Cold Creek Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cold Creek Conservation Area clear sky chart from 2005-11-06 to 2024-11-02.

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
30%
23681
13%
94891
8%
23474
37%
23474
14%
64785

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%
753
8%
4407
4%
737
22%
737
5%
3314
January11th to 20thNight
15%
758
6%
4172
2%
740
20%
740
4%
3438
January21st to endNight
18%
832
6%
4529
5%
814
25%
814
6%
3697
February1st to 10thNight
13%
760
10%
2470
3%
760
22%
760
10%
1884
February11th to 20thNight
14%
740
12%
2405
3%
740
25%
740
11%
1820
February21st to endNight
17%
628
11%
1984
3%
628
26%
628
12%
1440
March1st to 10thNight
18%
757
17%
3405
5%
744
27%
744
10%
2355
March11th to 20thNight
22%
756
15%
3466
7%
740
31%
740
11%
2119
March21st to endNight
24%
834
13%
3699
7%
814
34%
814
15%
2177
April1st to 10thNight
20%
760
13%
1944
4%
760
26%
760
18%
1451
April11th to 20thNight
26%
677
17%
1801
6%
677
32%
677
22%
1274
April21st to endNight
30%
570
15%
1710
6%
570
37%
570
21%
1172
May1st to 10thNight
37%
565
17%
2786
9%
559
44%
559
16%
1713
May11th to 20thNight
38%
392
13%
2512
15%
387
53%
387
13%
1540
May21st to endNight
47%
404
13%
2709
14%
399
58%
399
18%
1268
June1st to 10thNight
38%
380
14%
1520
12%
380
50%
380
21%
891
June11th to 20thNight
45%
380
15%
1473
16%
380
54%
380
24%
843
June21st to endNight
46%
380
16%
1330
17%
380
54%
380
26%
785
July1st to 10thNight
58%
367
18%
2145
19%
360
67%
360
23%
1032
July11th to 20thNight
51%
360
16%
2105
24%
358
60%
358
20%
1110
July21st to endNight
58%
587
13%
2599
13%
550
63%
550
23%
1436
August1st to 10thNight
58%
557
19%
2524
13%
545
63%
545
22%
1474
August11th to 20thNight
59%
553
18%
2550
16%
543
65%
543
23%
1451
August21st to endNight
50%
681
15%
2939
11%
673
56%
673
22%
1694
September1st to 10thNight
50%
760
19%
1900
8%
760
55%
760
34%
1222
September11th to 20thNight
54%
760
26%
2023
15%
760
60%
760
38%
1206
September21st to endNight
45%
760
19%
2118
14%
760
48%
760
25%
1440
October1st to 10thNight
37%
760
18%
2280
13%
760
44%
760
22%
1558
October11th to 20thNight
29%
760
13%
2280
8%
760
36%
760
18%
1615
October21st to endNight
22%
836
14%
2508
8%
836
31%
836
14%
1857
November1st to 10thNight
29%
745
17%
2486
12%
745
37%
745
19%
1658
November11th to 20thNight
22%
760
13%
2660
6%
760
32%
760
13%
1910
November21st to endNight
21%
760
8%
2660
5%
760
26%
760
11%
2023
December1st to 10thNight
14%
760
7%
2660
3%
760
18%
760
9%
2102
December11th to 20thNight
14%
760
5%
3258
2%
758
19%
758
7%
2565
December21st to endNight
10%
829
3%
4874
0%
817
16%
817
3%
4251

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%10%38%5%5%5%46%7%32%
101816
Night
14%10%48%6%5%5%45%6%33%
97094
TransparencyDay
48%8%13%19%10%1
101583
Night
47%9%13%20%10%1
96948
SeeingDay
19%15%31%21%10%3
14741
Night
19%12%32%26%10%1
23792

