Camrose
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camrose clear sky chart from 2005-11-05 to 2017-08-12.

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
41%
15095
10%
46419
7%
15069
44%
15069
18%
33118

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
35%
895
7%
2685
4%
895
37%
895
13%
2062
January16th to endNight
31%
906
15%
2826
7%
906
39%
906
17%
2011
February1st to 15thNight
40%
697
8%
2409
7%
696
44%
696
16%
1713
February16th to endNight
44%
632
13%
2031
12%
632
47%
632
19%
1426
March1st to 15thNight
40%
720
12%
2098
8%
720
44%
720
18%
1546
March16th to endNight
39%
768
9%
2109
5%
767
41%
767
17%
1640
April1st to 15thNight
38%
587
12%
1667
7%
587
41%
587
17%
1233
April16th to endNight
41%
540
10%
1620
8%
540
44%
540
18%
1175
May1st to 15thNight
43%
407
9%
1325
8%
407
45%
407
18%
921
May16th to endNight
40%
374
1%
1309
0%
374
40%
374
15%
940
June1st to 15thNight
39%
360
0%
1260
0%
360
39%
360
14%
939
June16th to endNight
51%
360
0%
1260
0%
360
51%
360
17%
867
July1st to 15thNight
57%
340
0%
1190
0%
340
57%
340
22%
766
July16th to endNight
60%
376
4%
1239
3%
354
61%
354
24%
764
August1st to 15thNight
63%
382
6%
1377
8%
380
64%
380
22%
853
August16th to endNight
59%
525
11%
1575
11%
525
60%
525
28%
1015
September1st to 15thNight
58%
560
15%
1627
11%
560
59%
560
30%
1025
September16th to endNight
51%
656
18%
1815
12%
656
56%
656
34%
1124
October1st to 15thNight
43%
660
16%
1963
10%
660
48%
660
22%
1337
October16th to endNight
41%
715
14%
2299
10%
715
47%
715
18%
1591
November1st to 15thNight
34%
875
14%
2455
10%
875
39%
875
18%
1817
November16th to endNight
29%
900
10%
2700
5%
900
33%
900
14%
2061
December1st to 15thNight
29%
900
8%
2700
5%
900
32%
900
12%
2139
December16th to endNight
37%
960
12%
2880
6%
960
42%
960
15%
2153

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%9%47%6%35%5%6%8%31%
47586
Night
9%9%48%7%45%5%6%8%30%
46578
TransparencyDay
48%8%17%18%5%
47236
Night
49%8%15%19%6%
46432
SeeingDay
15%6%23%30%18%5%
5961
Night
13%5%26%35%17%2
15109

