Haliburton Scout Reserve
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Haliburton Scout Reserve clear sky chart from 2005-11-05 to 2017-09-14.

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
27%
14681
13%
46732
7%
14649
34%
14649
16%
33502

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
10%
720
6%
2506
2%
716
16%
716
6%
2073
January16th to endNight
17%
768
12%
2547
5%
768
25%
768
10%
2002
February1st to 15thNight
13%
703
9%
2287
3%
701
20%
701
9%
1815
February16th to endNight
16%
631
13%
2018
4%
631
27%
631
11%
1527
March1st to 15thNight
15%
720
13%
2009
5%
720
23%
720
14%
1528
March16th to endNight
27%
768
20%
2098
9%
768
36%
768
24%
1416
April1st to 15thNight
19%
718
15%
1796
5%
718
25%
718
18%
1356
April16th to endNight
30%
588
18%
1668
9%
588
36%
588
23%
1149
May1st to 15thNight
35%
414
17%
1494
13%
414
43%
414
19%
958
May16th to endNight
36%
374
14%
1497
10%
374
48%
374
21%
881
June1st to 15thNight
34%
360
9%
1440
7%
360
44%
360
19%
907
June16th to endNight
43%
360
11%
1338
11%
360
49%
360
22%
845
July1st to 15thNight
47%
340
15%
1342
18%
340
54%
340
28%
732
July16th to endNight
49%
391
15%
1432
14%
368
56%
368
26%
811
August1st to 15thNight
54%
539
15%
1609
11%
536
59%
536
32%
982
August16th to endNight
51%
642
19%
1788
9%
642
57%
642
34%
1087
September1st to 15thNight
43%
716
16%
1790
6%
716
46%
716
30%
1199
September16th to endNight
43%
657
20%
1828
13%
657
47%
657
27%
1194
October1st to 15thNight
28%
660
17%
1980
10%
660
38%
660
19%
1394
October16th to endNight
19%
704
10%
2126
4%
704
26%
704
11%
1667
November1st to 15thNight
27%
700
16%
2411
13%
700
34%
700
15%
1680
November16th to endNight
17%
720
11%
2520
6%
720
23%
720
10%
1963
December1st to 15thNight
12%
720
5%
2520
1%
720
16%
720
6%
2112
December16th to endNight
10%
768
8%
2688
3%
768
17%
768
6%
2224

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
18%10%47%5%34446%29%
47974
Night
17%11%47%5%34446%30%
46904
Cloud CoverDay
18%11%47%6%34446%29%
47984
Night
16%11%47%5%34446%30%
46909
TransparencyDay
55%310%19%9%1
47664
Night
54%310%19%10%
46732
SeeingDay
25%13%29%20%8%3
5448
Night
24%13%29%22%9%1
14683

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 15thDay
21%18%7%9%6%23245%19%
1432
16th to endDay
14%16%7%12%8%35%425%19%
1674
February1st to 15thDay
13%17%7%14%9%5%424319%
1575
16th to endDay
16%17%5%10%5%4433423%
1455
March1st to 15thDay
15%12%5%9%7%34446%25%
1939
16th to endDay
14%10%5%6%5%3434436%
2125
April1st to 15thDay
22%13%35%5%23335%30%
2152
16th to endDay
21%9%35%313336%37%
2302
May1st to 15thDay
19%9%37%6%24345%31%
2457
16th to endDay
16%6%26%5%35%45%7%35%
2618
June1st to 15thDay
23%7%36%5%3445%7%28%
2520
16th to endDay
17%6%25%6%36%5%6%9%30%
2612
July1st to 15thDay
16%5%25%5%345%6%8%35%
2529
16th to endDay
13%6%47%7%35%5%5%8%33%
2636
August1st to 15thDay
14%7%27%7%36%5%6%6%32%
2340
16th to endDay
14%6%25%5%36%5%6%7%35%
2401
September1st to 15thDay
20%7%25%433446%37%
2146
16th to endDay
18%7%245%24346%39%
1802
October1st to 15thDay
26%8%45%433345%29%
1650
16th to endDay
32%12%36%6%2434419%
1746
November1st to 15thDay
19%13%46%5%33447%28%
1447
16th to endDay
23%19%7%9%5%2334417%
1440
December1st to 15thDay
20%22%7%11%7%2333414%
1440
16th to endDay
19%21%8%11%42332416%
1536
January1st to 15thNight
19%18%7%11%8%3323415%
2506
16th to endNight
13%16%7%10%7%34445%21%
2547
February1st to 15thNight
12%16%7%12%8%45%5%45%18%
2285
16th to endNight
15%14%5%8%7%35%445%24%
2018
March1st to 15thNight
17%12%47%7%3443430%
1997
16th to endNight
14%9%46%42445%6%39%
2098
April1st to 15thNight
20%14%45%43323431%
1796
16th to endNight
17%10%25%5%2335%6%37%
1668
May1st to 15thNight
19%7%16%42445%7%35%
1494
16th to endNight
12%6%25%5%245%5%7%41%
1495
June1st to 15thNight
16%8%35%42446%8%34%
1440
16th to endNight
14%7%25%5%25%5%5%6%39%
1338
July1st to 15thNight
10%315%5%25%45%6%48%
1422
16th to endNight
10%4244345%5%8%44%
1529
August1st to 15thNight
9%425%4245%5%8%46%
1620
16th to endNight
9%4245%3445%7%47%
1788
September1st to 15thNight
15%5%3442435%7%42%
1790
16th to endNight
18%6%24423245%44%
1828
October1st to 15thNight
21%7%36%5%3335%5%33%
1980
16th to endNight
26%13%47%5%23436%22%
2126
November1st to 15thNight
18%9%46%5%34446%31%
2411
16th to endNight
23%14%48%5%24435%22%
2520
December1st to 15thNight
21%22%6%10%5%3434413%
2520
16th to endNight
22%18%8%10%5%2334415%
2688

