Pickle Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Pickle Lake clear sky chart from 2005-11-06 to 2024-02-05.

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
27%
24464
8%
80874
5%
24366
31%
24366
12%
62295

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
19%
945
6%
4805
4%
926
24%
926
4%
4043
January11th to 20thNight
21%
940
5%
4686
2%
930
26%
930
5%
3820
January21st to endNight
22%
1040
5%
4876
4%
1023
26%
1023
5%
4083
February1st to 10thNight
27%
923
11%
2547
5%
923
32%
923
14%
2011
February11th to 20thNight
30%
878
11%
2274
5%
874
33%
874
16%
1777
February21st to endNight
30%
659
16%
1843
6%
659
38%
659
17%
1364
March1st to 10thNight
29%
720
13%
2160
7%
720
35%
720
15%
1615
March11th to 20thNight
24%
618
14%
2058
7%
618
34%
618
14%
1506
March21st to endNight
36%
594
21%
2026
18%
594
45%
594
19%
1351
April1st to 10thNight
30%
540
14%
1800
11%
540
37%
540
17%
1263
April11th to 20thNight
35%
533
16%
1739
9%
533
44%
533
20%
1181
April21st to endNight
33%
540
14%
1440
6%
540
38%
540
24%
1011
May1st to 10thNight
26%
540
9%
1440
3%
540
30%
540
17%
1083
May11th to 20thNight
32%
531
10%
1416
4%
531
36%
531
24%
989
May21st to endNight
29%
477
6%
1409
3%
475
33%
475
19%
1006
June1st to 10thNight
35%
360
2%
1080
1%
360
36%
360
20%
765
June11th to 20thNight
37%
360
0%
1080
0%
360
37%
360
23%
724
June21st to endNight
44%
360
0%
1080
0%
360
44%
360
25%
713
July1st to 10thNight
37%
368
2%
1068
2%
368
40%
368
25%
711
July11th to 20thNight
39%
522
4%
1218
3%
522
40%
522
29%
853
July21st to endNight
49%
591
9%
1463
6%
558
51%
558
28%
1000
August1st to 10thNight
45%
537
10%
1423
5%
534
47%
534
26%
986
August11th to 20thNight
46%
534
13%
1422
6%
534
50%
534
29%
961
August21st to endNight
39%
594
14%
1888
10%
594
45%
594
21%
1285
September1st to 10thNight
38%
540
15%
1800
11%
540
46%
540
24%
1147
September11th to 20thNight
29%
540
11%
1800
8%
540
35%
540
14%
1301
September21st to endNight
27%
715
10%
2023
6%
715
32%
715
19%
1481
October1st to 10thNight
24%
720
10%
2160
5%
720
29%
720
14%
1610
October11th to 20thNight
24%
720
9%
2232
6%
720
28%
720
11%
1773
October21st to endNight
19%
792
6%
2574
3%
792
23%
792
7%
2167
November1st to 10thNight
15%
898
7%
2564
2%
898
19%
898
9%
2146
November11th to 20thNight
13%
950
6%
2660
2%
950
16%
950
7%
2327
November21st to endNight
11%
950
4%
2850
2%
950
14%
950
5%
2519
December1st to 10thNight
14%
950
5%
2854
2%
950
17%
950
7%
2443
December11th to 20thNight
20%
950
8%
3704
4%
949
25%
949
6%
3010
December21st to endNight
19%
1035
3%
5412
2%
1026
23%
1026
4%
4270

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
15%12%5%9%7%46%5%5%6%26%
77584
Night
13%13%5%10%8%5%6%6%5%6%24%
81299
TransparencyDay
57%6%11%18%7%1
77272
Night
61%5%10%17%6%
81145
SeeingDay
21%15%32%22%8%2
14794
Night
20%11%32%26%9%1
24495

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 10thDay
7%12%6%14%12%8%13%6%6%5%10%
2131
11th to 20thDay
5%8%414%17%7%9%9%8%6%13%
2255
