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 2005-11-06 to 2025-08-05.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	16% 12% 4 9% 5% 4 4 3 5% 6% 30%	126354
	Night	16% 13% 5% 10% 5% 4 4 3 5% 6% 29%	121646
Transparency	Day	55% 2 10% 21% 10% 1	129909
	Night	57% 3 9% 19% 10% 1	126178
Seeing	Day	25% 17% 30% 18% 7% 2	15454
	Night	24% 14% 30% 23% 9% 1	24508

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 17% 5% 15% 6% 5% 5% 4 5% 5% 22%	3597
	11th to 20th	Day	10% 20% 11% 19% 8% 6% 4 2 3 4 13%	3593
	21st to end	Day	12% 19% 10% 16% 8% 4 4 3 3 4 18%	4466
February	1st to 10th	Day	12% 19% 7% 17% 9% 5% 3 3 4 4 19%	1800
	11th to 20th	Day	12% 16% 8% 14% 6% 6% 4 2 4 4 24%	1753
	21st to end	Day	16% 18% 5% 11% 6% 6% 4 4 4 4 21%	1540
March	1st to 10th	Day	18% 16% 4 12% 6% 3 4 3 5% 6% 25%	4833
	11th to 20th	Day	12% 16% 5% 11% 6% 5% 5% 4 5% 7% 25%	4980
	21st to end	Day	18% 16% 5% 8% 3 4 3 2 3 4 35%	5524
April	1st to 10th	Day	19% 15% 4 8% 5% 4 4 2 5% 6% 28%	2400
	11th to 20th	Day	22% 13% 3 6% 4 3 3 3 3 4 34%	2410
	21st to end	Day	22% 13% 4 7% 4 3 3 3 3 6% 32%	2600
May	1st to 10th	Day	21% 9% 3 7% 5% 4 4 3 5% 7% 32%	6153
	11th to 20th	Day	18% 9% 3 7% 4 4 4 3 5% 6% 36%	6318
	21st to end	Day	21% 9% 2 7% 5% 4 5% 3 5% 6% 33%	6949
June	1st to 10th	Day	22% 8% 3 7% 5% 5% 4 4 5% 7% 31%	2800
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 6% 8% 35%	2800
	21st to end	Day	18% 7% 3 7% 5% 5% 5% 4 6% 8% 32%	2953
July	1st to 10th	Day	15% 6% 2 7% 5% 5% 5% 4 7% 9% 36%	6387
	11th to 20th	Day	12% 6% 2 6% 4 4 4 3 5% 7% 45%	6360
	21st to end	Day	8% 6% 2 6% 4 4 4 4 6% 9% 46%	6847
August	1st to 10th	Day	16% 8% 3 8% 5% 5% 5% 4 6% 6% 33%	4156
	11th to 20th	Day	18% 7% 2 7% 5% 5% 6% 4 7% 7% 33%	4044
	21st to end	Day	10% 6% 2 6% 4 5% 6% 5% 7% 9% 40%	4311
September	1st to 10th	Day	18% 7% 2 6% 4 4 5% 3 5% 7% 39%	2280
	11th to 20th	Day	14% 7% 2 6% 4 5% 4 3 5% 7% 44%	2251
	21st to end	Day	20% 8% 3 6% 5% 5% 4 3 6% 6% 35%	2000
October	1st to 10th	Day	22% 9% 3 8% 4 4 3 3 5% 6% 32%	1900
	11th to 20th	Day	25% 13% 3 8% 5% 5% 5% 2 4 5% 24%	1900
	21st to end	Day	28% 15% 4 8% 5% 3 4 3 4 5% 21%	2066
November	1st to 10th	Day	17% 15% 3 7% 5% 4 4 3 4 7% 30%	1637
	11th to 20th	Day	17% 18% 6% 10% 5% 5% 4 3 5% 6% 22%	1600
	21st to end	Day	20% 23% 7% 11% 5% 4 4 2 3 4 15%	1600
December	1st to 10th	Day	17% 25% 8% 13% 6% 5% 4 4 4 4 12%	2600
	11th to 20th	Day	17% 22% 8% 17% 4 3 2 2 3 3 19%	2986
	21st to end	Day	21% 22% 8% 12% 5% 3 3 2 3 4 18%	3960
January	1st to 10th	Night	14% 17% 8% 16% 6% 5% 4 3 5% 5% 18%	6349
	11th to 20th	Night	10% 17% 8% 23% 11% 6% 4 3 4 4 11%	6287
	21st to end	Night	12% 17% 9% 18% 6% 6% 4 3 4 4 16%	6490
February	1st to 10th	Night	12% 19% 7% 13% 7% 6% 5% 4 5% 5% 18%	2600
	11th to 20th	Night	12% 15% 7% 14% 6% 5% 4 3 4 5% 25%	2533
