Caribou
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caribou clear sky chart from 2005-11-06 to 2024-01-16.

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
23%
23907
10%
74644
5%
23843
28%
23843
13%
56932

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
9%
850
7%
2649
1%
847
15%
847
7%
2190
January11th to 20thNight
13%
829
6%
2601
2%
829
17%
829
8%
2153
January21st to endNight
17%
812
11%
2619
4%
812
25%
812
10%
2028
February1st to 10thNight
16%
720
10%
2340
3%
720
23%
720
9%
1803
February11th to 20thNight
13%
703
8%
2276
2%
700
21%
700
8%
1817
February21st to endNight
21%
592
13%
1857
4%
592
29%
592
13%
1383
March1st to 10thNight
16%
718
12%
2064
4%
718
24%
718
11%
1660
March11th to 20thNight
23%
720
12%
1980
5%
720
28%
720
14%
1532
March21st to endNight
23%
747
12%
2133
5%
747
30%
747
13%
1650
April1st to 10thNight
19%
540
10%
1800
5%
540
25%
540
10%
1383
April11th to 20thNight
24%
534
14%
1761
7%
534
32%
534
15%
1266
April21st to endNight
25%
540
12%
1620
7%
540
29%
540
14%
1244
May1st to 10thNight
27%
540
13%
1472
7%
540
31%
540
15%
1126
May11th to 20thNight
29%
532
14%
1417
7%
532
35%
532
20%
1046
May21st to endNight
26%
583
10%
1551
4%
582
31%
582
20%
1139
June1st to 10thNight
29%
540
7%
1440
4%
540
31%
540
16%
1114
June11th to 20thNight
35%
540
11%
1440
6%
540
39%
540
22%
1024
June21st to endNight
37%
385
7%
1285
4%
385
40%
385
15%
937
July1st to 10thNight
44%
498
8%
1373
5%
498
46%
498
24%
957
July11th to 20thNight
44%
522
10%
1392
7%
522
46%
522
25%
981
July21st to endNight
45%
590
10%
1486
8%
558
46%
558
21%
1094
August1st to 10thNight
49%
538
11%
1554
10%
534
49%
534
25%
1061
August11th to 20thNight
41%
532
12%
1596
7%
532
45%
532
18%
1154
August21st to endNight
48%
594
14%
1918
11%
594
53%
594
22%
1252
September1st to 10thNight
41%
540
15%
1800
12%
540
47%
540
23%
1143
September11th to 20thNight
38%
540
19%
1800
16%
540
45%
540
21%
1175
September21st to endNight
31%
706
16%
2074
9%
706
37%
706
21%
1412
October1st to 10thNight
30%
720
15%
2160
8%
720
37%
720
20%
1484
October11th to 20thNight
25%
720
14%
2160
6%
720
31%
720
16%
1542
October21st to endNight
14%
825
11%
2442
4%
825
20%
825
10%
1951
November1st to 10thNight
15%
830
10%
2511
3%
830
20%
830
11%
1958
November11th to 20thNight
14%
850
9%
2660
4%
850
19%
850
8%
2134
November21st to endNight
12%
850
5%
2660
2%
850
15%
850
7%
2172
December1st to 10thNight
8%
850
5%
2660
0%
850
12%
850
6%
2253
December11th to 20thNight
6%
850
4%
3244
0%
849
10%
849
3%
2827
December21st to endNight
7%
927
2%
4849
0%
907
11%
907
3%
3887

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
18%10%48%6%35%5%5%7%29%
74894
Night
20%12%5%9%6%3445%6%26%
74898
TransparencyDay
55%8%13%16%7%1
74597
Night
57%7%12%16%6%1
74730
SeeingDay
24%15%30%22%7%1
16348
Night
25%15%30%23%6%1
23917

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
18%16%8%13%7%46%43417%
1516
11th to 20thDay
19%16%6%13%8%5%4445%16%
