Dinosaur Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dinosaur Provincial Park clear sky chart from 2005-11-06 to 2024-03-01.

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
42%
23825
14%
80789
9%
23772
48%
23772
22%
51596

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
36%
932
13%
4680
6%
926
40%
926
12%
3164
January11th to 20thNight
36%
941
18%
4616
9%
929
43%
929
12%
3033
January21st to endNight
34%
906
10%
4944
8%
902
42%
902
12%
2900
February1st to 10thNight
43%
760
14%
2550
12%
760
48%
760
17%
1766
February11th to 20thNight
36%
741
13%
2403
10%
740
42%
740
17%
1720
February21st to endNight
48%
628
15%
2027
13%
628
53%
628
22%
1356
March1st to 10thNight
40%
722
15%
2107
11%
722
44%
722
21%
1472
March11th to 20thNight
39%
720
18%
1980
10%
720
46%
720
25%
1347
March21st to endNight
40%
792
10%
2178
5%
792
44%
792
20%
1587
April1st to 10thNight
36%
591
14%
1753
6%
591
43%
591
20%
1219
April11th to 20thNight
37%
533
16%
1601
9%
533
42%
533
21%
1106
April21st to endNight
43%
540
16%
1620
11%
540
48%
540
24%
1057
May1st to 10thNight
45%
540
11%
1486
8%
540
48%
540
25%
1013
May11th to 20thNight
51%
400
16%
1285
12%
400
55%
400
30%
757
May21st to endNight
43%
389
9%
1358
7%
388
47%
388
20%
896
June1st to 10thNight
45%
360
3%
1260
2%
360
47%
360
23%
801
June11th to 20thNight
40%
360
2%
1260
0%
360
40%
360
19%
833
June21st to endNight
55%
360
2%
1260
0%
360
55%
360
31%
698
July1st to 10thNight
60%
350
3%
1225
1%
350
61%
350
32%
661
July11th to 20thNight
56%
348
8%
1218
7%
348
58%
348
32%
664
July21st to endNight
64%
394
19%
1302
21%
372
71%
372
43%
609
August1st to 10thNight
60%
437
15%
1455
16%
435
64%
435
33%
804
August11th to 20thNight
60%
534
20%
1602
16%
534
65%
534
38%
896
August21st to endNight
59%
594
24%
1782
18%
594
64%
594
39%
996
September1st to 10thNight
54%
540
21%
1717
15%
540
59%
540
32%
1016
September11th to 20thNight
54%
698
21%
1958
15%
698
58%
698
35%
1177
September21st to endNight
46%
720
24%
1980
14%
720
55%
720
37%
1187
October1st to 10thNight
45%
720
22%
2134
13%
720
53%
720
29%
1336
October11th to 20thNight
43%
720
21%
2182
10%
720
53%
720
29%
1351
October21st to endNight
37%
800
17%
2582
10%
800
46%
800
21%
1684
November1st to 10thNight
33%
925
16%
2590
7%
925
40%
925
20%
1830
November11th to 20thNight
33%
950
17%
2660
7%
950
42%
950
24%
1811
November21st to endNight
36%
950
12%
2788
6%
950
41%
950
21%
1918
December1st to 10thNight
36%
950
13%
2850
8%
950
41%
950
18%
2047
December11th to 20thNight
33%
949
12%
3473
5%
949
40%
949
16%
2270
December21st to endNight
32%
1031
10%
4923
6%
1026
39%
1026
15%
2614

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
8%8%37%6%35%6%6%8%40%
77888
Night
7%8%47%7%46%5%6%8%38%
81477
TransparencyDay
40%7%16%25%11%1
77590
Night
42%7%15%23%11%2
81355
SeeingDay
11%7%25%31%20%6%
14466
Night
11%7%29%36%15%2
23888

