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 2005-11-05 to 2018-01-12.

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
43%
15865
13%
48362
9%
15839
48%
15839
23%
32265

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
37%
951
9%
2852
6%
951
39%
951
17%
2094
January16th to endNight
35%
884
16%
2804
9%
884
44%
884
18%
1966
February1st to 15thNight
45%
697
12%
2339
11%
696
50%
696
18%
1598
February16th to endNight
46%
632
12%
2043
12%
632
48%
632
19%
1453
March1st to 15thNight
37%
720
13%
2061
8%
720
42%
720
22%
1440
March16th to endNight
39%
768
10%
2112
4%
768
43%
768
19%
1554
April1st to 15thNight
35%
572
12%
1706
6%
572
40%
572
18%
1226
April16th to endNight
43%
540
16%
1620
13%
540
46%
540
22%
1087
May1st to 15thNight
48%
509
14%
1439
10%
509
51%
509
29%
920
May16th to endNight
42%
375
8%
1309
6%
374
45%
374
18%
881
June1st to 15thNight
45%
360
2%
1260
0%
360
45%
360
20%
834
June16th to endNight
55%
360
1%
1260
0%
360
55%
360
26%
744
July1st to 15thNight
58%
340
2%
1190
1%
340
58%
340
29%
668
July16th to endNight
63%
376
14%
1239
14%
354
68%
354
38%
618
August1st to 15thNight
64%
473
14%
1515
14%
471
67%
471
34%
849
August16th to endNight
60%
573
23%
1719
18%
573
65%
573
40%
949
September1st to 15thNight
57%
585
19%
1791
15%
585
60%
585
33%
1067
September16th to endNight
52%
716
22%
1980
15%
716
58%
716
38%
1177
October1st to 15thNight
45%
720
19%
2143
10%
720
53%
720
28%
1378
October16th to endNight
43%
774
19%
2457
11%
774
52%
774
25%
1550
November1st to 15thNight
35%
950
17%
2660
8%
950
43%
950
22%
1815
November16th to endNight
34%
975
13%
2818
7%
975
39%
975
21%
1961
December1st to 15thNight
35%
975
10%
2925
6%
975
38%
975
16%
2171
December16th to endNight
33%
1040
14%
3120
7%
1040
40%
1040
17%
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
10%7%36%5%35%5%6%8%37%
49019
Night
8%8%36%6%35%5%6%8%36%
48509
Cloud CoverDay
10%7%36%5%35%5%6%8%37%
49020
Night
8%8%36%6%35%5%6%8%36%
48512
TransparencyDay
42%6%17%23%8%1
48669
Night
43%6%15%22%9%1
48363
SeeingDay
13%6%24%29%20%5%
6384
Night
12%6%27%35%16%2
15878

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 15thDay
9%11%5%8%8%46%5%5%7%24%
1330
16th to endDay
6%11%47%6%48%6%8%8%26%
1431
February1st to 15thDay
10%12%410%7%45%5%5%8%24%
1524
16th to endDay
6%15%6%11%6%45%5%46%25%
1429
March1st to 15thDay
6%10%5%9%7%46%5%6%7%29%
1899
16th to endDay
10%12%5%7%7%45%5%5%8%26%
2111
April1st to 15thDay
11%8%47%6%36%5%5%8%31%
2241
16th to endDay
13%8%36%5%35%5%5%8%33%
2340
May1st to 15thDay
10%8%35%5%25%47%7%39%
2510
16th to endDay
19%8%35%5%345%6%8%30%
2802
June1st to 15thDay
16%6%26%5%46%5%6%7%32%
2700
16th to endDay
11%425%5%346%6%10%40%
2700
July1st to 15thDay
6%324425%5%7%9%47%
2700
16th to endDay
6%21232446%9%56%
2846
August1st to 15thDay
7%31442446%9%50%
2436
16th to endDay
7%31322446%7%57%
2483
September1st to 15thDay
13%5%14423336%50%
2166
16th to endDay
9%5%1442335%8%50%
1980
October1st to 15thDay
11%7%37%5%35%5%46%39%
1816
16th to endDay
9%6%35%5%35%5%7%9%38%
1755
November1st to 15thDay
8%11%5%9%6%46%5%5%7%30%
1528
16th to endDay
7%11%47%6%45%45%8%32%
1471
December1st to 15thDay
8%13%6%8%8%47%6%5%6%23%
1365
16th to endDay
5%13%5%10%7%5%5%6%6%8%23%
1456
January1st to 15thNight
7%10%5%8%8%47%6%7%8%26%
2852
16th to endNight
6%10%49%6%37%5%6%7%31%
2804
February1st to 15thNight
8%9%47%6%5%6%5%6%8%32%
2328
16th to endNight
6%10%48%8%46%6%6%8%28%
2043
March1st to 15thNight
6%8%48%7%36%6%7%9%30%
2061
16th to endNight
9%10%48%6%46%5%7%8%28%
2109
April1st to 15thNight
11%9%38%7%46%6%5%7%28%
1706
16th to endNight
11%10%45%5%3445%8%37%
1620
May1st to 15thNight
12%5%34435%46%7%42%
1439
16th to endNight
19%5%25%5%46%47%7%32%
1309
June1st to 15thNight
15%6%25%5%36%6%8%7%33%
1260
16th to endNight
8%4245%45%6%6%7%43%
1260
July1st to 15thNight
8%2235%345%6%10%47%
1260
16th to endNight
421243445%10%55%
1323
August1st to 15thNight
6%31443447%9%49%
1522
16th to endNight
7%233345%6%10%52%
1719
September1st to 15thNight
11%5%235%34335%52%
1791
16th to endNight
8%324414448%51%
1980
October1st to 15thNight
9%7%37%5%235%5%8%40%
2143
16th to endNight
8%8%35%6%345%6%8%40%
2457
November1st to 15thNight
7%8%36%7%35%5%5%7%38%
2660
16th to endNight
7%11%38%6%345%6%8%33%
2818
December1st to 15thNight
6%11%5%10%8%46%5%5%7%27%
2925
16th to endNight
5%12%5%10%8%36%5%5%7%28%
3120