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 15thDay
20%18%7%9%7%23235%19%
1432
16th to endDay
14%16%7%12%8%45%335%19%
1674
February1st to 15thDay
12%18%7%14%9%4424319%
1575
16th to endDay
16%16%6%10%6%4433423%
1455
March1st to 15thDay
15%12%5%9%8%34445%25%
1950
16th to endDay
13%10%46%5%34435%36%
2124
April1st to 15thDay
22%13%35%5%23335%30%
2152
16th to endDay
21%10%35%413335%37%
2302
May1st to 15thDay
19%9%36%6%3435%6%31%
2457
16th to endDay
16%6%36%5%35%45%7%35%
2618
June1st to 15thDay
23%7%36%5%2445%7%28%
2520
16th to endDay
17%6%346%35%5%6%9%30%
2612
July1st to 15thDay
16%6%245%346%7%7%35%
2529
16th to endDay
13%6%37%7%45%5%5%9%32%
2636
August1st to 15thDay
14%6%36%6%46%5%6%6%32%
2340
16th to endDay
14%6%25%5%35%5%6%8%35%
2401
September1st to 15thDay
19%8%25%424446%37%
2146
16th to endDay
18%7%24425%336%39%
1802
October1st to 15thDay
25%10%35%5%34345%29%
1650
16th to endDay
31%12%46%6%2334419%
1746
November1st to 15thDay
18%13%47%423446%29%
1447
16th to endDay
22%19%6%9%5%2334417%
1440
December1st to 15thDay
19%21%8%11%6%3333414%
1440
16th to endDay
19%21%9%11%33333417%
1536
January1st to 15thNight
19%17%7%12%8%3423415%
2506
16th to endNight
14%16%7%10%8%35%445%21%
2547
February1st to 15thNight
12%15%7%11%8%45%5%45%19%
2278
16th to endNight
14%14%5%8%7%3445%5%24%
2018
March1st to 15thNight
17%13%47%7%3443429%
2009
16th to endNight
14%9%36%42435%5%39%
2098
April1st to 15thNight
20%14%46%43324432%
1796
16th to endNight
17%10%25%5%2335%6%37%
1668
May1st to 15thNight
19%7%25%42445%8%35%
1494
16th to endNight
12%6%25%435%5%5%8%41%
1495
June1st to 15thNight
16%7%45%42445%9%34%
1440
16th to endNight
13%8%25%5%25%5%5%5%39%
1338
July1st to 15thNight
9%415%5%25%45%7%47%
1422
16th to endNight
10%4245%3446%8%44%
1529
August1st to 15thNight
9%425%5%245%5%8%46%
1620
16th to endNight
9%5%245%3445%7%48%
1788
September1st to 15thNight
15%5%35%42345%7%42%
1790
16th to endNight
18%6%24423335%44%
1828
October1st to 15thNight
20%8%35%5%2335%6%33%
1980
16th to endNight
25%13%47%5%23436%22%
2126
November1st to 15thNight
18%9%46%5%35%446%31%
2411
16th to endNight
23%14%47%6%24445%22%
2520
December1st to 15thNight
20%22%6%10%6%3434413%
2520
16th to endNight
22%19%8%10%5%2334415%
2688