By Month

Percentage Cloud Cover NW (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
411%5%11%9%5%7%6%7%10%26%
2219
11th to 20thDay
5%8%49%10%48%12%8%7%27%
2199
21st to endDay
410%48%6%47%6%7%8%38%
2670
February1st to 10thDay
9%13%6%11%7%45%6%6%8%25%
1629
11th to 20thDay
8%13%5%11%7%46%7%8%7%23%
1665
21st to endDay
413%6%11%8%5%7%6%5%8%27%
1425
March1st to 10thDay
6%10%6%11%9%5%6%6%5%7%28%
1859
11th to 20thDay
7%10%48%6%46%7%6%9%33%
1979
21st to endDay
9%10%5%9%8%45%5%5%8%32%
2178
April1st to 10thDay
8%9%49%7%5%6%6%6%8%32%
2205
11th to 20thDay
10%10%5%7%6%36%6%6%9%33%
2310
21st to endDay
10%8%47%7%46%5%7%9%34%
2340
May1st to 10thDay
11%10%36%7%35%6%7%8%34%
2473
11th to 20thDay
9%5%36%5%35%5%7%9%43%
2606
21st to endDay
18%8%36%5%3445%7%35%
2917
June1st to 10thDay
14%6%36%6%36%6%7%8%36%
2700
11th to 20thDay
17%6%36%6%35%6%7%9%32%
2700
21st to endDay
8%325%5%346%7%10%47%
2700
July1st to 10thDay
6%3245%36%5%7%10%49%
2700
11th to 20thDay
7%4234245%7%9%52%
2700
21st to endDay
421332446%10%61%
2938
August1st to 10thDay
6%42443445%8%56%
2473
11th to 20thDay
7%3234345%7%9%53%
2299
21st to endDay
7%42432446%9%55%
2574
September1st to 10thDay
11%6%2442445%7%52%
2242
11th to 20thDay
14%6%25%43335%8%47%
1998
21st to endDay
8%7%25%5%245%6%8%49%
1980
October1st to 10thDay
11%8%37%5%345%5%6%44%
1825
11th to 20thDay
8%6%36%6%46%6%6%7%43%
1778
21st to endDay
9%8%37%6%35%6%7%9%37%
1756
November1st to 10thDay
12%13%5%10%6%5%5%5%6%7%28%
1488
11th to 20thDay
6%11%5%9%8%46%5%6%6%35%
1520
21st to endDay
6%10%6%8%7%45%5%6%10%34%
1389
December1st to 10thDay
8%10%6%9%9%5%6%8%6%7%26%
1330
11th to 20thDay
412%410%8%5%6%6%6%8%30%
1682
21st to endDay
48%47%6%45%5%5%7%46%
2442
January1st to 10thNight
411%5%10%10%6%6%6%7%9%26%
4726
11th to 20thNight
5%7%5%11%9%47%6%7%8%31%
4699
21st to endNight
49%49%7%36%6%6%7%38%
5015
February1st to 10thNight
7%11%5%9%8%5%6%6%6%7%31%
2550
11th to 20thNight
7%11%410%8%47%6%6%7%28%
2402
21st to endNight
5%8%49%7%47%6%8%9%33%
2027
March1st to 10thNight
5%9%410%8%46%7%7%8%31%
2107
11th to 20thNight
7%8%48%6%46%5%8%10%34%
1980
21st to endNight
8%12%48%6%5%7%7%7%9%29%
2178
April1st to 10thNight
9%9%5%8%7%47%6%6%8%31%
1753
11th to 20thNight
9%10%49%7%45%5%5%8%33%
1601
21st to endNight
10%8%45%6%35%6%6%9%37%
1620
May1st to 10thNight
13%7%36%5%35%6%5%8%37%
1486
11th to 20thNight
9%435%5%36%5%7%7%46%
1285
21st to endNight
18%6%35%6%46%5%7%8%34%
1358
June1st to 10thNight
15%7%25%436%6%9%10%34%
1260
11th to 20thNight
15%6%35%5%47%7%7%8%33%
1260
21st to endNight
7%4345%45%5%7%8%49%
1260
July1st to 10thNight
6%5%235%35%6%7%10%49%
1260
11th to 20thNight
8%4235%345%6%11%50%
1260
21st to endNight
322243445%10%61%
1379
August1st to 10thNight
5%425%5%35%47%10%50%
1462
11th to 20thNight
6%4145%435%7%9%51%
1602
21st to endNight
8%414335%5%6%9%52%
1782
September1st to 10thNight
10%5%245%45%45%8%48%
1717
11th to 20thNight
12%5%245%34447%51%
1958
21st to endNight
7%5%25%6%245%6%8%50%
1980
October1st to 10thNight
10%7%37%5%335%5%7%45%
2134
11th to 20thNight
8%6%36%7%345%6%8%43%
2182
21st to endNight
7%9%48%7%35%5%6%8%37%
2582
November1st to 10thNight
11%11%47%7%45%5%6%7%33%
2590
11th to 20thNight
5%9%38%8%46%6%7%10%36%
2660
21st to endNight
6%10%5%8%7%45%6%7%9%33%
2788
December1st to 10thNight
7%11%5%10%8%46%5%6%7%31%
2850
11th to 20thNight
49%5%9%8%5%5%6%6%10%33%
3510
21st to endNight
47%37%6%45%5%5%7%46%
5214

