Rondeau Provincial Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rondeau Provincial Park clear sky chart from 2005-11-06 to 2024-01-31.

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
39%
23372
9%
74685
7%
23321
42%
23321
10%
60413

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
15%
864
4%
2564
1%
862
18%
862
4%
2275
January11th to 20thNight
16%
760
3%
2470
2%
760
19%
760
3%
2231
January21st to endNight
21%
835
4%
2711
2%
835
23%
835
5%
2363
February1st to 10thNight
20%
720
5%
2340
2%
720
24%
720
6%
2011
February11th to 20thNight
26%
700
6%
2226
3%
700
29%
700
6%
1893
February21st to endNight
23%
592
8%
1776
3%
592
28%
592
8%
1481
March1st to 10thNight
31%
720
11%
2052
6%
720
35%
720
11%
1640
March11th to 20thNight
34%
720
13%
1980
8%
720
39%
720
13%
1569
March21st to endNight
36%
792
11%
2178
7%
792
39%
792
11%
1791
April1st to 10thNight
38%
720
10%
1946
5%
720
40%
720
14%
1546
April11th to 20thNight
40%
538
14%
1602
8%
538
45%
538
14%
1242
April21st to endNight
46%
540
11%
1620
6%
540
50%
540
12%
1285
May1st to 10thNight
47%
540
8%
1620
7%
540
48%
540
12%
1298
May11th to 20thNight
47%
531
14%
1592
11%
531
50%
531
14%
1221
May21st to endNight
66%
488
12%
1651
13%
488
67%
488
16%
1191
June1st to 10thNight
57%
360
11%
1440
14%
360
61%
360
12%
1038
June11th to 20thNight
63%
360
15%
1274
18%
360
65%
360
16%
902
June21st to endNight
64%
360
15%
1260
15%
360
69%
360
14%
903
July1st to 10thNight
70%
455
12%
1330
13%
455
71%
455
18%
983
July11th to 20thNight
68%
522
11%
1515
11%
522
69%
522
18%
1109
July21st to endNight
68%
591
12%
1672
11%
558
69%
558
18%
1225
August1st to 10thNight
70%
537
11%
1600
10%
534
72%
534
17%
1184
August11th to 20thNight
69%
534
16%
1598
12%
534
71%
534
19%
1134
August21st to endNight
62%
594
16%
1782
12%
594
64%
594
19%
1281
September1st to 10thNight
58%
715
12%
1892
7%
715
61%
715
16%
1475
September11th to 20thNight
63%
720
17%
1980
12%
720
66%
720
19%
1461
September21st to endNight
50%
720
11%
1980
9%
720
52%
720
14%
1570
October1st to 10thNight
49%
720
12%
2092
11%
720
52%
720
15%
1606
October11th to 20thNight
35%
720
8%
2160
6%
720
39%
720
11%
1750
October21st to endNight
28%
792
8%
2423
5%
792
31%
792
9%
2006
November1st to 10thNight
37%
740
12%
2406
11%
740
40%
740
13%
1827
November11th to 20thNight
23%
760
10%
2531
7%
760
28%
760
7%
2094
November21st to endNight
23%
760
7%
2660
6%
760
26%
760
6%
2257
December1st to 10thNight
15%
760
2%
2660
1%
760
18%
760
3%
2374
December11th to 20thNight
17%
760
4%
3263
1%
759
21%
759
4%
2733
December21st to endNight
16%
832
1%
4839
1%
820
18%
820
1%
4464

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
14%8%46%6%35%5%6%8%35%
75161
Night
16%9%47%6%35%5%5%7%34%
74906
TransparencyDay
31%40%10%12%7%1
74875
Night
33%39%8%12%7%1
74713
SeeingDay
16%7%21%31%20%5%
13978
Night
20%8%24%29%16%3
23386