By Month

Percentage Cloud Cover NE (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
16%15%5%11%6%5%5%35%6%23%
2517
11th to 20thDay
11%20%7%16%9%6%4335%14%
2758
21st to endDay
20%21%7%12%7%4333416%
3124
February1st to 10thDay
14%17%5%12%8%7%6%45%419%
1710
11th to 20thDay
11%15%6%14%8%5%5%45%5%22%
1663
21st to endDay
16%17%5%12%5%46%345%24%
1465
March1st to 10thDay
17%14%5%9%5%5%4345%29%
3432
11th to 20thDay
11%16%5%11%5%6%5%445%28%
3480
21st to endDay
15%11%38%5%5%5%445%35%
3815
April1st to 10thDay
15%15%49%6%45%35%6%28%
2234
11th to 20thDay
19%10%37%444346%36%
2344
21st to endDay
20%9%38%5%4435%6%33%
2470
May1st to 10thDay
17%8%37%44446%8%34%
4108
11th to 20thDay
16%9%38%6%5%5%45%8%31%
4359
21st to endDay
12%5%26%5%45%46%7%45%
4837
June1st to 10thDay
14%7%36%5%45%6%6%8%36%
2660
11th to 20thDay
12%5%26%5%45%47%10%40%
2698
21st to endDay
14%5%26%5%5%5%47%8%38%
2850
July1st to 10thDay
11%5%26%5%6%6%5%7%10%38%
4610
11th to 20thDay
10%425%5%5%6%47%10%42%
4440
21st to endDay
8%6%26%6%6%6%5%7%8%39%
4484
August1st to 10thDay
15%7%26%5%46%47%9%35%
4104
11th to 20thDay
10%7%39%6%5%6%5%7%9%33%
4044
21st to endDay
9%6%27%5%5%5%46%10%40%
4379
September1st to 10thDay
13%7%26%5%6%6%46%7%39%
2280
11th to 20thDay
11%6%27%5%45%45%8%44%
2154
21st to endDay
15%6%38%7%5%5%46%7%34%
2061
October1st to 10thDay
18%9%28%5%5%4347%33%
1900
11th to 20thDay
20%10%39%6%5%435%6%28%
1900
21st to endDay
25%13%49%5%45%35%5%21%
2090
November1st to 10thDay
13%13%47%5%5%6%46%7%29%
1608
11th to 20thDay
13%15%49%6%7%5%46%8%23%
1520
21st to endDay
17%16%7%10%7%6%5%45%6%18%
1520
December1st to 10thDay
16%18%6%14%8%6%4445%15%
1520
11th to 20thDay
17%17%5%12%6%46%46%419%
1906
21st to endDay
27%18%6%16%5%4434310%
2772
January1st to 10thNight
17%15%6%12%6%6%5%446%19%
4429
11th to 20thNight
13%15%6%13%10%8%7%45%5%13%
4184
21st to endNight
19%14%6%11%10%6%5%45%5%16%
4532
February1st to 10thNight
12%16%5%10%7%6%5%45%6%24%
2470
11th to 20thNight
12%14%5%10%7%6%5%45%6%25%
2403
21st to endNight
12%13%411%6%6%5%46%6%28%
1984
March1st to 10thNight
17%11%49%5%5%5%45%5%30%
3408
11th to 20thNight
12%12%38%5%5%5%45%6%35%
3479
21st to endNight
15%7%26%5%45%35%6%42%
3817
April1st to 10thNight
18%12%48%5%5%445%6%31%
1944
11th to 20thNight
15%10%26%44446%6%38%
1801
21st to endNight
15%11%36%5%45%5%5%7%35%
1710
May1st to 10thNight
16%8%36%5%4435%6%40%
2833
11th to 20thNight
15%8%27%445%45%8%39%
2532
21st to endNight
9%5%35%34436%8%51%
2738
June1st to 10thNight
12%6%25%6%5%5%5%5%9%41%
1520
11th to 20thNight
9%427%445%5%6%10%43%
1473
21st to endNight
11%5%26%5%4337%7%46%
1330
July1st to 10thNight
5%426%5%4446%10%50%
2334
11th to 20thNight
11%415%435%35%7%52%
2520
21st to endNight
6%425%45%5%47%8%51%
3052
August1st to 10thNight
10%6%26%5%4435%7%49%
2825
11th to 20thNight
10%5%36%44335%8%49%
2785
21st to endNight
10%6%25%45%436%9%46%
3244
September1st to 10thNight
8%5%26%445%47%7%48%
1900
11th to 20thNight
10%5%1433435%7%53%
2023
21st to endNight
16%6%27%5%4435%7%40%
2118
October1st to 10thNight
17%7%27%45%5%46%6%38%
2280
11th to 20thNight
17%9%38%5%5%5%45%6%34%
2280
21st to endNight
20%10%38%6%5%5%46%6%27%
2508
November1st to 10thNight
16%9%38%5%5%435%7%36%
2486
11th to 20thNight
16%13%38%6%5%5%47%6%28%
2660
21st to endNight
18%13%49%6%5%5%45%7%23%
2660
December1st to 10thNight
20%16%49%5%6%6%36%7%19%
2660
11th to 20thNight
14%18%6%10%6%6%5%45%6%19%
3288
21st to endNight
27%18%5%12%6%5%5%34411%
4884