1481
21st to endDay
12%11%7%13%9%45%5%5%6%24%
1732
February1st to 10thDay
17%13%5%8%7%47%5%46%24%
1620
11th to 20thDay
17%14%5%8%7%45%5%5%5%26%
1573
21st to endDay
10%11%6%8%6%36%6%6%8%31%
1398
March1st to 10thDay
14%13%48%7%47%5%5%6%27%
1890
11th to 20thDay
13%10%6%9%8%46%5%47%28%
1980
21st to endDay
17%15%6%8%7%3433429%
2222
April1st to 10thDay
19%12%5%7%6%4445%7%29%
2160
11th to 20thDay
22%9%35%5%3445%7%33%
2147
21st to endDay
21%12%46%5%3446%6%29%
2340
May1st to 10thDay
24%10%36%6%3445%7%27%
2488
11th to 20thDay
19%8%35%6%445%6%7%33%
2478
21st to endDay
20%8%36%5%35%45%8%33%
2724
June1st to 10thDay
25%8%35%5%36%6%6%8%25%
2520
11th to 20thDay
20%8%36%43445%8%35%
2520
21st to endDay
20%7%37%6%45%5%6%6%31%
2675
July1st to 10thDay
13%5%25%5%35%6%6%9%39%
2520
11th to 20thDay
13%6%35%6%35%5%7%9%38%
2520
21st to endDay
16%8%36%5%45%6%6%8%32%
2745
August1st to 10thDay
12%6%36%5%445%7%9%40%
2371
11th to 20thDay
16%6%25%5%35%5%6%8%37%
2304
21st to endDay
14%5%25%6%35%46%8%43%
2437
September1st to 10thDay
16%5%35%6%3445%8%41%
2160
11th to 20thDay
17%8%25%5%4445%7%38%
2160
21st to endDay
17%7%35%6%235%5%7%39%
1884
October1st to 10thDay
19%9%25%5%345%5%7%35%
1800
11th to 20thDay
20%10%48%7%35%5%5%7%25%
1800
21st to endDay
21%16%47%7%35%446%22%
1913
November1st to 10thDay
21%16%5%7%6%35%5%5%6%22%
1567
11th to 20thDay
19%19%6%9%7%3345%5%19%
1520
21st to endDay
18%18%7%12%8%34446%16%
1520
December1st to 10thDay
22%17%10%13%7%345%4411%
1520
11th to 20thDay
24%18%8%15%8%444448%
1906
21st to endDay
20%15%9%14%7%3433417%
2783
January1st to 10thNight
18%16%8%13%7%3443418%
2649
11th to 20thNight
17%14%6%15%8%44446%17%
2601
21st to endNight
14%12%7%10%7%45%5%5%6%25%
2619
February1st to 10thNight
19%12%5%9%6%45%445%25%
2340
11th to 20thNight
17%14%5%10%9%45%346%21%
2273
21st to endNight
11%16%7%9%6%3435%5%30%
1857
March1st to 10thNight
15%15%6%11%8%45%34424%
2055
11th to 20thNight
16%10%7%9%7%35%446%28%
1979
21st to endNight
19%13%6%8%6%24445%28%
2133
April1st to 10thNight
23%12%48%6%35%45%6%25%
1800
11th to 20thNight
21%11%47%5%34446%31%
1761
21st to endNight
25%11%46%6%34446%28%
1620
May1st to 10thNight
30%8%36%5%23346%29%
1472
11th to 20thNight
23%8%37%6%34446%34%
1416
21st to endNight
17%10%46%5%446%48%33%
1550
June1st to 10thNight
26%8%46%6%3445%7%26%
1440
11th to 20thNight
22%6%35%5%2445%7%37%
1440
21st to endNight
22%6%37%6%45%5%5%7%31%
1285
July1st to 10thNight
14%6%36%6%35%5%7%9%37%
1412
11th to 20thNight
15%5%346%45%6%7%10%35%
1440
21st to endNight
16%7%36%5%46%7%8%9%30%
1573
August1st to 10thNight
14%6%25%5%46%6%7%8%38%
1565
11th to 20thNight
17%9%36%7%35%45%8%34%
1596
21st to endNight
15%5%35%5%45%6%6%9%38%
1918
September1st to 10thNight
13%6%36%6%35%46%8%40%
1800
11th to 20thNight
19%8%35%43445%6%41%
1800
21st to endNight
19%5%35%5%35%45%8%38%
2074
October1st to 10thNight
20%8%36%5%3436%6%37%
2160
11th to 20thNight
20%11%37%5%3446%7%30%
2160
21st to endNight
27%12%48%6%44445%22%