By Month

Percentage Cloud Cover SE (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
17%13%6%10%9%47%6%46%19%
1582
11th to 20thDay
18%15%7%11%9%5%5%5%45%16%
1710
21st to endDay
17%15%7%10%9%37%5%5%5%19%
1872
February1st to 10thDay
16%14%6%8%9%46%45%5%23%
1620
11th to 20thDay
15%9%5%9%9%5%7%5%5%6%25%
1618
21st to endDay
17%10%5%9%7%36%5%5%6%28%
1480
March1st to 10thDay
16%8%48%7%45%6%5%6%31%
1908
11th to 20thDay
14%9%5%8%6%445%5%6%33%
1980
21st to endDay
19%8%5%8%6%45%46%7%29%
2178
April1st to 10thDay
14%9%46%6%46%5%6%7%33%
2020
11th to 20thDay
17%7%45%5%35%5%6%7%35%
2312
21st to endDay
18%8%36%6%35%45%7%35%
2340
May1st to 10thDay
15%8%36%5%35%5%5%8%36%
2340
11th to 20thDay
16%7%36%5%445%5%8%37%
2301
21st to endDay
9%425%6%35%5%6%9%45%
2621
June1st to 10thDay
10%6%25%6%35%6%7%9%41%
2520
11th to 20thDay
9%435%6%35%6%6%10%43%
2680
21st to endDay
9%425%435%5%7%11%45%
2700
July1st to 10thDay
7%425%5%245%7%9%50%
2585
11th to 20thDay
10%5%244345%6%9%48%
2392
21st to endDay
7%4245%46%6%7%10%45%
2547
August1st to 10thDay
7%425%5%35%6%7%10%46%
2327
11th to 20thDay
8%5%245%35%7%7%10%42%
2303
21st to endDay
9%425%5%35%6%6%9%47%
2561
September1st to 10thDay
10%6%35%435%5%6%7%45%
2060
11th to 20thDay
9%4235%35%5%6%10%47%
1980
21st to endDay
16%5%345%45%5%6%7%41%
1980
October1st to 10thDay
13%6%26%6%35%45%6%42%
1868
11th to 20thDay
18%7%37%6%45%5%5%7%33%
1800
21st to endDay
22%8%47%6%35%5%5%7%28%
1931
November1st to 10thDay
12%9%46%7%35%46%7%36%
1672
11th to 20thDay
16%11%48%6%35%5%6%6%31%
1646
21st to endDay
20%14%6%8%6%245%5%7%22%
1520
December1st to 10thDay
18%15%6%9%7%45%6%5%7%18%
1520
11th to 20thDay
18%15%7%10%6%35%5%6%6%19%
1910
21st to endDay
28%19%7%8%7%35%445%11%
2777
January1st to 10thNight
20%12%5%9%7%45%5%46%23%
2564
11th to 20thNight
20%16%7%11%6%45%44419%
2470
21st to endNight
17%15%7%10%7%45%5%45%21%
2711
February1st to 10thNight
18%14%5%10%7%35%445%24%
2340
11th to 20thNight
17%12%5%9%6%45%5%5%6%26%
2224
21st to endNight
21%11%37%6%45%5%5%5%28%
1776
March1st to 10thNight
16%10%36%6%45%5%5%8%32%
2052
11th to 20thNight
15%7%46%6%245%5%7%39%
1980
21st to endNight
19%8%37%6%3445%6%34%
2178
April1st to 10thNight
15%10%46%6%4445%7%36%
1946
11th to 20thNight
18%6%36%6%45%45%7%37%
1602
21st to endNight
16%7%35%6%35%5%5%8%38%
1620
May1st to 10thNight
16%7%47%5%46%5%6%8%32%
1620
11th to 20thNight
14%7%37%5%45%45%7%38%
1592
21st to endNight
10%5%25%435%5%5%8%48%
1650
June1st to 10thNight
10%5%25%5%35%5%6%9%46%
1440
11th to 20thNight
10%425%6%336%8%9%44%
1274
21st to endNight
9%5%245%35%5%5%8%48%
1260
July1st to 10thNight
7%4245%3345%7%56%
1370
11th to 20thNight
8%4245%2445%9%51%
1565
21st to endNight
7%4145%446%7%10%48%
1771
August1st to 10thNight
7%415%435%5%7%8%51%
1611
11th to 20thNight
6%426%5%35%6%6%9%48%
1598
21st to endNight
9%5%244445%5%9%49%
1782
September1st to 10thNight
11%5%35%5%35%45%8%45%
1892
11th to 20thNight
10%5%2442445%8%52%
1980
21st to endNight
16%5%35%5%345%5%7%42%
1980
October1st to 10thNight
15%5%25%425%45%7%44%
2092
11th to 20thNight
18%7%37%5%345%47%35%
2160
21st to endNight
23%8%36%7%4445%7%30%
2423
November1st to 10thNight
14%7%36%6%345%5%6%41%
2406
11th to 20thNight
18%9%37%6%46%5%5%7%30%
2531
21st to endNight
22%12%47%6%3445%6%27%
2660
December1st to 10thNight
21%14%6%8%7%35%5%5%6%20%
2660
11th to 20thNight
18%14%5%9%7%35%5%5%5%24%
3285
21st to endNight
27%19%7%10%7%3434412%
4841

