Camrose
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camrose clear sky chart from 2005-11-06 to 2024-02-25.

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%
23640
11%
80810
8%
23586
45%
23586
18%
54782

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
35%
936
11%
4677
5%
926
39%
926
10%
3262
January11th to 20thNight
33%
938
18%
4610
7%
930
40%
930
12%
3016
January21st to endNight
28%
945
10%
5022
7%
938
35%
938
10%
3146
February1st to 10thNight
38%
760
12%
2660
9%
760
44%
760
15%
1897
February11th to 20thNight
38%
741
12%
2419
10%
740
43%
740
18%
1703
February21st to endNight
46%
610
16%
1951
14%
610
51%
610
20%
1324
March1st to 10thNight
40%
720
13%
2157
11%
720
43%
720
17%
1593
March11th to 20thNight
39%
720
15%
1980
8%
720
44%
720
21%
1433
March21st to endNight
41%
792
10%
2178
5%
792
44%
792
20%
1621
April1st to 10thNight
42%
613
14%
1693
7%
613
46%
613
22%
1192
April11th to 20thNight
37%
533
13%
1601
8%
533
41%
533
17%
1173
April21st to endNight
44%
540
11%
1620
10%
540
48%
540
21%
1131
May1st to 10thNight
41%
432
9%
1360
8%
432
44%
432
17%
984
May11th to 20thNight
49%
354
8%
1239
7%
354
50%
354
20%
804
May21st to endNight
40%
388
1%
1358
0%
388
40%
388
16%
949
June1st to 10thNight
40%
360
0%
1260
0%
360
40%
360
16%
897
June11th to 20thNight
38%
360
0%
1260
0%
360
38%
360
12%
952
June21st to endNight
59%
360
0%
1260
0%
360
59%
360
21%
801
July1st to 10thNight
55%
350
0%
1225
0%
350
55%
350
23%
775
July11th to 20thNight
56%
348
0%
1218
0%
348
56%
348
21%
796
July21st to endNight
63%
394
6%
1302
6%
372
64%
372
29%
744
August1st to 10thNight
58%
358
7%
1343
8%
356
59%
356
20%
843
August11th to 20thNight
59%
495
10%
1563
11%
495
60%
495
27%
989
August21st to endNight
57%
594
16%
1782
14%
594
60%
594
28%
1139
September1st to 10thNight
54%
556
15%
1671
11%
556
56%
556
29%
1051
September11th to 20thNight
52%
720
18%
1980
12%
720
56%
720
32%
1254
September21st to endNight
48%
720
19%
1980
13%
720
53%
720
30%
1282
October1st to 10thNight
45%
720
17%
2106
11%
720
49%
720
25%
1388
October11th to 20thNight
40%
720
18%
2276
11%
720
48%
720
23%
1474
October21st to endNight
36%
809
15%
2591
8%
809
44%
809
18%
1806
November1st to 10thNight
33%
925
14%
2590
8%
925
38%
925
17%
1943
November11th to 20thNight
31%
950
13%
2763
7%
950
38%
950
17%
2067
November21st to endNight
30%
950
10%
2850
4%
950
35%
950
18%
2070
December1st to 10thNight
32%
950
13%
2850
7%
950
37%
950
15%
2120
December11th to 20thNight
32%
949
11%
3477
6%
949
37%
949
13%
2546
December21st to endNight
36%
1030
8%
4938
5%
1026
42%
1026
13%
2617

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%9%47%7%45%5%6%8%35%
77788
Night
8%9%48%7%46%6%6%8%33%
81472
TransparencyDay
45%9%17%21%7%1
77490
Night
46%8%15%21%9%1
81350
SeeingDay
13%7%24%31%19%6%
14415
Night
12%6%28%36%16%2
23701

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
5%11%5%10%10%5%6%5%6%8%29%
2219
11th to 20thDay
49%48%7%5%7%7%10%8%30%
2199
21st to endDay
6%11%5%9%8%45%5%5%7%36%
