895

By Month

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 10thDay
7%10%5%9%8%47%6%8%10%27%
1366
11th to 20thDay
7%12%5%9%8%46%8%7%9%24%
1448
21st to endDay
7%11%5%13%12%5%7%5%7%8%19%
1674
February1st to 10thDay
8%10%410%8%5%7%6%7%9%27%
1620
11th to 20thDay
7%8%5%11%8%5%7%7%5%7%28%
1578
21st to endDay
7%11%411%7%6%8%5%5%7%29%
1480
March1st to 10thDay
11%11%5%10%9%45%5%6%7%27%
1866
11th to 20thDay
11%11%48%6%345%5%7%34%
1980
21st to endDay
13%12%6%10%9%4446%7%25%
2178
April1st to 10thDay
15%9%45%5%245%47%39%
2096
11th to 20thDay
18%13%5%7%5%34346%32%
2309
21st to endDay
18%11%46%5%3445%6%35%
2340
May1st to 10thDay
15%10%47%6%35%45%6%35%
2340
11th to 20thDay
15%8%25%5%25%47%8%39%
2363
21st to endDay
15%6%35%5%35%6%6%9%38%
2824
June1st to 10thDay
11%5%25%5%35%5%7%9%43%
2700
11th to 20thDay
12%6%26%5%346%5%9%42%
2700
21st to endDay
8%425%5%35%5%7%8%48%
2700
July1st to 10thDay
6%424435%5%7%10%52%
2700
11th to 20thDay
5%21342446%8%60%
2622
21st to endDay
5%315%435%6%7%9%51%
2668
August1st to 10thDay
8%6%246%45%6%6%8%44%
2328
11th to 20thDay
11%425%5%35%5%6%8%47%
2301
21st to endDay
9%424423447%58%
2574
September1st to 10thDay
11%5%2442445%6%53%
2137
11th to 20thDay
10%5%245%25%46%8%50%
1980
21st to endDay
14%7%24423446%49%
1980
October1st to 10thDay
14%7%37%434447%44%
1864
11th to 20thDay
14%8%45%434446%45%
1800
21st to endDay
13%10%46%5%2345%7%41%
1829
November1st to 10thDay
12%10%5%7%6%3335%7%39%
1669
11th to 20thDay
9%10%410%9%45%45%5%33%
1520
21st to endDay
9%10%48%8%45%45%8%35%
1520
December1st to 10thDay
7%10%410%10%5%7%7%6%6%28%
1463
11th to 20thDay
8%10%5%8%7%5%6%6%7%9%28%
1683
21st to endDay
16%12%5%11%7%34445%29%
2442
January1st to 10thNight
6%9%48%7%5%6%7%8%10%30%
2795
11th to 20thNight
7%11%6%11%9%46%7%7%8%25%
2541
21st to endNight
7%10%5%11%9%5%7%6%7%7%25%
2681
February1st to 10thNight
6%9%5%8%8%5%8%8%6%7%30%
2340
11th to 20thNight
6%9%5%8%7%47%7%7%7%34%
2273
21st to endNight
9%9%5%8%8%45%6%5%7%32%
1786
March1st to 10thNight
8%10%5%10%8%45%5%5%8%32%
2093
11th to 20thNight
12%10%47%8%3445%6%37%
1980
21st to endNight
11%9%5%7%7%35%5%6%8%33%
2178
April1st to 10thNight
13%10%36%435%5%5%8%38%
1859
11th to 20thNight
18%8%47%6%24446%37%
1599
21st to endNight
16%11%37%5%26%446%37%
1620
May1st to 10thNight
13%6%36%6%345%5%6%43%
1620
11th to 20thNight
12%7%345%35%5%6%8%43%
1528
21st to endNight
11%7%345%35%5%7%9%40%
1448
June1st to 10thNight
10%4243246%7%9%48%
1260
11th to 20thNight
8%425%5%345%6%9%49%
1260
21st to endNight
7%32332345%7%60%
1260
July1st to 10thNight
5%3123235%6%9%60%
1260
11th to 20thNight
321222335%9%68%
1335
21st to endNight
431344345%8%60%
1648
August1st to 10thNight
6%324435%6%6%8%53%
1611
11th to 20thNight
8%424424448%57%
1600
21st to endNight
6%323323347%66%
1782
September1st to 10thNight
9%323423436%61%
1820
11th to 20thNight
8%5%25%42345%6%55%
1980
21st to endNight
12%5%243235%45%55%
1980
October1st to 10thNight
14%6%25%4345%5%6%46%
2078
11th to 20thNight
13%7%36%433446%47%
2160
21st to endNight
