Camp Kawartha
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Kawartha clear sky chart from 2005-11-06 to 2026-09-29.

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% 10% 3 8% 5% 5% 4 4 5% 7% 34%	149899
	Night	15% 11% 4 9% 5% 5% 4 4 5% 6% 32%	141490
Transparency	Day	49% 6% 12% 21% 11% 1	153467
	Night	50% 6% 12% 20% 11% 1	146009
Seeing	Day	23% 16% 31% 19% 8% 3	16829
	Night	21% 14% 31% 24% 9% 1	26033

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	16% 13% 5% 11% 5% 4 5% 4 5% 6% 26%	4661
	11th to 20th	Day	10% 22% 8% 16% 9% 7% 5% 3 4 4 15%	4747
	21st to end	Day	12% 16% 6% 15% 7% 8% 5% 3 4 5% 18%	5780
February	1st to 10th	Day	14% 15% 6% 13% 7% 5% 5% 4 4 4 23%	1890
	11th to 20th	Day	13% 15% 6% 13% 7% 5% 4 3 3 5% 26%	1843
	21st to end	Day	17% 16% 4 10% 8% 5% 4 3 4 6% 23%	1630
March	1st to 10th	Day	20% 12% 5% 10% 5% 3 3 3 4 6% 29%	4940
	11th to 20th	Day	12% 13% 5% 10% 5% 5% 5% 4 6% 7% 27%	5090
	21st to end	Day	19% 12% 3 6% 4 4 4 3 4 5% 37%	5650
April	1st to 10th	Day	21% 12% 3 8% 4 4 4 3 5% 5% 31%	2520
	11th to 20th	Day	23% 9% 3 5% 5% 3 4 3 4 5% 37%	2508
	21st to end	Day	21% 10% 3 7% 4 4 4 3 4 6% 33%	2730
May	1st to 10th	Day	21% 8% 2 7% 5% 4 5% 4 5% 7% 35%	7935
	11th to 20th	Day	17% 9% 3 7% 4 4 5% 4 5% 7% 35%	8221
	21st to end	Day	19% 8% 2 6% 4 4 4 3 5% 7% 39%	9060
June	1st to 10th	Day	17% 8% 2 7% 5% 5% 5% 4 6% 7% 34%	2940
	11th to 20th	Day	14% 6% 2 6% 5% 5% 6% 4 7% 8% 37%	2940
	21st to end	Day	15% 7% 3 7% 4 4 5% 4 6% 7% 36%	2940
July	1st to 10th	Day	12% 6% 2 6% 4 5% 5% 4 7% 10% 39%	8280
	11th to 20th	Day	10% 5% 2 4 4 4 4 4 6% 9% 49%	8280
	21st to end	Day	9% 5% 2 5% 4 5% 5% 4 7% 9% 43%	8840
August	1st to 10th	Day	17% 8% 3 7% 4 5% 4 3 5% 6% 37%	6014
	11th to 20th	Day	13% 5% 3 6% 4 4 5% 4 7% 9% 39%	5951
	21st to end	Day	13% 7% 3 7% 5% 5% 5% 4 7% 9% 35%	6224
September	1st to 10th	Day	14% 6% 2 7% 5% 4 4 4 5% 8% 42%	2520
	11th to 20th	Day	11% 5% 2 6% 4 4 5% 4 6% 7% 48%	2494
	21st to end	Day	16% 7% 3 7% 4 4 3 4 5% 7% 39%	2186
October	1st to 10th	Day	17% 10% 3 8% 4 4 4 3 6% 7% 35%	2000
	11th to 20th	Day	22% 9% 2 9% 5% 4 4 4 6% 6% 28%	2000
	21st to end	Day	25% 11% 3 9% 5% 4 4 3 4 6% 25%	2185
November	1st to 10th	Day	16% 10% 3 7% 5% 5% 4 4 5% 7% 32%	1746
	11th to 20th	Day	15% 14% 3 8% 5% 5% 5% 4 6% 6% 28%	1680
	21st to end	Day	21% 16% 4 9% 4 5% 5% 3 6% 5% 21%	1680
December	1st to 10th	Day	17% 22% 6% 11% 5% 5% 4 3 4 5% 17%	2680
	11th to 20th	Day	17% 18% 7% 11% 5% 4 4 3 4 4 24%	3066
	21st to end	Day	23% 18% 5% 11% 5% 4 4 2 4 4 20%	4048
January	1st to 10th	Night	14% 17% 6% 13% 6% 5% 5% 3 5% 5% 20%	8234
	11th to 20th	Night	11% 18% 7% 16% 8% 6% 5% 4 4 5% 16%	8134