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 15thDay
8%11%5%8%9%5%6%5%6%7%24%
1330
16th to endDay
6%10%5%8%7%46%7%8%7%26%
1431
February1st to 15thDay
9%12%5%8%8%35%6%5%8%25%
1524
16th to endDay
6%15%7%10%6%35%5%5%7%25%
1429
March1st to 15thDay
6%9%5%10%7%5%5%6%6%8%29%
1899
16th to endDay
10%11%5%9%6%36%5%6%7%25%
2112
April1st to 15thDay
10%8%47%6%36%6%6%8%31%
2241
16th to endDay
13%8%35%5%35%5%5%8%34%
2340
May1st to 15thDay
10%8%35%5%3445%7%40%
2510
16th to endDay
19%7%36%5%3446%8%30%
2802
June1st to 15thDay
16%6%26%5%36%5%6%8%32%
2700
16th to endDay
11%425%5%35%5%6%10%40%
2700
July1st to 15thDay
6%314425%5%7%9%48%
2700
16th to endDay
6%21232445%9%56%
2846
August1st to 15thDay
7%31442346%9%50%
2436
16th to endDay
7%21332345%9%56%
2483
September1st to 15thDay
13%5%23423345%50%
2166
16th to endDay
9%42432335%9%50%
1980
October1st to 15thDay
11%8%37%5%35%35%6%40%
1816
16th to endDay
9%7%245%35%6%7%8%38%
1755
November1st to 15thDay
8%10%5%10%5%35%5%5%7%30%
1528
16th to endDay
7%11%5%7%7%45%46%8%32%
1471
December1st to 15thDay
9%12%5%11%7%46%6%6%5%24%
1365
16th to endDay
413%6%11%8%47%5%5%9%23%
1456
January1st to 15thNight
7%10%5%9%7%5%7%5%6%8%26%
2852
16th to endNight
6%10%49%7%36%5%6%8%31%
2804
February1st to 15thNight
8%10%47%6%45%6%5%7%33%
2328
16th to endNight
6%10%5%8%8%46%6%5%8%29%
2043
March1st to 15thNight
6%8%46%8%46%6%7%9%30%
2061
16th to endNight
9%9%48%6%45%6%6%9%28%
2112
April1st to 15thNight
11%10%37%7%46%5%6%7%29%
1706
16th to endNight
11%10%35%5%24447%37%
1620
May1st to 15thNight
13%4245%26%5%5%6%43%
1439
16th to endNight
18%5%34445%47%7%32%
1309
June1st to 15thNight
16%5%25%5%35%6%7%8%33%
1260
16th to endNight
8%4246%45%6%5%9%42%
1260
July1st to 15thNight
8%3134445%6%9%48%
1260
16th to endNight
421242445%9%56%
1323
August1st to 15thNight
7%3144435%6%9%48%
1522
16th to endNight
8%21232446%9%53%
1719
September1st to 15thNight
11%5%24423345%51%
1791
16th to endNight
8%42442445%7%51%
1980
October1st to 15thNight
9%7%36%5%3445%8%40%
2143
16th to endNight
8%7%26%5%35%5%6%8%40%
2457
November1st to 15thNight
7%8%36%6%45%45%7%38%
2660
16th to endNight
7%11%47%6%35%5%6%8%33%
2818
December1st to 15thNight
6%11%5%10%8%45%5%5%7%27%
2925
16th to endNight
5%11%5%10%8%46%5%6%8%28%
3120