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
56%11%16%11%6%
2518
11th to 20thDay
69%8%11%8%3
2758
21st to endDay
70%8%10%8%41
3124
February1st to 10thDay
63%10%9%14%31
1710
11th to 20thDay
58%9%12%13%6%1
1672
21st to endDay
60%8%11%14%7%1
1465
March1st to 10thDay
54%9%13%15%9%
3435
11th to 20thDay
51%10%11%18%8%1
3480
21st to endDay
46%9%12%18%13%2
3815
April1st to 10thDay
55%7%11%17%10%1
2234
11th to 20thDay
48%6%11%20%14%1
2344
21st to endDay
50%7%12%17%11%2
2470
May1st to 10thDay
45%9%13%18%13%1
4120
11th to 20thDay
47%12%14%19%8%1
4363
21st to endDay
34%10%14%22%18%3
4837
June1st to 10thDay
42%9%12%20%14%1
2660
11th to 20thDay
36%9%15%23%15%1
2698
21st to endDay
40%9%14%23%13%1
2850
July1st to 10thDay
39%5%15%24%15%2
4540
11th to 20thDay
34%6%13%35%11%1
4365
21st to endDay
38%7%15%21%17%1
4341
August1st to 10thDay
44%7%14%21%13%1
4091
11th to 20thDay
43%7%16%23%10%
4083
21st to endDay
38%6%13%32%10%1
4379
September1st to 10thDay
40%9%15%25%10%1
2280
11th to 20thDay
35%8%15%28%13%
2154
21st to endDay
46%9%13%24%8%
2061
October1st to 10thDay
49%8%13%18%11%1
1900
11th to 20thDay
52%9%13%18%7%1
1900
21st to endDay
62%8%12%13%5%
2090
November1st to 10thDay
49%10%14%18%8%1
1608
11th to 20thDay
54%10%14%13%8%
1520
21st to endDay
62%10%15%12%2
1520
December1st to 10thDay
67%10%12%9%2
1520
11th to 20thDay
61%12%14%10%4
1906
21st to endDay
76%8%8%7%1
2772
January1st to 10thNight
60%10%14%12%3
4429
11th to 20thNight
64%14%11%8%3
4184
21st to endNight
63%12%12%8%41
4532
February1st to 10thNight
57%9%12%17%5%
2470
11th to 20thNight
56%9%11%16%8%
2405
21st to endNight
53%8%15%16%8%
1984
March1st to 10thNight
50%9%13%20%6%1
3418
11th to 20thNight
42%10%16%21%10%2
3480
21st to endNight
40%7%12%23%17%2
3817
April1st to 10thNight
52%6%11%17%12%1
1944
11th to 20thNight
45%8%10%20%15%2
1801
21st to endNight
45%8%13%17%15%2
1710
May1st to 10thNight
41%9%14%17%16%3
2840
11th to 20thNight
41%11%14%21%10%2
2533
21st to endNight
29%8%16%23%22%2
2739
June1st to 10thNight
37%8%13%23%17%2
1520
11th to 20thNight
34%8%13%23%20%2
1473
21st to endNight
36%7%14%25%17%1
1330
July1st to 10thNight
29%5%15%25%21%4
2295
11th to 20thNight
31%413%35%16%1
2472
21st to endNight
30%7%15%31%15%2
2955
August1st to 10thNight
36%414%29%15%2
2814
11th to 20thNight
34%5%16%32%12%1
2812
21st to endNight
36%5%12%33%13%1
3244
September1st to 10thNight
32%9%15%28%14%1
1900
11th to 20thNight
29%8%12%33%18%
2023
21st to endNight
42%8%13%26%11%
2118
October1st to 10thNight
44%9%11%20%16%1
2280
11th to 20thNight
47%9%14%22%8%
2280
21st to endNight
53%8%13%16%9%
2508
November1st to 10thNight
45%7%16%20%11%1
2486
11th to 20thNight
51%10%15%16%8%1
2660
21st to endNight
56%10%17%13%3
2660
December1st to 10thNight
61%10%14%12%3
2660
11th to 20thNight
61%10%14%12%3
3288
21st to endNight
72%11%9%6%2
4884