	21st to end	Night	13% 17% 5% 11% 7% 5% 6% 4 5% 6% 22%	2090
March	1st to 10th	Night	16% 16% 5% 12% 5% 4 3 3 4 5% 27%	5004
	11th to 20th	Night	9% 14% 6% 11% 5% 5% 5% 5% 6% 7% 26%	4979
	21st to end	Night	18% 11% 5% 9% 5% 4 4 3 5% 6% 30%	5407
April	1st to 10th	Night	20% 16% 4 8% 5% 4 2 3 4 5% 29%	2000
	11th to 20th	Night	18% 13% 3 7% 4 3 3 2 5% 4 37%	1956
	21st to end	Night	20% 12% 3 7% 5% 4 4 3 5% 6% 31%	1800
May	1st to 10th	Night	22% 8% 2 7% 5% 4 5% 4 5% 7% 32%	3787
	11th to 20th	Night	16% 7% 2 6% 4 3 4 4 5% 8% 41%	3575
	21st to end	Night	18% 10% 3 6% 4 4 4 3 5% 7% 36%	3926
June	1st to 10th	Night	16% 9% 3 6% 5% 4 4 3 6% 8% 35%	1600
	11th to 20th	Night	13% 7% 2 5% 4 4 4 4 6% 7% 43%	1600
	21st to end	Night	17% 9% 3 7% 5% 3 3 4 5% 6% 39%	1429
July	1st to 10th	Night	13% 7% 2 7% 5% 5% 5% 4 6% 8% 37%	3546
	11th to 20th	Night	14% 7% 2 5% 3 4 4 3 5% 6% 46%	3600
	21st to end	Night	10% 6% 2 5% 4 3 4 3 4 7% 52%	3988
August	1st to 10th	Night	11% 5% 2 6% 4 4 5% 5% 5% 7% 47%	2861
	11th to 20th	Night	16% 10% 2 6% 3 4 4 3 4 7% 41%	2785
	21st to end	Night	13% 5% 2 5% 4 4 4 3 6% 8% 47%	3311
September	1st to 10th	Night	13% 7% 2 6% 4 4 4 3 5% 7% 46%	1900
	11th to 20th	Night	13% 6% 2 6% 3 3 4 2 5% 6% 48%	1927
	21st to end	Night	19% 8% 3 6% 4 3 4 3 4 6% 40%	2179
October	1st to 10th	Night	20% 9% 3 6% 4 4 4 3 5% 6% 37%	2280
	11th to 20th	Night	23% 12% 4 7% 6% 4 4 3 4 5% 28%	2280
	21st to end	Night	23% 15% 4 9% 5% 3 4 4 4 6% 24%	2532
November	1st to 10th	Night	19% 14% 3 8% 4 5% 3 3 5% 5% 31%	2661
	11th to 20th	Night	18% 15% 5% 9% 5% 4 4 4 5% 6% 26%	2800
	21st to end	Night	20% 19% 5% 11% 6% 4 4 3 4 5% 19%	2800
December	1st to 10th	Night	18% 24% 8% 13% 5% 4 4 3 4 5% 12%	4580
	11th to 20th	Night	16% 24% 7% 16% 5% 4 3 3 3 4 16%	5208
	21st to end	Night	22% 21% 7% 13% 6% 3 3 2 3 4 15%	6996

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	65% 3 7% 16% 8% 1	3598
	11th to 20th	Day	78% 1 5% 9% 6% 1	3623
	21st to end	Day	73% 1 5% 10% 8% 2	4466
February	1st to 10th	Day	70% 3 6% 14% 6% 1	1800
	11th to 20th	Day	65% 3 8% 13% 10% 2	1762
	21st to end	Day	66% 3 7% 13% 10% 1	1540
March	1st to 10th	Day	62% 2 10% 10% 14% 2	4836
	11th to 20th	Day	60% 2 12% 16% 7% 2	4980
	21st to end	Day	56% 1 6% 20% 15% 2	5524
April	1st to 10th	Day	59% 2 7% 19% 11% 2	2400
	11th to 20th	Day	56% 3 6% 21% 14% 1	2410
	21st to end	Day	56% 3 7% 18% 13% 3	2600
May	1st to 10th	Day	54% 2 7% 22% 10% 5%	6162
	11th to 20th	Day	51% 2 9% 22% 16% 1	6322
	21st to end	Day	53% 2 11% 19% 12% 3	6949
June	1st to 10th	Day	54% 3 9% 21% 13% 1	2800
	11th to 20th	Day	46% 4 11% 26% 12% 2	2800
	21st to end	Day	50% 4 12% 22% 11% 1	2953
July	1st to 10th	Day	45% 3 14% 28% 10% 1	6318
	11th to 20th	Day	39% 3 12% 33% 14%	6285
	21st to end	Day	35% 3 15% 35% 12%	6650
August	1st to 10th	Day	51% 3 13% 23% 9% 1	4143