21st to endDay
12%20%7%17%8%6%7%6%6%49%
2783
February1st to 10thDay
412%5%11%8%6%10%11%8%6%19%
1506
11th to 20thDay
6%11%6%9%10%5%8%10%8%6%20%
1574
21st to endDay
310%6%13%10%48%6%8%7%25%
1412
March1st to 10thDay
9%12%6%8%10%5%5%6%5%6%27%
1798
11th to 20thDay
10%14%5%9%7%5%6%5%5%5%30%
1916
21st to endDay
12%12%48%8%46%45%6%30%
2330
April1st to 10thDay
12%12%49%7%3445%7%33%
2160
11th to 20thDay
15%13%5%7%6%44445%34%
2167
21st to endDay
13%11%47%6%35%45%7%35%
2520
May1st to 10thDay
17%13%5%8%6%45%5%5%6%26%
2520
11th to 20thDay
19%12%46%6%34446%31%
2479
21st to endDay
23%8%36%5%3445%6%33%
2863
June1st to 10thDay
21%8%47%7%35%6%6%7%26%
2880
11th to 20thDay
18%7%36%5%35%5%5%8%34%
2880
21st to endDay
16%8%37%7%46%6%5%8%31%
2880
July1st to 10thDay
16%6%36%6%36%5%6%9%35%
2858
11th to 20thDay
16%7%26%5%45%6%7%7%34%
2700
21st to endDay
14%7%26%6%46%5%6%8%35%
2766
August1st to 10thDay
14%6%26%6%47%5%7%8%34%
2507
11th to 20thDay
14%6%26%6%35%6%6%9%36%
2479
21st to endDay
19%7%36%5%346%5%6%34%
2467
September1st to 10thDay
18%9%37%6%35%5%47%32%
2160
11th to 20thDay
25%12%36%6%3335%7%28%
2147
21st to endDay
25%10%36%6%34446%29%
1930
October1st to 10thDay
22%18%5%7%5%2445%5%24%
1800
11th to 20thDay
20%20%6%10%7%35%435%18%
1728
21st to endDay
20%23%9%10%7%45%43312%
1782
November1st to 10thDay
17%23%9%11%8%3433315%
1510
11th to 20thDay
15%20%10%14%11%5%5%32313%
1519
21st to endDay
15%20%9%19%10%4442310%
1330
December1st to 10thDay
9%16%9%17%12%47%5%5%412%
1321
11th to 20thDay
11%14%7%15%8%45%7%6%5%18%
1436
21st to endDay
13%15%7%12%9%5%7%5%6%7%13%
2090
January1st to 10thNight
5%14%7%15%11%9%11%7%6%410%
4819
11th to 20thNight
6%8%5%15%17%8%8%9%8%411%
4713
21st to endNight
8%20%8%15%9%47%7%7%410%
4884
February1st to 10thNight
412%5%10%9%7%11%11%8%6%18%
2547
11th to 20thNight
7%13%5%7%8%5%11%10%8%7%20%
2273
21st to endNight
411%6%11%9%6%7%6%6%7%27%
1843
March1st to 10thNight
8%11%49%10%6%8%7%5%5%27%
2149
11th to 20thNight
10%13%6%8%9%46%5%5%5%30%
2057
21st to endNight
11%11%5%7%6%45%447%36%
2026
April1st to 10thNight
11%12%5%9%8%44445%34%
1800
11th to 20thNight
13%11%47%5%45%5%6%7%34%
1739
21st to endNight
12%11%5%8%6%35%45%5%37%
1440
May1st to 10thNight
17%12%5%7%6%445%5%6%28%
1440
11th to 20thNight
19%8%37%43335%7%38%
1416
21st to endNight
22%8%35%5%345%5%6%35%
1408
June1st to 10thNight
20%8%25%437%7%7%6%31%
1080
11th to 20thNight
16%7%38%5%25%5%5%7%38%
1080
21st to endNight
12%7%36%6%345%6%9%39%
1080
July1st to 10thNight
13%6%25%6%35%5%6%8%40%
1099
11th to 20thNight
15%6%25%5%345%5%9%40%
1260
21st to endNight
13%7%26%6%35%5%6%8%41%
1549
August1st to 10thNight
17%5%25%5%45%5%5%9%38%
1432
11th to 20thNight
11%5%26%6%345%6%8%42%
1422
21st to endNight
16%8%36%5%35%46%8%36%
1888
September1st to 10thNight
19%7%25%423446%43%
1800
11th to 20thNight
24%10%36%5%44446%31%
1800
21st to endNight
26%9%35%43345%6%33%
2023
October1st to 10thNight
22%14%46%434346%29%
2160
11th to 20thNight
21%17%48%7%3444423%
2232
21st to endNight