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
22%21%32%21%41
180
11th to 20thDay
25%26%31%13%4
249
21st to endDay
25%24%33%15%3
297
February1st to 10thDay
28%27%31%11%3
270
11th to 20thDay
24%30%39%7%1
270
21st to endDay
37%26%27%9%
230
March1st to 10thDay
22%21%35%16%5%
460
11th to 20thDay
23%20%38%15%4
460
21st to endDay
29%19%31%15%5%1
506
April1st to 10thDay
22%22%35%15%6%
460
11th to 20thDay
31%21%27%12%7%2
452
21st to endDay
26%17%36%14%6%2
460
May1st to 10thDay
23%13%31%20%9%4
463
11th to 20thDay
17%15%29%24%12%3
487
21st to endDay
15%12%28%29%12%5%
529
June1st to 10thDay
14%17%31%28%9%2
490
11th to 20thDay
16%13%30%27%12%2
528
21st to endDay
16%10%34%28%8%3
680
July1st to 10thDay
10%8%32%31%16%4
590
11th to 20thDay
12%8%29%30%15%7%
484
21st to endDay
10%7%32%32%13%7%
532
August1st to 10thDay
13%8%26%28%17%9%
486
11th to 20thDay
10%6%28%27%20%9%
479
21st to endDay
13%8%28%25%19%6%
539
September1st to 10thDay
14%8%28%27%13%9%
490
11th to 20thDay
9%8%24%24%21%13%
490
21st to endDay
16%11%30%22%15%6%
490
October1st to 10thDay
21%15%27%20%13%4
490
11th to 20thDay
20%20%35%18%6%2
490
21st to endDay
31%19%29%18%4
539
November1st to 10thDay
25%21%28%19%7%1
253
11th to 20thDay
23%24%32%16%41
180
21st to endDay
26%20%42%11%1
180
December1st to 10thDay
29%22%31%15%2
180
11th to 20thDay
26%27%29%16%21
180
21st to endDay
30%24%34%10%2
198
January1st to 10thNight
24%21%34%17%4
760
11th to 20thNight
26%18%32%20%3
760
21st to endNight
20%13%39%22%6%
836
February1st to 10thNight
19%20%40%19%2
760
11th to 20thNight
21%19%38%18%3
743
21st to endNight
21%20%38%18%3
628
March1st to 10thNight
21%19%37%21%3
760
11th to 20thNight
22%20%33%20%6%
760
21st to endNight
21%15%36%22%7%
836
April1st to 10thNight
25%14%37%21%3
760
11th to 20thNight
19%15%37%20%8%1
677
21st to endNight
20%11%33%27%8%
570
May1st to 10thNight
18%6%31%31%12%2
570
11th to 20thNight
16%8%32%33%11%1
398
21st to endNight
10%7%30%36%16%
411
June1st to 10thNight
13%7%33%34%12%1
380
11th to 20thNight
11%9%30%36%14%
380
21st to endNight
12%5%29%39%14%
380
July1st to 10thNight
7%426%43%20%1
370
11th to 20thNight
11%329%36%19%2
368
21st to endNight
7%326%42%20%2
602
August1st to 10thNight
11%120%42%25%1
567
11th to 20thNight
8%420%41%25%2
564
21st to endNight
13%326%32%23%2
695
September1st to 10thNight
12%7%27%32%19%4
760
11th to 20thNight
13%424%29%25%5%
760
21st to endNight
19%7%22%31%18%4
760
October1st to 10thNight
20%9%29%25%15%2
760
11th to 20thNight
21%13%33%23%9%1
760
21st to endNight
25%14%33%24%4
836
November1st to 10thNight
23%13%32%24%9%1
745
11th to 20thNight
21%19%32%21%6%1
760
21st to endNight
25%15%33%23%4
760
December1st to 10thNight
29%17%35%15%3
760
11th to 20thNight
22%18%40%18%3
760
21st to endNight
33%15%33%17%2
836
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