2607
February1st to 10thDay
8%13%7%8%10%4446%9%26%
1520
11th to 20thDay
6%11%6%10%8%47%7%7%6%28%
1648
21st to endDay
411%5%10%8%37%7%7%8%28%
1399
March1st to 10thDay
6%14%5%10%9%6%8%5%7%6%24%
1803
11th to 20thDay
8%11%6%7%7%345%6%8%34%
1979
21st to endDay
10%11%6%12%8%45%6%6%8%24%
2178
April1st to 10thDay
8%12%5%9%8%46%5%6%7%31%
2264
11th to 20thDay
13%12%48%7%35%5%6%8%31%
2310
21st to endDay
13%9%37%6%36%6%7%9%31%
2340
May1st to 10thDay
12%10%49%7%46%6%7%7%30%
2596
11th to 20thDay
8%6%36%6%46%6%6%8%40%
2654
21st to endDay
18%7%37%6%45%5%5%7%33%
2917
June1st to 10thDay
16%6%38%6%46%6%7%8%31%
2700
11th to 20thDay
20%8%37%7%46%7%5%9%24%
2700
21st to endDay
10%5%35%6%36%7%7%10%38%
2700
July1st to 10thDay
10%6%26%6%45%6%6%9%40%
2700
11th to 20thDay
11%5%26%5%46%6%7%11%37%
2700
21st to endDay
9%5%25%5%45%5%6%9%46%
2938
August1st to 10thDay
10%6%25%6%35%5%8%9%40%
2586
11th to 20thDay
9%5%25%6%45%5%6%9%44%
2338
21st to endDay
9%6%36%435%6%6%10%43%
2574
September1st to 10thDay
11%6%25%6%45%5%6%8%43%
2287
11th to 20thDay
15%7%245%3346%7%43%
1980
21st to endDay
9%6%25%5%345%7%9%45%
1980
October1st to 10thDay
10%11%48%5%35%46%6%38%
1854
11th to 20thDay
11%7%46%5%36%6%6%8%39%
1684
21st to endDay
8%10%5%7%6%5%7%7%6%8%30%
1746
November1st to 10thDay
9%15%6%9%8%45%6%5%7%26%
1488
11th to 20thDay
5%11%6%11%8%46%5%5%7%32%
1416
21st to endDay
6%9%5%12%7%46%5%5%8%32%
1330
December1st to 10thDay
6%12%5%10%9%7%7%5%6%8%25%
1330
11th to 20thDay
6%9%5%11%10%47%7%7%8%26%
1682
21st to endDay
5%8%37%7%45%45%7%45%
2442
January1st to 10thNight
410%6%11%10%5%7%7%7%7%25%
4726
11th to 20thNight
37%49%12%6%6%7%6%7%33%
4699
21st to endNight
6%12%5%10%7%35%5%6%8%33%
5077
February1st to 10thNight
5%10%5%12%9%6%6%6%5%8%28%
2660
11th to 20thNight
6%11%5%8%7%5%6%7%6%8%31%
2418
21st to endNight
5%10%48%8%5%6%7%7%8%33%
1951
March1st to 10thNight
6%10%5%11%9%5%6%5%6%8%28%
2157
11th to 20thNight
6%10%5%10%9%46%6%7%8%29%
1980
21st to endNight
10%12%6%8%7%45%6%7%10%26%
2178
April1st to 10thNight
6%9%48%7%47%5%6%9%35%
1693
11th to 20thNight
11%11%5%8%7%5%6%5%6%7%28%
1601
21st to endNight
13%9%36%7%45%6%5%8%34%
1620
May1st to 10thNight
14%9%48%6%46%5%9%7%28%
1360
11th to 20thNight
10%8%48%6%36%5%5%10%35%
1239
21st to endNight
19%7%38%6%26%5%6%7%31%
1358
June1st to 10thNight
15%9%38%7%35%7%6%8%29%
1260
11th to 20thNight
16%9%49%7%47%7%7%7%22%
1260
21st to endNight
8%435%6%5%7%8%8%10%36%
1260
July1st to 10thNight
12%5%36%5%45%5%7%10%38%
1260
11th to 20thNight
9%6%26%6%36%7%8%10%37%
1260
21st to endNight
9%335%5%35%47%10%47%
1379
August1st to 10thNight
9%5%35%6%46%5%7%11%40%
1350
11th to 20thNight
10%6%35%5%345%7%11%41%
1563
21st to endNight
8%5%36%6%45%6%6%9%43%
1782
September1st to 10thNight
12%5%25%7%346%6%8%44%
1671
11th to 20thNight
14%6%2443445%7%47%
1980
21st to endNight
9%7%25%5%345%6%8%45%
1980
October1st to 10thNight
11%8%47%5%35%5%6%8%39%
2106
11th to 20thNight
8%9%47%6%35%46%8%40%
2276
21st to endNight
6%10%48%7%46%6%7%8%33%
2591