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
42%43%8%7%1
1583
11th to 20thDay
45%43%7%5%1
1710
21st to endDay
46%38%7%6%3
1872
February1st to 10thDay
40%39%9%9%3
1620
11th to 20thDay
39%40%8%7%5%
1627
21st to endDay
40%40%8%9%3
1480
March1st to 10thDay
34%40%10%13%4
1908
11th to 20thDay
34%39%8%11%7%1
1980
21st to endDay
36%39%9%12%41
2178
April1st to 10thDay
28%39%10%13%9%
2020
11th to 20thDay
30%39%9%13%9%1
2312
21st to endDay
33%38%9%13%6%2
2340
May1st to 10thDay
29%39%9%14%8%1
2340
11th to 20thDay
28%38%8%12%10%2
2305
21st to endDay
21%41%12%14%11%1
2621
June1st to 10thDay
24%41%11%15%9%1
2520
11th to 20thDay
21%39%11%16%11%1
2680
21st to endDay
21%40%12%16%10%1
2700
July1st to 10thDay
19%41%9%17%12%2
2516
11th to 20thDay
21%40%11%18%10%1
2320
21st to endDay
20%43%13%14%9%1
2405
August1st to 10thDay
22%40%12%18%7%
2314
11th to 20thDay
21%40%13%16%9%1
2303
21st to endDay
22%39%11%15%11%2
2561
September1st to 10thDay
25%40%10%15%9%2
2060
11th to 20thDay
20%39%13%19%8%
1980
21st to endDay
30%40%10%14%6%1
1980
October1st to 10thDay
27%39%9%16%8%1
1868
11th to 20thDay
34%40%11%11%41
1800
21st to endDay
35%41%10%9%5%
1931
November1st to 10thDay
25%44%8%14%7%1
1672
11th to 20thDay
32%43%10%10%5%1
1646
21st to endDay
38%43%8%10%2
1520
December1st to 10thDay
40%44%10%5%2
1520
11th to 20thDay
43%38%10%7%2
1906
21st to endDay
62%29%6%3
2777
January1st to 10thNight
42%42%7%7%2
2564
11th to 20thNight
44%43%6%6%2
2470
21st to endNight
44%38%8%8%2
2711
February1st to 10thNight
40%39%8%10%21
2340
11th to 20thNight
40%39%8%9%4
2226
21st to endNight
38%38%9%11%41
1776
March1st to 10thNight
32%38%9%15%6%
2052
11th to 20thNight
29%38%9%14%8%1
1980
21st to endNight
34%38%6%15%6%1
2178
April1st to 10thNight
30%37%8%13%10%1
1946
11th to 20thNight
29%37%8%14%10%2
1602
21st to endNight
32%37%7%11%11%2
1620
May1st to 10thNight
32%39%7%12%7%3
1620
11th to 20thNight
28%38%6%13%12%4
1593
21st to endNight
21%39%10%16%13%1
1651
June1st to 10thNight
24%39%9%15%10%3
1440
11th to 20thNight
20%40%10%15%14%2
1274
21st to endNight
22%39%9%17%13%1
1260
July1st to 10thNight
22%38%6%17%15%3
1330
11th to 20thNight
20%39%9%18%11%2
1515
21st to endNight
18%42%11%15%13%2
1672
August1st to 10thNight
21%40%11%20%8%1
1600
11th to 20thNight
19%38%10%20%11%2
1598
21st to endNight
19%38%9%20%13%2
1782
September1st to 10thNight
25%39%7%16%10%2
1892
11th to 20thNight
20%39%10%20%11%
1980
21st to endNight
29%38%9%15%9%1
1980
October1st to 10thNight
26%39%7%14%13%1
2092
11th to 20thNight
33%38%10%11%7%
2160
21st to endNight
36%39%9%11%5%1
2423
November1st to 10thNight
23%43%10%16%9%
2406
11th to 20thNight
33%43%9%10%5%1
2531
21st to endNight
36%43%8%11%2
2660
December1st to 10thNight
42%43%8%6%1
2660
11th to 20thNight
42%37%11%8%2
3288
21st to endNight
61%29%6%21
4841