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
6%12%6%9%9%5%6%5%6%6%25%
1253
16th to endDay
5%11%5%10%9%45%5%6%8%27%
1407
February1st to 15thDay
8%10%6%8%8%45%45%9%27%
1444
16th to endDay
6%13%6%10%8%37%6%6%6%24%
1443
March1st to 15thDay
7%13%5%9%7%46%5%7%7%24%
1862
16th to endDay
12%12%6%10%6%345%6%7%24%
2111
April1st to 15thDay
13%11%5%7%6%3445%7%29%
2279
16th to endDay
14%11%37%6%25%5%6%8%29%
2340
May1st to 15thDay
9%8%37%6%35%5%6%7%34%
2623
16th to endDay
18%8%36%6%35%5%5%6%30%
2802
June1st to 15thDay
17%7%38%6%36%5%6%7%26%
2700
16th to endDay
14%6%26%7%36%6%6%8%30%
2700
July1st to 15thDay
10%5%25%5%36%6%6%10%37%
2700
16th to endDay
9%5%25%435%6%6%9%40%
2846
August1st to 15thDay
11%6%25%6%35%5%7%9%36%
2489
16th to endDay
8%6%26%5%345%5%10%39%
2275
September1st to 15thDay
12%6%25%5%4445%6%41%
2002
16th to endDay
11%42443345%9%46%
1815
October1st to 15thDay
12%9%47%5%25%5%5%6%34%
1667
16th to endDay
10%9%36%5%36%6%6%9%32%
1562
November1st to 15thDay
7%13%6%8%6%345%5%7%30%
1402
16th to endDay
7%10%5%12%7%36%446%31%
1260
December1st to 15thDay
6%13%6%14%11%6%5%45%7%18%
1260
16th to endDay
7%12%49%9%5%6%5%5%7%24%
1344
January1st to 15thNight
7%11%5%9%9%5%6%6%6%7%23%
2685
16th to endNight
6%10%5%9%7%35%46%7%31%
2826
February1st to 15thNight
5%8%5%10%8%5%6%6%48%30%
2407
16th to endNight
7%12%5%7%5%35%6%6%8%30%
2031
March1st to 15thNight
6%9%49%7%5%6%6%7%8%27%
2098
16th to endNight
10%13%6%8%7%35%6%6%9%21%
2109
April1st to 15thNight
10%9%48%7%46%46%8%28%
1667
16th to endNight
14%10%46%5%4445%7%30%
1620
May1st to 15thNight
11%8%5%8%6%35%5%7%7%30%
1325
16th to endNight
18%8%37%6%26%5%5%6%29%
1309
June1st to 15thNight
14%8%310%6%35%7%5%7%24%
1260
16th to endNight
11%6%36%6%46%8%7%9%29%
1260
July1st to 15thNight
11%425%5%35%5%6%12%37%
1260
16th to endNight
8%435%5%36%5%7%9%40%
1323
August1st to 15thNight
9%4245%36%5%7%12%38%
1384
16th to endNight
7%5%25%6%45%5%6%10%40%
1575
September1st to 15thNight
13%4245%23447%46%
1627
16th to endNight
10%5%2432345%8%49%
1815
October1st to 15thNight
10%9%5%7%43445%8%35%
1963
16th to endNight
9%9%46%6%36%5%6%8%32%
2299
November1st to 15thNight
9%12%5%7%7%46%45%6%30%
2455
16th to endNight
7%11%6%11%9%35%45%7%26%
2700
December1st to 15thNight
9%13%6%11%8%445%5%8%21%
2700
16th to endNight
410%6%9%9%5%7%6%6%8%24%
2880

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
56%9%14%14%4
1253
16th to endDay
53%6%14%15%7%1
1407
February1st to 15thDay
52%7%17%15%5%
1444
16th to endDay
56%8%11%17%6%
1443
March1st to 15thDay
55%8%15%16%3
1862
16th to endDay
57%8%14%15%3
2112
April1st to 15thDay
53%6%16%15%6%
2279
16th to endDay
52%7%16%15%7%1
2340
May1st to 15thDay
46%7%13%21%9%
2623
16th to endDay
51%8%14%16%8%
2807
June1st to 15thDay
53%10%13%17%4
2700
16th to endDay
48%10%19%17%3
2700
July1st to 15thDay
38%9%24%22%3
2541
16th to endDay
37%11%24%23%2
2667
August1st to 15thDay
41%11%27%17%2
2471
16th to endDay
38%9%24%22%5%1
2275
September1st to 15thDay
41%8%19%22%7%
2002
16th to endDay
34%7%19%30%6%1
1815
October1st to 15thDay
48%7%17%19%6%
1667
16th to endDay
46%9%14%24%5%
1562
November1st to 15thDay
51%7%17%18%5%
1402
16th to endDay
54%7%16%15%5%
1260
December1st to 15thDay
67%6%11%12%2
1260
16th to endDay
56%6%14%16%5%
1344
January1st to 15thNight
56%8%16%12%41
2685
16th to endNight
50%6%15%18%7%1
2826
February1st to 15thNight
51%6%16%17%7%
2418
16th to endNight
49%7%13%18%9%1
2031
March1st to 15thNight
50%9%14%19%6%
2098
16th to endNight
56%7%13%16%5%
2112
April1st to 15thNight
50%9%13%17%7%1
1667
16th to endNight
51%7%11%18%9%2
1620
May1st to 15thNight
49%6%10%21%11%
1326
16th to endNight
53%7%10%19%7%2
1309
June1st to 15thNight
54%8%14%16%5%
1260
16th to endNight
45%10%20%18%3
1260
July1st to 15thNight
38%11%21%23%5%
1190
16th to endNight
35%11%23%25%4
1239
August1st to 15thNight
35%11%28%20%3
1377
16th to endNight
35%9%20%27%6%
1575
September1st to 15thNight
36%7%17%25%11%1
1627
16th to endNight
32%7%18%27%11%3
1815
October1st to 15thNight
45%6%16%23%8%
1963
16th to endNight
47%8%16%23%4
2299
November1st to 15thNight
51%8%13%20%5%1
2455
16th to endNight
56%7%14%13%6%1
2700
December1st to 15thNight
60%8%13%13%3
2700
16th to endNight
53%8%15%16%4
2880