November1st to 10thNight
11%14%5%8%7%46%46%6%29%
2590
11th to 20thNight
7%12%6%9%8%46%6%6%7%29%
2763
21st to endNight
5%9%6%12%9%46%5%6%8%30%
2850
December1st to 10thNight
8%11%5%11%9%5%5%5%5%8%28%
2850
11th to 20thNight
5%11%6%11%8%5%6%6%7%9%26%
3510
21st to endNight
37%47%6%45%5%6%9%43%
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
53%8%12%19%7%1
2219
11th to 20thDay
47%6%13%15%18%1
2220
21st to endDay
47%8%17%23%5%
2607
February1st to 10thDay
54%6%15%16%8%1
1520
11th to 20thDay
53%9%13%16%8%
1657
21st to endDay
50%8%13%21%8%
1399
March1st to 10thDay
58%8%14%16%4
1803
11th to 20thDay
47%8%13%22%10%
1980
21st to endDay
56%9%14%16%4
2178
April1st to 10thDay
49%9%16%17%8%1
2264
11th to 20thDay
50%7%15%19%8%1
2310
21st to endDay
46%9%15%21%7%2
2340
May1st to 10thDay
50%9%14%20%7%
2596
11th to 20thDay
40%8%13%27%11%
2658
21st to endDay
48%8%13%20%11%
2918
June1st to 10thDay
47%10%14%21%8%
2700
11th to 20thDay
55%10%14%15%41
2700
21st to endDay
38%12%23%20%5%1
2700
July1st to 10thDay
38%9%23%24%5%1
2626
11th to 20thDay
38%12%24%24%2
2619
21st to endDay
33%11%25%27%4
2775
August1st to 10thDay
37%12%24%23%4
2568
11th to 20thDay
34%11%25%23%7%
2338
21st to endDay
35%9%22%26%7%1
2574
September1st to 10thDay
38%9%20%24%8%2
2287
11th to 20thDay
40%6%18%28%8%
1980
21st to endDay
35%9%19%27%8%2
1980
October1st to 10thDay
46%7%16%21%9%
1854
11th to 20thDay
40%8%19%23%10%
1684
21st to endDay
48%10%12%23%8%
1746
November1st to 10thDay
55%8%15%15%6%1
1488
11th to 20thDay
51%8%16%20%5%
1416
21st to endDay
50%8%16%20%6%1
1330
December1st to 10thDay
58%8%12%14%7%2
1330
11th to 20thDay
51%10%16%17%6%
1684
21st to endDay
38%5%11%27%16%2
2442
January1st to 10thNight
53%8%15%16%6%1
4726
11th to 20thNight
48%7%13%17%13%1
4740
21st to endNight
48%7%16%22%7%1
5077
February1st to 10thNight
53%6%13%19%8%1
2660
11th to 20thNight
50%7%14%17%11%1
2419
21st to endNight
45%8%12%23%10%1
1951
March1st to 10thNight
52%8%13%19%7%
2157
11th to 20thNight
50%7%12%20%10%1
1980
21st to endNight
50%9%16%17%7%1
2178
April1st to 10thNight
44%10%13%20%13%1
1693
11th to 20thNight
52%8%11%19%8%3
1601
21st to endNight
46%8%13%20%11%2
1620
May1st to 10thNight
51%8%11%21%8%1
1360
11th to 20thNight
43%8%12%23%13%1
1239
21st to endNight
50%8%11%19%10%2
1358
June1st to 10thNight
50%9%13%21%6%1
1260
11th to 20thNight
55%11%14%15%5%
1260
21st to endNight
38%11%22%23%5%1
1260
July1st to 10thNight
37%11%19%25%6%1
1225
11th to 20thNight
38%14%23%20%6%
1218
21st to endNight
30%11%25%29%6%
1302
August1st to 10thNight
37%13%23%23%4
1343
11th to 20thNight
36%10%23%25%7%1
1563
21st to endNight
36%10%16%29%9%1
1782
September1st to 10thNight
35%9%19%24%10%3
1671
11th to 20thNight
37%6%16%30%9%3
1980
21st to endNight
36%9%15%24%14%3
1980
October1st to 10thNight
42%6%15%25%10%1
2106
11th to 20thNight
42%7%15%27%9%1
2276
21st to endNight
47%9%15%21%8%1
2591
November1st to 10thNight
53%9%12%20%6%1
2590
11th to 20thNight
53%8%13%18%7%1
2763
21st to endNight
51%8%16%18%6%1
2850