2442
November1st to 10thNight
20%15%48%5%35%446%25%
2511
11th to 20thNight
22%17%5%8%7%345%5%6%18%
2660
21st to endNight
22%18%6%10%6%34445%17%
2660
December1st to 10thNight
24%17%9%13%6%33445%11%
2660
11th to 20thNight
26%17%6%15%10%3423312%
3293
21st to endNight
28%16%6%13%5%2333417%
4884

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
69%8%11%9%3
1517
11th to 20thDay
70%8%9%8%5%
1481
21st to endDay
62%6%11%12%8%
1732
February1st to 10thDay
62%5%12%13%7%1
1620
11th to 20thDay
63%6%10%15%6%
1581
21st to endDay
54%8%13%16%8%1
1398
March1st to 10thDay
60%6%11%15%8%
1894
11th to 20thDay
58%8%11%15%7%2
1980
21st to endDay
63%49%14%8%2
2222
April1st to 10thDay
59%6%9%13%10%2
2160
11th to 20thDay
54%6%9%18%11%1
2147
21st to endDay
58%8%11%15%7%1
2340
May1st to 10thDay
58%8%10%15%8%1
2488
11th to 20thDay
51%8%11%20%9%
2482
21st to endDay
51%9%12%19%9%
2724
June1st to 10thDay
58%8%12%16%4
2520
11th to 20thDay
50%7%13%20%9%1
2520
21st to endDay
55%9%11%14%9%1
2675
July1st to 10thDay
42%11%17%21%9%
2450
11th to 20thDay
43%9%17%23%8%1
2444
21st to endDay
51%10%14%18%6%
2592
August1st to 10thDay
41%11%17%24%7%
2357
11th to 20thDay
47%10%15%20%8%
2304
21st to endDay
39%8%17%25%10%
2437
September1st to 10thDay
43%8%16%23%10%1
2160
11th to 20thDay
46%8%13%21%12%
2160
21st to endDay
46%7%11%24%11%
1884
October1st to 10thDay
48%7%14%21%10%
1800
11th to 20thDay
55%8%16%16%5%
1800
21st to endDay
62%6%12%14%5%1
1913
November1st to 10thDay
62%7%11%15%5%
1567
11th to 20thDay
64%8%14%11%4
1520
21st to endDay
64%9%15%10%2
1520
December1st to 10thDay
70%8%12%8%2
1520
11th to 20thDay
75%7%9%7%21
1905
21st to endDay
69%7%15%7%2
2783
January1st to 10thNight
67%7%10%12%3
2649
11th to 20thNight
67%7%11%10%4
2601
21st to endNight
60%7%11%15%6%
2619
February1st to 10thNight
61%6%10%14%8%1
2340
11th to 20thNight
65%6%10%13%6%1
2276
21st to endNight
57%5%11%18%8%1
1857
March1st to 10thNight
64%5%8%13%8%1
2064
11th to 20thNight
57%7%10%16%7%2
1980
21st to endNight
59%6%9%16%9%2
2133
April1st to 10thNight
61%7%10%12%8%2
1800
11th to 20thNight
54%6%9%18%12%1
1761
21st to endNight
59%7%9%15%10%
1620
May1st to 10thNight
58%6%8%18%9%1
1472
11th to 20thNight
52%6%9%24%8%1
1417
21st to endNight
50%7%16%19%7%1
1551
June1st to 10thNight
57%7%12%19%5%
1440
11th to 20thNight
47%7%12%19%14%
1440
21st to endNight
52%10%13%16%8%1
1285
July1st to 10thNight
41%11%20%21%7%
1373
11th to 20thNight
41%11%17%22%9%1
1392
21st to endNight
47%11%18%18%6%
1486
August1st to 10thNight
42%9%18%26%6%
1554
11th to 20thNight
47%11%15%21%6%
1596
21st to endNight
40%10%18%24%8%
1918
September1st to 10thNight
40%8%14%28%10%1
1800
11th to 20thNight
43%7%11%26%12%1
1800
21st to endNight
45%7%13%25%10%
2074
October1st to 10thNight
45%8%14%22%11%
2160
11th to 20thNight
49%8%14%24%4
2160
21st to endNight
62%7%9%15%7%
2442
November1st to 10thNight
59%7%13%15%6%
2511
11th to 20thNight
63%8%13%12%4
2660
21st to endNight