20%20%7%9%7%445%46%15%
2574
November1st to 10thNight
19%20%6%12%7%34445%17%
2564
11th to 20thNight
17%16%7%13%11%5%6%44414%
2660
21st to endNight
15%20%8%16%9%6%6%33411%
2850
December1st to 10thNight
9%15%7%16%12%6%7%6%4315%
2854
11th to 20thNight
9%15%6%15%10%6%8%7%5%5%15%
3761
21st to endNight
10%14%9%13%10%6%7%5%45%18%
5577

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
75%410%10%2
2132
11th to 20thDay
69%5%9%14%3
2255
21st to endDay
78%46%8%5%
2783
February1st to 10thDay
59%6%9%18%8%
1506
11th to 20thDay
58%6%12%18%7%1
1583
21st to endDay
56%49%18%12%
1412
March1st to 10thDay
56%5%9%19%9%1
1800
11th to 20thDay
57%5%10%16%10%1
1916
21st to endDay
53%5%10%19%11%2
2330
April1st to 10thDay
51%411%20%13%1
2160
11th to 20thDay
54%49%19%13%2
2167
21st to endDay
49%5%10%21%14%2
2520
May1st to 10thDay
57%6%10%16%10%1
2520
11th to 20thDay
55%5%8%21%10%1
2483
21st to endDay
52%6%9%19%13%1
2863
June1st to 10thDay
55%8%10%16%10%1
2880
11th to 20thDay
47%7%11%21%13%1
2880
21st to endDay
49%8%13%19%10%1
2880
July1st to 10thDay
44%8%13%27%8%1
2780
11th to 20thDay
45%10%16%22%8%
2619
21st to endDay
45%8%15%25%6%
2612
August1st to 10thDay
44%10%18%23%4
2492
11th to 20thDay
43%9%17%23%8%
2479
21st to endDay
49%7%17%21%6%1
2467
September1st to 10thDay
51%7%14%21%7%1
2160
11th to 20thDay
57%6%15%19%3
2147
21st to endDay
57%5%14%19%5%
1930
October1st to 10thDay
62%6%13%16%21
1800
11th to 20thDay
69%5%10%13%2
1728
21st to endDay
78%5%8%8%1
1782
November1st to 10thDay
76%49%8%2
1510
11th to 20thDay
78%48%8%2
1519
21st to endDay
81%45%6%3
1330
December1st to 10thDay
74%47%11%4
1321
11th to 20thDay
65%49%14%8%
1436
21st to endDay
69%48%15%4
2090
January1st to 10thNight
74%5%9%10%2
4819
11th to 20thNight
71%5%10%11%2
4713
21st to endNight
74%5%8%9%4
4884
February1st to 10thNight
62%5%9%17%7%1
2547
11th to 20thNight
59%6%12%17%7%
2274
21st to endNight
56%49%21%10%
1843
March1st to 10thNight
57%5%10%17%9%1
2160
11th to 20thNight
57%5%10%20%7%1
2058
21st to endNight
49%48%22%15%2
2026
April1st to 10thNight
53%47%20%14%2
1800
11th to 20thNight
48%5%9%22%16%1
1739
21st to endNight
48%410%18%16%3
1440
May1st to 10thNight
54%6%9%18%12%
1440
11th to 20thNight
47%5%9%23%14%2
1417
21st to endNight
51%6%7%20%14%2
1409
June1st to 10thNight
49%7%13%20%11%
1080
11th to 20thNight
45%5%12%23%14%1
1080
21st to endNight
41%8%14%27%10%1
1080
July1st to 10thNight
39%9%12%25%13%1
1068
11th to 20thNight
40%8%11%30%9%1
1218
21st to endNight
40%8%12%30%9%1
1463
August1st to 10thNight
42%9%18%26%5%
1423
11th to 20thNight
37%10%18%27%8%
1422
21st to endNight
45%8%17%22%8%
1888
September1st to 10thNight
42%6%15%29%8%1
1800
11th to 20thNight
55%6%14%22%3
1800
21st to endNight
52%6%15%20%6%
2023
October1st to 10thNight
56%6%15%18%5%
2160
11th to 20thNight
64%6%13%15%2
2232
21st to endNight
70%7%11%10%1
2574
November1st to 10thNight
70%5%12%9%3
2564
11th to 20thNight
75%5%9%9%2
2660
21st to endNight
79%48%7%3
2850
December1st to 10thNight