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
55%7%14%16%4
1330
16th to endDay
50%8%18%16%6%1
1431
February1st to 15thDay
55%5%15%17%5%
1524
16th to endDay
57%6%14%15%6%
1429
March1st to 15thDay
50%8%18%17%5%
1899
16th to endDay
54%7%15%18%4
2112
April1st to 15thDay
48%7%15%20%6%
2241
16th to endDay
46%6%15%23%6%1
2340
May1st to 15thDay
40%5%14%25%12%
2510
16th to endDay
50%6%15%19%7%
2807
June1st to 15thDay
49%6%15%21%7%
2700
16th to endDay
36%7%20%27%6%
2700
July1st to 15thDay
28%7%20%31%10%1
2541
16th to endDay
24%5%20%31%16%2
2667
August1st to 15thDay
30%6%21%30%9%1
2418
16th to endDay
23%6%20%32%15%1
2483
September1st to 15thDay
34%413%26%15%6%
2166
16th to endDay
31%5%14%31%14%2
1980
October1st to 15thDay
43%5%15%25%8%
1816
16th to endDay
39%7%18%24%8%
1755
November1st to 15thDay
50%7%16%20%5%
1528
16th to endDay
47%6%18%19%6%
1471
December1st to 15thDay
58%7%14%15%2
1365
16th to endDay
55%6%16%17%5%
1456
January1st to 15thNight
51%7%18%16%4
2852
16th to endNight
48%7%14%20%7%2
2804
February1st to 15thNight
48%6%15%20%8%
2339
16th to endNight
49%7%13%19%8%
2043
March1st to 15thNight
45%8%20%21%4
2061
16th to endNight
49%8%15%20%5%
2112
April1st to 15thNight
51%5%13%19%8%
1706
16th to endNight
46%412%23%11%2
1620
May1st to 15thNight
39%5%11%27%14%1
1440
16th to endNight
48%6%12%21%10%1
1309
June1st to 15thNight
45%6%18%19%9%
1260
16th to endNight
35%7%16%28%10%
1260
July1st to 15thNight
30%8%17%26%14%2
1190
16th to endNight
24%6%16%34%15%2
1239
August1st to 15thNight
28%7%20%29%12%1
1515
16th to endNight
26%5%12%29%21%4
1719
September1st to 15thNight
34%49%26%18%6%
1791
16th to endNight
30%5%15%28%17%2
1980
October1st to 15thNight
39%5%17%23%11%1
2143
16th to endNight
39%6%17%27%8%
2457
November1st to 15thNight
43%7%16%22%8%
2660
16th to endNight
47%5%20%16%8%
2818
December1st to 15thNight
54%7%16%17%4
2925
16th to endNight
51%7%15%18%6%
3120

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
14%214%24%29%14%
82
16th to endDay
9%7%23%26%20%12%
64
February1st to 15thDay
17%6%22%37%16%1
81
16th to endDay
19%5%20%28%25%1
88
March1st to 15thDay
13%8%39%31%5%1
270
16th to endDay
12%7%35%29%13%1
288
April1st to 15thDay
11%15%27%29%13%2
269
16th to endDay
19%8%21%31%14%4
270
May1st to 15thDay
12%7%24%30%19%6%
438
16th to endDay
22%418%27%20%6%
517
June1st to 15thDay
15%6%24%31%18%3
495
16th to endDay
11%427%31%19%5%
495
July1st to 15thDay
8%318%35%27%7%
475
16th to endDay
9%325%29%26%6%
515
August1st to 15thDay
6%418%30%28%11%
345
16th to endDay
8%5%18%29%28%10%
332
September1st to 15thDay
19%6%19%25%22%6%
315
16th to endDay
11%9%24%25%23%6%
315
October1st to 15thDay
21%228%25%19%2
151
16th to endDay
14%9%22%30%20%1
144
November1st to 15thDay
13%11%32%22%18%2
135
16th to endDay
10%8%35%28%8%7%
114
December1st to 15thDay
11%5%42%21%14%5%
90
16th to endDay
12%6%30%26%20%4
96
January1st to 15thNight
12%9%29%32%14%2
956
16th to endNight
11%7%29%34%13%2
884
February1st to 15thNight
14%7%19%37%17%3
704
16th to endNight
11%5%24%36%18%3
632
March1st to 15thNight
9%7%35%33%12%2
720
16th to endNight
13%7%26%37%13%1
768
April1st to 15thNight
16%10%27%30%11%2
572
16th to endNight
16%6%22%36%15%1
540
May1st to 15thNight
13%5%26%33%18%2
510
16th to endNight
22%424%23%24%1
375
June1st to 15thNight
18%5%23%29%19%2
360
16th to endNight
10%423%38%22%1
360
July1st to 15thNight
10%221%41%22%1
340
16th to endNight
6%322%42%23%2
376
August1st to 15thNight
9%317%39%28%2
473
16th to endNight
11%221%35%26%2
573
September1st to 15thNight
14%317%42%18%2
585
16th to endNight
11%326%36%18%2
716
October1st to 15thNight
13%427%36%15%2
720
16th to endNight
12%6%29%37%11%1
774
November1st to 15thNight
12%8%35%30%11%2
950
16th to endNight
12%8%33%33%11%1
975
December1st to 15thNight
11%5%30%33%16%2
975
16th to endNight
10%5%32%34%13%3
1040
Page generated at 2018-01-12 20:01:27. Version ac04

Copyright 2018 A. Danko


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