64%9%15%10%2
2660
December1st to 10thNight
70%7%12%9%2
2660
11th to 20thNight
74%6%8%8%2
3295
21st to endNight
70%5%13%9%2
4884

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
30%22%35%13%1
370
11th to 20thDay
26%27%28%16%31
356
21st to endDay
19%21%39%19%2
374
February1st to 10thDay
29%23%34%13%2
340
11th to 20thDay
28%26%27%15%4
336
21st to endDay
18%21%34%21%5%1
280
March1st to 10thDay
20%20%38%18%4
382
11th to 20thDay
20%20%34%20%41
420
21st to endDay
27%21%32%14%5%1
462
April1st to 10thDay
29%24%33%10%4
420
11th to 20thDay
25%25%29%17%41
412
21st to endDay
27%14%31%21%6%1
420
May1st to 10thDay
31%15%29%18%43
571
11th to 20thDay
21%12%31%26%9%1
624
21st to endDay
24%11%33%26%6%1
680
June1st to 10thDay
33%9%27%22%8%1
630
11th to 20thDay
22%9%32%29%8%1
630
21st to endDay
24%9%25%28%13%1
630
July1st to 10thDay
16%5%32%35%12%1
620
11th to 20thDay
15%6%29%33%16%1
618
21st to endDay
17%5%28%36%13%1
685
August1st to 10thDay
15%5%24%38%16%3
490
11th to 20thDay
22%7%25%29%13%4
439
21st to endDay
14%8%26%33%16%3
495
September1st to 10thDay
15%12%30%32%10%2
450
11th to 20thDay
24%13%27%24%10%1
450
21st to endDay
22%13%30%22%12%2
396
October1st to 10thDay
21%13%29%26%10%3
360
11th to 20thDay
25%18%26%21%9%1
360
21st to endDay
29%21%29%15%5%1
396
November1st to 10thDay
31%19%30%16%31
365
11th to 20thDay
33%23%28%13%21
370
21st to endDay
33%24%29%12%2
370
December1st to 10thDay
31%25%31%11%2
370
11th to 20thDay
38%24%27%10%1
370
21st to endDay
25%29%31%13%2
407
January1st to 10thNight
27%24%33%15%2
850
11th to 20thNight
26%21%32%18%3
829
21st to endNight
22%21%33%20%41
812
February1st to 10thNight
27%17%32%23%2
720
11th to 20thNight
26%22%31%16%4
703
21st to endNight
18%17%34%22%7%1
592
March1st to 10thNight
22%17%37%21%4
720
11th to 20thNight
21%16%30%24%9%
720
21st to endNight
27%15%29%23%6%1
747
April1st to 10thNight
30%17%27%21%6%
540
11th to 20thNight
26%14%30%22%7%1
534
21st to endNight
28%13%28%25%6%1
540
May1st to 10thNight
31%10%27%21%8%2
540
11th to 20thNight
26%7%31%28%7%1
532
21st to endNight
23%8%37%26%5%1
583
June1st to 10thNight
30%7%27%29%7%
540
11th to 20thNight
23%9%28%32%7%1
540
21st to endNight
22%6%29%32%10%1
385
July1st to 10thNight
15%5%27%41%11%
498
11th to 20thNight
16%5%27%39%13%
522
21st to endNight
17%5%26%38%13%1
590
August1st to 10thNight
15%327%39%15%1
538
11th to 20thNight
20%6%24%33%15%1
532
21st to endNight
14%7%24%39%16%1
594
September1st to 10thNight
15%9%29%36%10%1
540
11th to 20thNight
23%10%24%30%12%1
540
21st to endNight
23%10%32%27%6%2
706
October1st to 10thNight
24%11%30%25%10%1
720
11th to 20thNight
25%14%30%22%8%1
720
21st to endNight
33%19%29%15%3
825
November1st to 10thNight
30%20%30%15%41
830
11th to 20thNight
32%21%27%15%41
850
21st to endNight
34%21%27%16%2
850
December1st to 10thNight
32%23%31%11%4
850
11th to 20thNight
33%27%28%10%1
850
21st to endNight
33%24%28%13%21
935
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