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
50%8%15%19%7%1
2219
11th to 20thDay
51%9%13%13%14%1
2220
21st to endDay
40%9%22%24%5%
2670
February1st to 10thDay
56%6%13%18%7%
1629
11th to 20thDay
53%8%14%17%8%
1674
21st to endDay
53%7%11%19%9%
1425
March1st to 10thDay
53%8%14%18%7%
1859
11th to 20thDay
47%7%15%23%7%1
1980
21st to endDay
49%7%19%18%7%
2178
April1st to 10thDay
47%7%15%21%8%
2205
11th to 20thDay
47%6%12%26%7%1
2310
21st to endDay
45%7%15%25%8%1
2340
May1st to 10thDay
45%6%14%24%10%1
2473
11th to 20thDay
36%7%15%27%15%1
2610
21st to endDay
48%6%13%22%9%1
2918
June1st to 10thDay
44%6%15%23%10%1
2700
11th to 20thDay
46%8%14%23%8%1
2700
21st to endDay
30%8%21%31%9%2
2700
July1st to 10thDay
27%8%20%31%12%2
2626
11th to 20thDay
26%7%20%29%16%2
2619
21st to endDay
19%5%16%36%20%3
2775
August1st to 10thDay
27%6%18%31%15%3
2455
11th to 20thDay
26%7%20%31%13%2
2299
21st to endDay
25%6%18%31%17%3
2574
September1st to 10thDay
32%414%27%16%6%
2242
11th to 20thDay
36%6%14%29%13%2
1998
21st to endDay
32%6%15%31%14%3
1980
October1st to 10thDay
40%6%15%27%11%1
1825
11th to 20thDay
39%6%16%27%11%1
1778
21st to endDay
41%7%16%24%10%1
1756
November1st to 10thDay
54%6%12%20%7%1
1488
11th to 20thDay
46%7%17%23%7%
1520
21st to endDay
45%7%18%22%7%1
1389
December1st to 10thDay
53%9%14%16%6%2
1330
11th to 20thDay
51%7%16%21%5%1
1684
21st to endDay
37%5%14%27%15%2
2442
January1st to 10thNight
50%9%17%19%41
4726
11th to 20thNight
49%6%13%18%13%2
4740
21st to endNight
43%8%16%26%7%1
5015
February1st to 10thNight
49%7%13%20%11%1
2550
11th to 20thNight
52%7%12%18%10%1
2403
21st to endNight
44%7%13%24%11%1
2027
March1st to 10thNight
46%8%16%23%6%
2107
11th to 20thNight
42%7%15%24%9%1
1980
21st to endNight
49%8%17%18%8%1
2178
April1st to 10thNight
47%7%13%21%11%1
1753
11th to 20thNight
48%6%12%21%11%1
1601
21st to endNight
42%6%13%26%11%2
1620
May1st to 10thNight
44%7%11%23%15%1
1486
11th to 20thNight
35%6%12%28%18%2
1285
21st to endNight
46%6%13%23%11%2
1358
June1st to 10thNight
42%6%18%22%11%1
1260
11th to 20thNight
44%9%15%21%11%1
1260
21st to endNight
31%7%17%31%13%1
1260
July1st to 10thNight
29%8%17%30%15%2
1225
11th to 20thNight
28%9%18%26%16%4
1218
21st to endNight
20%6%12%37%20%5%
1302
August1st to 10thNight
29%7%18%30%14%3
1455
11th to 20thNight
28%6%15%30%18%3
1602
21st to endNight
28%6%11%28%22%5%
1782
September1st to 10thNight
34%6%13%25%17%7%
1717
11th to 20thNight
34%5%12%30%15%4
1958
21st to endNight
30%6%14%30%17%2
1980
October1st to 10thNight
38%5%16%25%14%2
2134
11th to 20thNight
37%6%15%29%12%2
2182
21st to endNight
43%7%14%26%9%1
2582
November1st to 10thNight
48%7%14%21%9%1
2590
11th to 20thNight
43%8%18%21%10%1
2660
21st to endNight
45%7%20%20%7%1
2788
December1st to 10thNight
51%6%15%19%8%1
2850
11th to 20thNight
45%8%23%18%5%
3507
21st to endNight
36%6%13%24%17%3
5214