December1st to 10thNight
54%7%12%17%8%1
2850
11th to 20thNight
53%10%17%15%6%
3507
21st to endNight
36%7%16%21%16%4
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
9%6%29%32%18%6%
180
11th to 20thDay
9%9%31%33%17%2
180
21st to endDay
9%10%26%33%18%5%
198
February1st to 10thDay
14%11%27%33%12%4
180
11th to 20thDay
11%8%32%29%17%4
263
21st to endDay
5%7%27%34%21%6%
241
March1st to 10thDay
11%6%30%33%17%3
420
11th to 20thDay
10%5%32%31%15%6%
420
21st to endDay
14%426%31%21%4
462
April1st to 10thDay
8%12%29%33%15%4
420
11th to 20thDay
17%8%22%29%20%5%
412
21st to endDay
18%10%25%30%14%3
420
May1st to 10thDay
12%8%24%33%17%6%
574
11th to 20thDay
10%6%24%35%19%7%
625
21st to endDay
17%5%23%28%20%8%
679
June1st to 10thDay
17%9%23%32%15%4
630
11th to 20thDay
19%9%23%24%18%7%
630
21st to endDay
12%5%21%28%25%10%
630
July1st to 10thDay
12%317%33%26%10%
621
11th to 20thDay
11%5%20%30%26%8%
618
21st to endDay
9%5%18%33%25%10%
684
August1st to 10thDay
12%5%18%30%23%12%
526
11th to 20thDay
8%6%22%32%25%7%
437
21st to endDay
12%6%17%32%24%9%
495
September1st to 10thDay
15%6%30%28%15%6%
450
11th to 20thDay
19%6%24%32%16%4
450
21st to endDay
14%14%28%26%14%5%
450
October1st to 10thDay
19%8%26%26%16%5%
324
11th to 20thDay
12%8%30%31%16%2
270
21st to endDay
14%13%32%26%13%2
297
November1st to 10thDay
18%9%26%30%14%3
270
11th to 20thDay
10%7%38%33%11%1
221
21st to endDay
7%8%32%36%11%7%
180
December1st to 10thDay
8%8%29%31%17%6%
180
11th to 20thDay
9%9%27%37%16%2
180
21st to endDay
10%5%24%39%20%3
198
January1st to 10thNight
10%9%31%35%13%2
950
11th to 20thNight
10%8%32%37%10%2
950
21st to endNight
13%10%32%31%12%2
960
February1st to 10thNight
9%8%25%38%18%2
760
11th to 20thNight
10%6%32%35%16%1
744
21st to endNight
7%5%23%39%21%5%
610
March1st to 10thNight
10%6%25%38%18%3
720
11th to 20thNight
10%430%36%16%3
720
21st to endNight
14%5%26%36%16%3
792
April1st to 10thNight
10%7%26%34%21%3
613
11th to 20thNight
14%7%28%37%12%2
533
21st to endNight
16%8%22%36%16%1
540
May1st to 10thNight
16%6%22%36%19%2
432
11th to 20thNight
12%421%42%19%1
354
21st to endNight
20%5%24%31%17%3
389
June1st to 10thNight
18%6%24%33%16%3
360
11th to 20thNight
20%6%23%33%16%2
360
21st to endNight
11%220%40%23%4
360
July1st to 10thNight
14%416%41%25%1
350
11th to 20thNight
11%5%19%45%19%1
348
21st to endNight
10%316%43%24%3
394
August1st to 10thNight
12%316%35%29%5%
358
11th to 20thNight
12%418%37%28%2
495
21st to endNight
11%319%41%25%1
594
September1st to 10thNight
14%220%41%20%3
556
11th to 20thNight
16%422%40%17%2
720
21st to endNight
13%428%38%16%2
720
October1st to 10thNight
15%327%38%16%1
720
11th to 20thNight
13%5%32%34%15%1
720
21st to endNight
13%7%33%36%11%
809
November1st to 10thNight
18%7%30%33%11%1
925
11th to 20thNight
12%9%34%30%12%3
950
21st to endNight
8%6%40%33%11%2
950
December1st to 10thNight
13%7%33%30%14%4
950
11th to 20thNight
11%7%33%35%12%2
950
21st to endNight
9%431%37%16%3
1045
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