	11th to 20th	Day	49% 3 13% 27% 7%	4083
	21st to end	Day	39% 4 12% 34% 10% 1	4311
September	1st to 10th	Day	45% 4 11% 27% 11% 1	2280
	11th to 20th	Day	41% 3 12% 29% 14% 1	2251
	21st to end	Day	51% 4 11% 23% 12%	2000
October	1st to 10th	Day	50% 3 10% 26% 9% 1	3160
	11th to 20th	Day	56% 2 10% 20% 11% 1	3140
	21st to end	Day	63% 2 11% 17% 5%	3380
November	1st to 10th	Day	56% 3 13% 21% 6% 1	1637
	11th to 20th	Day	63% 4 10% 14% 8% 1	1600
	21st to end	Day	74% 3 7% 10% 5% 1	1600
December	1st to 10th	Day	78% 2 9% 8% 3	2600
	11th to 20th	Day	74% 2 4 13% 7% 1	2986
	21st to end	Day	73% 2 4 13% 8%	3960
January	1st to 10th	Night	71% 3 6% 14% 6%	6349
	11th to 20th	Night	79% 1 5% 8% 6% 1	6332
	21st to end	Night	73% 2 5% 9% 10% 1	6490
February	1st to 10th	Night	67% 4 8% 13% 7% 1	2600
	11th to 20th	Night	63% 3 7% 17% 9%	2535
	21st to end	Night	63% 4 6% 17% 9% 1	2090
March	1st to 10th	Night	62% 2 7% 12% 12% 5%	5014
	11th to 20th	Night	57% 3 14% 17% 8% 1	4980
	21st to end	Night	56% 2 6% 20% 13% 2	5407
April	1st to 10th	Night	59% 2 6% 19% 12% 2	2000
	11th to 20th	Night	51% 2 7% 23% 15% 1	1956
	21st to end	Night	55% 3 7% 18% 15% 2	1800
May	1st to 10th	Night	53% 2 8% 20% 13% 4	3794
	11th to 20th	Night	43% 3 12% 24% 17% 2	3576
	21st to end	Night	50% 2 11% 23% 13% 1	3927
June	1st to 10th	Night	48% 4 11% 23% 14% 1	1600
	11th to 20th	Night	40% 3 12% 28% 16% 1	1600
	21st to end	Night	47% 3 14% 23% 12% 1	1429
July	1st to 10th	Night	46% 3 15% 22% 14% 1	3506
	11th to 20th	Night	39% 3 11% 32% 14%	3552
	21st to end	Night	34% 3 11% 38% 14%	3870
August	1st to 10th	Night	37% 4 16% 27% 15% 2	2850
	11th to 20th	Night	45% 3 16% 25% 10% 1	2812
	21st to end	Night	36% 4 13% 34% 11% 2	3311
September	1st to 10th	Night	38% 5% 14% 29% 13% 1	1900
	11th to 20th	Night	38% 2 13% 33% 13% 1	1927
	21st to end	Night	46% 4 10% 28% 12%	2179
October	1st to 10th	Night	41% 3 10% 28% 18%	3800
	11th to 20th	Night	53% 2 13% 22% 10%	3779
	21st to end	Night	57% 3 16% 17% 7% 1	4168
November	1st to 10th	Night	55% 3 12% 21% 8%	2661
	11th to 20th	Night	59% 4 11% 18% 7% 1	2800
	21st to end	Night	69% 3 9% 14% 5%	2800
December	1st to 10th	Night	76% 2 11% 9% 2	4580
	11th to 20th	Night	74% 2 6% 11% 7%	5208
	21st to end	Night	76% 2 4 10% 8%	6996

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	20% 29% 33% 13% 5% 1	200
	11th to 20th	Day	26% 21% 35% 14% 3	205
	21st to end	Day	25% 22% 35% 14% 3	330
February	1st to 10th	Day	29% 29% 31% 8% 2	300
	11th to 20th	Day	31% 31% 32% 6%	300
	21st to end	Day	37% 21% 35% 8%	304
March	1st to 10th	Day	27% 20% 35% 14% 2	500
	11th to 20th	Day	27% 21% 32% 14% 4 1	500
	21st to end	Day	34% 20% 29% 13% 4 1	550
April	1st to 10th	Day	31% 21% 30% 12% 6% 1	500
	11th to 20th	Day	37% 20% 21% 15% 5% 2	492
	21st to end	Day	32% 18% 31% 12% 7% 1	500
May	1st to 10th	Day	28% 16% 30% 17% 6% 3	503