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
8%9%27%28%18%9%
180
11th to 20thDay
12%5%28%34%18%3
180
21st to endDay
5%9%29%36%17%5%
198
February1st to 10thDay
18%9%29%32%11%2
231
11th to 20thDay
13%6%23%38%18%3
270
21st to endDay
8%8%24%32%23%5%
237
March1st to 10thDay
11%9%33%29%14%5%
421
11th to 20thDay
10%6%31%33%14%5%
420
21st to endDay
10%9%31%28%17%5%
462
April1st to 10thDay
8%13%30%32%13%3
420
11th to 20thDay
11%11%31%31%14%2
412
21st to endDay
13%10%26%34%13%4
420
May1st to 10thDay
14%8%21%30%21%7%
556
11th to 20thDay
13%6%21%33%22%6%
625
21st to endDay
19%5%19%28%22%7%
679
June1st to 10thDay
13%8%21%34%21%3
630
11th to 20thDay
18%7%30%27%16%3
630
21st to endDay
10%422%33%23%8%
630
July1st to 10thDay
7%5%18%36%26%8%
621
11th to 20thDay
10%324%32%24%6%
618
21st to endDay
5%321%31%30%9%
684
August1st to 10thDay
7%5%19%35%25%9%
493
11th to 20thDay
8%316%32%30%10%
437
21st to endDay
7%7%21%30%24%12%
495
September1st to 10thDay
13%7%23%31%21%4
450
11th to 20thDay
15%7%23%29%21%5%
450
21st to endDay
13%11%31%25%16%4
450
October1st to 10thDay
18%5%23%28%20%7%
295
11th to 20thDay
10%8%33%26%21%2
270
21st to endDay
15%13%28%29%13%1
297
November1st to 10thDay
20%10%25%29%14%1
270
11th to 20thDay
11%13%36%27%11%2
270
21st to endDay
6%8%39%29%12%7%
207
December1st to 10thDay
11%434%29%18%3
180
11th to 20thDay
8%12%39%28%11%2
180
21st to endDay
10%9%23%34%20%6%
198
January1st to 10thNight
8%10%34%33%13%2
950
11th to 20thNight
12%9%29%35%13%2
950
21st to endNight
11%8%30%34%14%2
924
February1st to 10thNight
12%8%23%36%18%3
760
11th to 20thNight
13%7%29%39%12%1
744
21st to endNight
9%5%24%36%22%4
628
March1st to 10thNight
7%7%33%36%14%3
722
11th to 20thNight
10%8%31%34%15%3
720
21st to endNight
14%8%25%36%16%2
792
April1st to 10thNight
13%10%29%31%14%3
591
11th to 20thNight
13%8%31%36%11%1
533
21st to endNight
14%7%25%37%14%1
540
May1st to 10thNight
16%7%23%32%21%2
540
11th to 20thNight
10%6%29%36%19%1
400
21st to endNight
22%422%31%19%2
389
June1st to 10thNight
17%7%24%33%18%2
360
11th to 20thNight
17%6%28%32%16%1
360
21st to endNight
9%5%24%36%23%3
360
July1st to 10thNight
8%422%45%21%1
350
11th to 20thNight
9%426%42%19%1
348
21st to endNight
4422%43%24%4
394
August1st to 10thNight
8%322%40%24%2
437
11th to 20thNight
9%421%41%24%1
534
21st to endNight
11%322%38%24%2
594
September1st to 10thNight
13%422%44%15%2
540
11th to 20thNight
14%5%22%41%17%1
698
21st to endNight
11%6%30%34%16%2
720
October1st to 10thNight
13%5%28%39%14%2
720
11th to 20thNight
9%8%31%35%15%2
720
21st to endNight
12%10%31%35%11%1
800
November1st to 10thNight
17%8%33%31%9%1
925
11th to 20thNight
10%11%38%29%11%2
950
21st to endNight
10%8%33%35%12%1
950
December1st to 10thNight
12%7%29%34%14%3
950
11th to 20thNight
9%8%35%34%13%2
950
21st to endNight
11%6%33%35%14%2
1045
Page generated at 2024-02-27 04:30:16. Version ac07

Copyright © 2024 Attilla Danko.


Dinosaur Provincial Park Clear Sky Chart |Charts Home