	21st to end	Night	12% 14% 6% 13% 6% 5% 5% 4 5% 6% 24%	8401
February	1st to 10th	Night	12% 16% 6% 10% 6% 6% 6% 4 5% 5% 24%	2730
	11th to 20th	Night	13% 15% 5% 12% 7% 5% 5% 4 4 5% 26%	2663
	21st to end	Night	16% 12% 4 10% 5% 5% 5% 4 6% 6% 28%	2176
March	1st to 10th	Night	17% 13% 4 10% 5% 5% 4 3 5% 6% 29%	5116
	11th to 20th	Night	11% 11% 4 8% 5% 5% 5% 5% 7% 7% 31%	5089
	21st to end	Night	20% 9% 3 7% 4 4 3 3 4 6% 36%	5524
April	1st to 10th	Night	19% 11% 4 9% 5% 4 4 3 5% 6% 31%	2100
	11th to 20th	Night	18% 8% 4 7% 4 4 4 4 4 7% 36%	2075
	21st to end	Night	17% 8% 3 7% 5% 5% 5% 4 6% 6% 34%	1894
May	1st to 10th	Night	22% 8% 3 6% 4 4 4 3 5% 6% 34%	4964
	11th to 20th	Night	15% 7% 3 7% 5% 4 4 4 5% 7% 41%	4639
	21st to end	Night	18% 7% 2 6% 4 4 4 3 5% 7% 40%	5114
June	1st to 10th	Night	14% 6% 3 7% 5% 4 4 4 6% 8% 39%	1680
	11th to 20th	Night	12% 6% 2 6% 5% 4 5% 4 5% 8% 43%	1680
	21st to end	Night	13% 7% 3 7% 5% 5% 6% 4 4 7% 39%	1680
July	1st to 10th	Night	9% 6% 2 7% 5% 5% 6% 4 6% 8% 43%	4680
	11th to 20th	Night	9% 4 2 5% 3 4 4 3 6% 8% 51%	4680
	21st to end	Night	11% 6% 2 5% 4 4 4 4 5% 8% 47%	5219
August	1st to 10th	Night	14% 7% 2 6% 4 4 4 4 6% 7% 42%	4135
	11th to 20th	Night	13% 6% 2 5% 4 3 3 3 5% 8% 49%	4095
	21st to end	Night	11% 7% 3 6% 4 4 5% 3 6% 8% 43%	4854
September	1st to 10th	Night	11% 5% 2 6% 4 4 4 3 6% 9% 45%	2100
	11th to 20th	Night	11% 3 1 4 4 4 4 3 5% 6% 54%	2122
	21st to end	Night	17% 6% 3 6% 4 4 4 3 5% 6% 43%	2390
October	1st to 10th	Night	16% 6% 3 8% 4 5% 4 3 5% 7% 40%	2400
	11th to 20th	Night	21% 10% 3 8% 5% 4 4 4 4 6% 32%	2400
	21st to end	Night	22% 11% 3 7% 5% 5% 5% 3 5% 6% 29%	2655
November	1st to 10th	Night	18% 11% 3 7% 4 4 4 3 5% 6% 35%	2769
	11th to 20th	Night	17% 13% 4 8% 5% 5% 5% 4 5% 7% 29%	2940
	21st to end	Night	20% 12% 4 8% 5% 6% 5% 4 5% 7% 23%	2940
December	1st to 10th	Night	18% 16% 5% 11% 6% 5% 5% 4 6% 6% 17%	4720
	11th to 20th	Night	16% 16% 6% 13% 5% 5% 4 4 5% 6% 19%	5348
	21st to end	Night	25% 18% 5% 13% 5% 4 4 3 3 4 17%	7150

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	56% 6% 12% 17% 8% 1	4662
	11th to 20th	Day	73% 5% 7% 8% 7%	4777
	21st to end	Day	68% 4 9% 10% 8% 1	5780
February	1st to 10th	Day	63% 6% 10% 15% 5% 1	1890
	11th to 20th	Day	62% 5% 9% 13% 10% 1	1852
	21st to end	Day	62% 6% 9% 14% 9% 1	1630
March	1st to 10th	Day	56% 5% 12% 12% 14% 1	4943
	11th to 20th	Day	53% 7% 16% 15% 7% 2	5090
	21st to end	Day	49% 5% 9% 20% 16% 2	5650
April	1st to 10th	Day	54% 5% 9% 19% 10% 2	2520
	11th to 20th	Day	50% 5% 9% 20% 15% 1	2508
	21st to end	Day	52% 6% 9% 19% 12% 3	2730
May	1st to 10th	Day	48% 6% 11% 19% 13% 3	7944