12%9%36%5%2435%7%43%
2524
November1st to 10thNight
9%8%46%6%35%5%5%6%43%
2407
11th to 20thNight
8%8%49%8%445%5%7%38%
2660
21st to endNight
8%8%37%8%4446%8%40%
2660
December1st to 10thNight
6%10%5%9%8%5%6%6%6%8%31%
2712
11th to 20thNight
9%10%49%7%47%6%6%7%31%
3514
21st to endNight
15%13%6%11%8%34446%25%
5225

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 10thDay
49%7%16%18%9%1
1367
11th to 20thDay
54%6%15%17%8%1
1448
21st to endDay
61%6%13%14%6%
1674
February1st to 10thDay
53%5%12%20%9%1
1620
11th to 20thDay
52%5%12%21%8%2
1587
21st to endDay
54%6%13%16%10%1
1480
March1st to 10thDay
55%5%13%18%7%1
1866
11th to 20thDay
50%412%24%9%1
1980
21st to endDay
58%5%15%17%5%1
2178
April1st to 10thDay
45%5%13%24%13%1
2096
11th to 20thDay
53%410%20%12%1
2312
21st to endDay
50%413%25%8%
2340
May1st to 10thDay
49%412%22%12%1
2340
11th to 20thDay
42%5%15%26%11%1
2367
21st to endDay
42%5%17%24%11%1
2824
June1st to 10thDay
36%5%18%30%10%1
2700
11th to 20thDay
38%5%15%27%12%2
2700
21st to endDay
32%5%19%30%12%1
2700
July1st to 10thDay
26%5%18%33%17%1
2626
11th to 20thDay
23%5%16%32%20%4
2541
21st to endDay
28%5%17%29%18%2
2520
August1st to 10thDay
36%5%16%26%13%4
2314
11th to 20thDay
33%5%16%33%11%2
2301
21st to endDay
27%414%33%18%4
2574
September1st to 10thDay
31%5%13%34%16%1
2137
11th to 20thDay
33%319%33%11%1
1980
21st to endDay
37%312%30%16%1
1980
October1st to 10thDay
41%315%26%13%1
1864
11th to 20thDay
41%411%28%14%2
1800
21st to endDay
44%414%26%12%1
1829
November1st to 10thDay
45%412%22%14%3
1669
11th to 20thDay
52%5%13%19%10%1
1520
21st to endDay
48%5%15%22%8%2
1520
December1st to 10thDay
55%7%13%16%8%1
1463
11th to 20thDay
51%5%18%20%6%1
1680
21st to endDay
60%39%21%7%1
2442
January1st to 10thNight
47%7%13%21%12%
2795
11th to 20thNight
54%6%13%16%9%2
2541
21st to endNight
55%6%12%16%10%1
2681
February1st to 10thNight
50%5%12%19%12%1
2340
11th to 20thNight
46%6%13%22%11%3
2274
21st to endNight
49%6%10%20%12%3
1786
March1st to 10thNight
49%415%22%9%1
2093
11th to 20thNight
47%49%24%14%1
1980
21st to endNight
48%5%16%22%7%2
2178
April1st to 10thNight
43%5%12%28%12%1
1859
11th to 20thNight
49%48%24%14%3
1599
21st to endNight
49%411%26%10%1
1620
May1st to 10thNight
41%413%26%15%1
1620
11th to 20thNight
38%7%13%25%16%2
1529
21st to endNight
39%6%17%24%13%1
1449
June1st to 10thNight
30%419%31%14%2
1260
11th to 20thNight
31%5%19%26%15%3
1260
21st to endNight
23%420%31%19%2
1260
July1st to 10thNight
20%5%19%35%19%2
1225
11th to 20thNight
16%415%36%25%4
1293
21st to endNight
21%417%33%19%5%
1556
August1st to 10thNight
29%5%17%31%15%4
1601
11th to 20thNight
27%5%17%34%15%2
1600
21st to endNight
20%313%36%24%4
1782
September1st to 10thNight
26%314%33%22%2
1820
11th to 20thNight
31%414%31%18%1
1980
21st to endNight
32%412%30%20%2
1980
October1st to 10thNight
39%413%25%17%2
2078
11th to 20thNight
39%311%28%17%3
2160
21st to endNight
41%412%28%13%2
2524
November1st to 10thNight
41%5%12%21%18%3
2407
11th to 20thNight
46%5%14%19%13%2