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
68%39%10%6%
1433
16th to endDay
68%35%11%8%1
1674
February1st to 15thDay
70%29%12%5%
1577
16th to endDay
65%27%12%11%
1455
March1st to 15thDay
60%312%15%7%1
1950
16th to endDay
50%37%18%15%4
2125
April1st to 15thDay
57%27%18%11%2
2152
16th to endDay
50%27%22%14%2
2302
May1st to 15thDay
53%38%19%13%1
2457
16th to endDay
48%410%21%13%1
2622
June1st to 15thDay
55%310%21%9%
2520
16th to endDay
49%412%20%11%1
2612
July1st to 15thDay
43%411%28%11%1
2380
16th to endDay
48%411%24%9%
2470
August1st to 15thDay
50%414%20%9%
2327
16th to endDay
45%413%27%8%
2401
September1st to 15thDay
48%312%24%11%
2146
16th to endDay
46%310%28%9%
1802
October1st to 15thDay
57%310%17%10%
1650
16th to endDay
68%39%11%5%
1746
November1st to 15thDay
56%413%17%7%1
1447
16th to endDay
70%28%11%41
1440
December1st to 15thDay
75%38%9%3
1440
16th to endDay
73%25%12%5%
1536
January1st to 15thNight
73%28%9%4
2506
16th to endNight
65%36%14%9%1
2547
February1st to 15thNight
67%310%12%6%
2287
16th to endNight
60%48%17%9%
2018
March1st to 15thNight
59%210%16%9%
2009
16th to endNight
45%38%22%16%2
2098
April1st to 15thNight
56%25%20%13%1
1796
16th to endNight
48%38%21%16%2
1668
May1st to 15thNight
47%310%20%16%2
1494
16th to endNight
40%413%24%15%1
1497
June1st to 15thNight
46%314%20%14%
1440
16th to endNight
44%313%26%11%
1338
July1st to 15thNight
34%412%28%19%
1342
16th to endNight
36%414%30%13%
1432
August1st to 15thNight
34%5%17%29%12%
1609
16th to endNight
35%416%32%10%1
1788
September1st to 15thNight
40%5%15%26%11%
1790
16th to endNight
42%311%31%10%
1828
October1st to 15thNight
51%310%21%12%
1980
16th to endNight
63%411%13%6%
2126
November1st to 15thNight
53%313%19%8%1
2411
16th to endNight
65%39%15%4
2520
December1st to 15thNight
74%39%10%2
2520
16th to endNight
73%27%9%5%
2688

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
28%26%31%11%1
60
16th to endDay
36%18%29%13%1
87
February1st to 15thDay
30%32%32%5%
90
16th to endDay
36%21%28%11%1
114
March1st to 15thDay
26%16%32%19%4
270
16th to endDay
23%17%32%15%7%2
288
April1st to 15thDay
29%18%29%16%5%
270
16th to endDay
28%18%24%14%11%1
270
May1st to 15thDay
34%9%26%17%8%5%
288
16th to endDay
23%16%32%17%8%1
331
June1st to 15thDay
29%12%29%20%6%1
315
16th to endDay
18%12%32%27%7%2
407
July1st to 15thDay
19%5%33%26%11%4
314
16th to endDay
17%7%34%24%11%4
326
August1st to 15thDay
16%428%31%11%7%
313
16th to endDay
20%7%23%27%12%8%
332
September1st to 15thDay
20%7%27%19%17%8%
310
16th to endDay
23%8%25%24%11%6%
254
October1st to 15thDay
27%16%22%22%8%2
255
16th to endDay
39%15%27%13%3
269
November1st to 15thDay
23%11%38%19%31
101
16th to endDay
43%11%26%18%
60
December1st to 15thDay
31%18%30%18%1
60
16th to endDay
31%39%26%11
64
January1st to 15thNight
32%19%29%14%4
720
16th to endNight
22%16%35%17%6%
768
February1st to 15thNight
23%17%36%18%3
704
16th to endNight
23%18%35%17%4
631
March1st to 15thNight
27%16%35%16%3
720
16th to endNight
20%14%32%20%10%1
768
April1st to 15thNight
28%17%30%18%5%
718
16th to endNight
23%13%30%21%10%
588
May1st to 15thNight
21%9%28%26%12%
414
16th to endNight
15%7%36%30%9%
375
June1st to 15thNight
21%8%27%32%9%
360
16th to endNight
16%8%25%37%11%
360
July1st to 15thNight
11%428%35%17%1
340
16th to endNight
10%5%28%36%18%
391
August1st to 15thNight
11%422%36%22%2
539
16th to endNight
11%5%25%32%22%2
642
September1st to 15thNight
18%7%25%27%16%3
716
16th to endNight
23%6%21%30%15%2
657
October1st to 15thNight
24%12%28%22%11%1
660
16th to endNight
35%15%24%18%4
704
November1st to 15thNight
24%14%28%23%8%1
700
16th to endNight
35%12%28%18%4
720
December1st to 15thNight
32%20%30%12%3
720
16th to endNight
32%17%30%14%2
768
Page generated at 2017-09-15 10:29:58. Version ac04

Copyright 2017 A. Danko


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