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
8%128%46%8%6%
60
16th to endDay
3315%45%23%9%
64
February1st to 15thDay
13%231%30%17%4
69
16th to endDay
11%5%24%33%20%3
102
March1st to 15thDay
14%5%32%34%11%1
270
16th to endDay
18%5%29%28%16%1
288
April1st to 15thDay
14%15%25%30%11%1
269
16th to endDay
23%10%22%26%14%2
270
May1st to 15thDay
11%7%22%35%15%7%
450
16th to endDay
18%5%22%27%18%7%
517
June1st to 15thDay
18%7%25%28%13%6%
495
16th to endDay
14%423%30%19%7%
495
July1st to 15thDay
10%217%32%29%6%
475
16th to endDay
10%422%32%23%6%
515
August1st to 15thDay
14%215%28%25%13%
352
16th to endDay
11%7%21%33%22%3
268
September1st to 15thDay
18%326%31%13%6%
255
16th to endDay
10%13%26%28%16%3
255
October1st to 15thDay
26%6%18%30%13%3
123
16th to endDay
19%6%19%30%19%4
96
November1st to 15thDay
17%331%31%14%1
89
16th to endDay
13%8%30%23%10%15%
60
December1st to 15thDay
8%135%25%23%6%
60
16th to endDay
15%321%31%23%4
64
January1st to 15thNight
11%8%30%34%13%2
900
16th to endNight
12%9%32%34%10%1
906
February1st to 15thNight
8%7%23%37%20%1
704
16th to endNight
11%5%22%35%19%4
632
March1st to 15thNight
10%429%36%15%2
720
16th to endNight
13%5%26%35%15%2
768
April1st to 15thNight
13%6%28%32%17%1
587
16th to endNight
18%6%23%35%13%2
540
May1st to 15thNight
13%7%21%36%18%2
408
16th to endNight
20%5%21%30%21%2
375
June1st to 15thNight
19%422%34%15%4
360
16th to endNight
14%123%35%23%2
360
July1st to 15thNight
15%17%40%24%1
340
16th to endNight
7%318%44%22%1
376
August1st to 15thNight
10%214%32%34%4
382
16th to endNight
9%319%38%28%
525
September1st to 15thNight
15%215%39%24%2
560
16th to endNight
13%325%38%15%2
656
October1st to 15thNight
16%327%33%17%1
660
16th to endNight
15%428%39%12%
715
November1st to 15thNight
14%6%32%33%10%2
875
16th to endNight
13%7%33%31%12%2
900
December1st to 15thNight
16%7%29%29%14%3
900
16th to endNight
9%331%34%17%3
960
Page generated at 2017-08-13 12:16:36. Version ac04

Copyright 2017 A. Danko


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