2660
21st to endNight
43%5%16%24%11%1
2660
December1st to 10thNight
50%7%16%19%9%
2712
11th to 20thNight
50%5%19%19%6%1
3516
21st to endNight
61%49%17%9%
5225

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 10thDay
15%15%32%30%7%1
270
11th to 20thDay
11%14%37%31%6%
243
21st to endDay
15%14%43%21%7%
264
February1st to 10thDay
11%17%45%23%3
240
11th to 20thDay
15%16%44%17%7%1
240
21st to endDay
14%15%47%21%3
198
March1st to 10thDay
18%16%37%24%41
240
11th to 20thDay
14%12%37%27%8%3
240
21st to endDay
19%13%27%27%11%3
264
April1st to 10thDay
24%17%30%23%6%
356
11th to 20thDay
28%14%30%18%9%1
590
21st to endDay
21%11%34%23%10%2
600
May1st to 10thDay
19%10%33%28%9%1
603
11th to 20thDay
20%10%27%28%13%2
625
21st to endDay
18%8%29%32%11%3
679
June1st to 10thDay
9%9%25%33%21%3
630
11th to 20thDay
14%9%37%26%11%3
630
21st to endDay
12%7%31%34%14%2
630
July1st to 10thDay
7%427%35%22%5%
621
11th to 20thDay
6%7%32%35%16%3
618
21st to endDay
5%5%27%39%20%4
684
August1st to 10thDay
9%423%39%21%3
626
11th to 20thDay
12%5%27%33%19%4
615
21st to endDay
10%6%26%34%21%3
693
September1st to 10thDay
13%9%29%32%14%2
427
11th to 20thDay
11%6%36%31%13%3
270
21st to endDay
21%16%29%22%11%1
270
October1st to 10thDay
19%11%30%26%11%2
270
11th to 20thDay
15%18%34%26%6%1
270
21st to endDay
19%23%35%16%7%1
297
November1st to 10thDay
21%13%33%27%5%1
270
11th to 20thDay
17%19%38%21%41
270
21st to endDay
14%21%36%23%41
270
December1st to 10thDay
14%14%44%19%8%1
270
11th to 20thDay
12%18%42%24%3
270
21st to endDay
24%14%37%20%41
297
January1st to 10thNight
11%14%43%26%6%1
950
11th to 20thNight
12%13%41%29%41
908
21st to endNight
12%13%45%25%4
990
February1st to 10thNight
11%12%42%29%5%1
900
11th to 20thNight
10%13%44%25%6%1
879
21st to endNight
13%10%40%25%10%2
602
March1st to 10thNight
12%12%41%27%8%1
653
11th to 20thNight
16%9%40%28%7%
540
21st to endNight
14%9%31%31%12%2
594
April1st to 10thNight
17%11%38%28%6%
540
11th to 20thNight
20%12%30%26%11%1
533
21st to endNight
21%8%34%26%10%1
540
May1st to 10thNight
15%11%32%33%8%1
540
11th to 20thNight
15%7%33%35%10%
531
21st to endNight
14%6%32%35%12%1
584
June1st to 10thNight
11%7%26%38%18%1
540
11th to 20thNight
9%8%34%41%8%
540
21st to endNight
8%6%29%44%13%1
540
July1st to 10thNight
6%325%44%21%2
525
11th to 20thNight
4330%47%15%1
522
21st to endNight
4227%50%17%1
591
August1st to 10thNight
7%223%50%16%2
537
11th to 20thNight
10%323%42%18%3
534
21st to endNight
6%431%40%18%1
594
September1st to 10thNight
9%6%32%37%14%2
540
11th to 20thNight
9%9%31%35%14%2
540
21st to endNight
14%9%36%29%12%1
540
October1st to 10thNight
16%13%30%32%9%1
638
11th to 20thNight
18%16%35%24%8%
720
21st to endNight
19%14%36%26%5%
940
November1st to 10thNight
13%13%39%28%7%
925
11th to 20thNight
12%13%40%26%7%1
950
21st to endNight
12%14%44%26%4
950
December1st to 10thNight
11%13%44%24%7%
950
11th to 20thNight
16%13%40%26%41
950
21st to endNight
20%13%41%22%5%
1045
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