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
23%11%36%20%9%1
270
11th to 20thDay
26%12%39%17%5%1
270
21st to endDay
28%11%29%28%41
294
February1st to 10thDay
21%11%36%29%3
240
11th to 20thDay
22%13%35%28%3
240
21st to endDay
22%9%41%25%4
198
March1st to 10thDay
18%10%31%32%8%1
348
11th to 20thDay
16%9%29%36%9%1
420
21st to endDay
24%7%27%31%9%1
462
April1st to 10thDay
14%7%32%33%13%1
420
11th to 20thDay
21%7%26%31%9%6%
412
21st to endDay
19%5%26%35%13%1
420
May1st to 10thDay
22%5%22%32%17%2
423
11th to 20thDay
17%219%34%24%4
447
21st to endDay
13%115%31%31%10%
485
June1st to 10thDay
11%413%43%25%5%
450
11th to 20thDay
11%117%36%30%4
610
21st to endDay
11%313%40%28%4
630
July1st to 10thDay
7%310%33%33%13%
621
11th to 20thDay
12%210%37%30%9%
493
21st to endDay
8%210%36%38%6%
488
August1st to 10thDay
8%38%37%32%13%
446
11th to 20thDay
9%5%11%30%36%9%
439
21st to endDay
9%314%32%32%11%
495
September1st to 10thDay
12%413%30%29%11%
450
11th to 20thDay
8%212%28%35%14%
450
21st to endDay
16%6%20%27%22%9%
450
October1st to 10thDay
15%7%22%25%22%9%
450
11th to 20thDay
18%13%27%29%11%2
450
21st to endDay
27%12%26%24%11%1
446
November1st to 10thDay
14%13%29%26%16%3
270
11th to 20thDay
25%13%26%27%8%1
239
21st to endDay
27%12%34%24%3
180
December1st to 10thDay
23%16%31%23%7%
180
11th to 20thDay
27%19%33%19%2
180
21st to endDay
28%20%29%19%4
212
January1st to 10thNight
26%15%36%17%6%1
866
11th to 20thNight
31%14%29%22%5%
760
21st to endNight
25%10%31%26%7%
835
February1st to 10thNight
27%9%34%27%4
720
11th to 20thNight
23%10%29%30%7%
703
21st to endNight
27%7%36%27%4
592
March1st to 10thNight
20%7%32%32%9%
720
11th to 20thNight
18%7%33%30%11%1
720
21st to endNight
21%6%29%31%11%2
792
April1st to 10thNight
19%7%28%35%10%1
720
11th to 20thNight
18%6%28%33%13%2
538
21st to endNight
18%5%22%41%13%2
540
May1st to 10thNight
18%422%33%20%3
540
11th to 20thNight
17%319%32%24%4
531
21st to endNight
12%112%36%32%6%
490
June1st to 10thNight
11%219%41%23%4
360
11th to 20thNight
13%114%38%31%2
360
21st to endNight
9%216%41%28%4
360
July1st to 10thNight
7%29%33%38%9%
455
11th to 20thNight
11%311%35%32%7%
522
21st to endNight
8%213%36%36%5%
591
August1st to 10thNight
9%29%37%35%9%
537
11th to 20thNight
7%312%32%38%8%
534
21st to endNight
10%315%31%34%7%
594
September1st to 10thNight
13%414%28%31%10%
715
11th to 20thNight
11%413%28%35%9%
720
21st to endNight
18%5%17%31%22%7%
720
October1st to 10thNight
19%6%21%28%20%6%
720
11th to 20thNight
22%11%26%26%13%2
720
21st to endNight
28%13%26%27%6%
792
November1st to 10thNight
19%12%25%27%15%2
740
11th to 20thNight
26%14%31%20%7%1
760
21st to endNight
28%16%28%20%7%
760
December1st to 10thNight
31%16%31%16%6%1
760
11th to 20thNight
25%17%33%21%4
760
21st to endNight
32%12%30%23%3
839
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