74%5%7%10%4
2854
11th to 20thNight
69%48%15%3
3760
21st to endNight
69%47%16%4
5577

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
16%17%37%27%3
247
11th to 20thDay
12%11%35%29%11%2
270
21st to endDay
18%12%38%22%8%2
297
February1st to 10thDay
12%15%44%25%4
252
11th to 20thDay
12%20%42%21%42
240
21st to endDay
8%18%44%20%8%2
198
March1st to 10thDay
13%17%36%24%8%2
240
11th to 20thDay
20%15%42%15%6%1
240
21st to endDay
17%16%31%25%8%3
416
April1st to 10thDay
19%16%32%25%7%1
420
11th to 20thDay
25%13%27%23%10%2
422
21st to endDay
19%15%34%20%9%2
600
May1st to 10thDay
25%16%29%22%7%1
603
11th to 20thDay
26%13%32%21%6%2
625
21st to endDay
28%15%30%19%7%
679
June1st to 10thDay
25%16%28%20%8%2
630
11th to 20thDay
19%17%33%19%9%2
630
21st to endDay
18%15%32%23%10%3
630
July1st to 10thDay
17%15%33%26%8%2
621
11th to 20thDay
17%13%34%24%9%3
618
21st to endDay
14%11%32%25%15%4
684
August1st to 10thDay
17%9%34%27%11%2
626
11th to 20thDay
17%14%27%25%13%4
615
21st to endDay
26%10%29%23%10%2
577
September1st to 10thDay
24%12%32%24%8%1
450
11th to 20thDay
30%14%27%21%7%1
450
21st to endDay
30%12%26%24%6%2
400
October1st to 10thDay
30%12%29%20%7%1
270
11th to 20thDay
24%18%31%20%6%1
270
21st to endDay
35%15%32%13%41
297
November1st to 10thDay
31%17%32%16%4
270
11th to 20thDay
24%19%30%20%5%1
269
21st to endDay
25%26%26%17%5%1
180
December1st to 10thDay
17%16%41%22%41
180
11th to 20thDay
16%18%42%19%41
180
21st to endDay
18%15%36%19%8%5%
198
January1st to 10thNight
13%13%41%25%7%1
950
11th to 20thNight
17%12%35%28%8%1
950
21st to endNight
16%10%36%26%11%1
1045
February1st to 10thNight
10%11%41%30%7%1
923
11th to 20thNight
14%10%37%27%10%1
879
21st to endNight
9%11%34%30%13%2
659
March1st to 10thNight
13%13%32%28%13%1
720
11th to 20thNight
18%12%38%25%6%2
618
21st to endNight
17%14%27%28%12%2
594
April1st to 10thNight
17%13%31%30%9%1
540
11th to 20thNight
18%11%29%31%9%2
533
21st to endNight
18%8%34%29%10%1
540
May1st to 10thNight
24%10%34%26%5%
540
11th to 20thNight
23%10%30%26%10%1
531
21st to endNight
27%8%32%27%6%
477
June1st to 10thNight
23%6%33%28%10%1
360
11th to 20thNight
19%10%30%29%11%1
360
21st to endNight
16%6%28%37%13%1
360
July1st to 10thNight
13%10%35%28%14%1
368
11th to 20thNight
17%7%32%30%12%1
522
21st to endNight
15%6%23%38%17%2
591
August1st to 10thNight
19%6%25%37%12%
537
11th to 20thNight
13%8%27%30%19%2
534
21st to endNight
20%8%30%30%13%
594
September1st to 10thNight
23%7%27%31%11%1
540
11th to 20thNight
30%11%26%24%9%1
540
21st to endNight
30%9%30%22%8%1
715
October1st to 10thNight
30%12%28%22%7%1
720
11th to 20thNight
31%12%24%25%8%1
720
21st to endNight
30%12%28%22%6%1
792
November1st to 10thNight
30%12%31%19%6%1
898
11th to 20thNight
28%10%36%19%6%1
950
21st to endNight
26%19%31%17%5%1
950
December1st to 10thNight
15%15%40%22%7%1
950
11th to 20thNight
18%14%34%25%8%1
950
21st to endNight
20%12%32%24%9%3
1045
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