	11th to 20th	Day	23% 16% 33% 17% 9% 2	527
	21st to end	Day	23% 18% 30% 18% 8% 3	573
June	1st to 10th	Day	26% 15% 33% 20% 5% 1	530
	11th to 20th	Day	18% 14% 34% 22% 9% 2	530
	21st to end	Day	21% 14% 32% 23% 8% 1	683
July	1st to 10th	Day	15% 9% 33% 29% 10% 2	540
	11th to 20th	Day	18% 10% 32% 26% 11% 3	524
	21st to end	Day	17% 11% 34% 26% 10% 3	576
August	1st to 10th	Day	15% 8% 32% 30% 10% 5%	502
	11th to 20th	Day	18% 7% 25% 31% 14% 5%	479
	21st to end	Day	18% 11% 30% 24% 12% 5%	539
September	1st to 10th	Day	18% 13% 29% 22% 12% 5%	490
	11th to 20th	Day	16% 9% 23% 22% 19% 10%	490
	21st to end	Day	24% 13% 26% 23% 11% 3	490
October	1st to 10th	Day	27% 17% 23% 18% 11% 3	490
	11th to 20th	Day	32% 22% 28% 14% 3 1	490
	21st to end	Day	37% 19% 27% 14% 3	526
November	1st to 10th	Day	32% 16% 33% 15% 3 1	271
	11th to 20th	Day	32% 21% 31% 14% 3 2	200
	21st to end	Day	34% 21% 36% 8% 2 1	200
December	1st to 10th	Day	32% 19% 34% 15% 2 1	200
	11th to 20th	Day	39% 24% 25% 11% 2 1	200
	21st to end	Day	30% 24% 30% 11% 4 1	220
January	1st to 10th	Night	29% 19% 33% 15% 4 1	800
	11th to 20th	Night	30% 17% 32% 16% 5%	800
	21st to end	Night	20% 16% 36% 20% 6% 1	880
February	1st to 10th	Night	22% 24% 33% 19% 2	800
	11th to 20th	Night	23% 20% 38% 16% 3	783
	21st to end	Night	25% 21% 33% 17% 3	660
March	1st to 10th	Night	25% 19% 36% 16% 4	800
	11th to 20th	Night	23% 19% 36% 18% 4 1	800
	21st to end	Night	23% 16% 32% 20% 8%	880
April	1st to 10th	Night	29% 18% 29% 19% 5%	800
	11th to 20th	Night	27% 16% 29% 18% 9% 1	772
	21st to end	Night	25% 13% 30% 22% 10%	600
May	1st to 10th	Night	22% 10% 26% 30% 11% 1	490
	11th to 20th	Night	19% 9% 34% 30% 8%	394
	21st to end	Night	16% 11% 32% 29% 11% 1	433
June	1st to 10th	Night	20% 8% 34% 31% 7% 1	400
	11th to 20th	Night	17% 11% 26% 34% 13% 1	400
	21st to end	Night	22% 8% 24% 33% 13%	400
July	1st to 10th	Night	11% 7% 28% 36% 17% 1	390
	11th to 20th	Night	14% 6% 27% 35% 18% 1	388
	21st to end	Night	10% 7% 29% 37% 17%	463
August	1st to 10th	Night	12% 5% 22% 36% 23% 2	579
	11th to 20th	Night	13% 4 19% 39% 23% 2	564
	21st to end	Night	16% 7% 27% 30% 19% 2	736
September	1st to 10th	Night	15% 9% 27% 29% 17% 3	760
	11th to 20th	Night	18% 6% 22% 30% 20% 4	760
	21st to end	Night	25% 9% 21% 27% 15% 3	760
October	1st to 10th	Night	23% 12% 27% 23% 13% 1	760
	11th to 20th	Night	30% 16% 28% 19% 7% 1	760
	21st to end	Night	35% 16% 26% 19% 4	836
November	1st to 10th	Night	28% 15% 27% 24% 6%	780
	11th to 20th	Night	29% 15% 33% 16% 6% 1	800
	21st to end	Night	33% 17% 28% 18% 4 1	800
December	1st to 10th	Night	33% 19% 30% 14% 4	800
	11th to 20th	Night	29% 19% 33% 15% 3 1	800
	21st to end	Night	34% 19% 28% 15% 3	880

Page generated at 2025-08-02 01:32:26. Version ac07

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