	11th to 20th	Day	46% 7% 11% 18% 16%	8225
	21st to end	Day	44% 6% 10% 25% 13% 2	9061
June	1st to 10th	Day	47% 8% 12% 18% 15% 1	2940
	11th to 20th	Day	41% 8% 13% 24% 13% 1	2940
	21st to end	Day	44% 8% 14% 21% 12% 1	2940
July	1st to 10th	Day	39% 6% 16% 25% 12% 1	8210
	11th to 20th	Day	31% 5% 13% 34% 16% 1	8205
	21st to end	Day	35% 7% 15% 33% 10%	8644
August	1st to 10th	Day	47% 6% 13% 18% 14% 2	6001
	11th to 20th	Day	39% 7% 18% 29% 7%	5990
	21st to end	Day	42% 7% 16% 27% 8% 1	6224
September	1st to 10th	Day	39% 8% 13% 29% 10% 1	2520
	11th to 20th	Day	33% 7% 14% 31% 14% 1	2494
	21st to end	Day	44% 7% 13% 24% 11% 1	2186
October	1st to 10th	Day	42% 6% 12% 28% 12% 1	3260
	11th to 20th	Day	46% 6% 15% 20% 12% 1	3240
	21st to end	Day	52% 7% 15% 19% 7%	3511
November	1st to 10th	Day	49% 7% 15% 20% 9% 1	1746
	11th to 20th	Day	53% 8% 15% 14% 9% 1	1680
	21st to end	Day	63% 8% 13% 12% 5%	1680
December	1st to 10th	Day	69% 6% 13% 9% 4	2680
	11th to 20th	Day	64% 6% 9% 12% 8%	3066
	21st to end	Day	67% 6% 8% 13% 7%	4048
January	1st to 10th	Night	63% 7% 10% 13% 7%	8234
	11th to 20th	Night	69% 6% 10% 8% 6% 1	8179
	21st to end	Night	59% 5% 10% 11% 14%	8401
February	1st to 10th	Night	59% 6% 12% 16% 6% 1	2730
	11th to 20th	Night	58% 6% 10% 18% 7%	2665
	21st to end	Night	54% 7% 12% 19% 8% 1	2176
March	1st to 10th	Night	55% 5% 8% 16% 11% 4	5126
	11th to 20th	Night	47% 8% 18% 17% 8% 1	5090
	21st to end	Night	47% 6% 10% 21% 14% 2	5524
April	1st to 10th	Night	52% 6% 9% 19% 12% 2	2100
	11th to 20th	Night	46% 7% 10% 20% 15% 1	2075
	21st to end	Night	47% 8% 10% 18% 15% 2	1894
May	1st to 10th	Night	49% 6% 11% 18% 13% 3	4971
	11th to 20th	Night	41% 8% 12% 22% 15% 1	4640
	21st to end	Night	43% 6% 11% 23% 15% 2	5115
June	1st to 10th	Night	41% 7% 12% 21% 17% 1	1680
	11th to 20th	Night	36% 8% 12% 23% 19% 2	1680
	21st to end	Night	43% 7% 14% 22% 13% 2	1680
July	1st to 10th	Night	37% 6% 19% 24% 13% 1	4640
	11th to 20th	Night	31% 5% 14% 32% 16% 1	4632
	21st to end	Night	35% 6% 12% 32% 15%	5100
August	1st to 10th	Night	41% 5% 14% 21% 15% 3	4124
	11th to 20th	Night	34% 6% 19% 30% 10% 1	4122
	21st to end	Night	37% 7% 14% 31% 10% 1	4854
September	1st to 10th	Night	35% 8% 15% 28% 12% 1	2100
	11th to 20th	Night	30% 7% 14% 33% 16% 1	2122
	21st to end	Night	42% 6% 12% 26% 13% 1	2390
October	1st to 10th	Night	34% 6% 11% 28% 20% 1	3920
	11th to 20th	Night	45% 7% 13% 26% 9%	3899
	21st to end	Night	48% 6% 14% 24% 8%	4279
November	1st to 10th	Night	48% 6% 14% 21% 10% 1	2769
	11th to 20th	Night	53% 7% 13% 17% 8% 2	2940
	21st to end	Night	58% 10% 14% 15% 4	2940
December	1st to 10th	Night	65% 7% 12% 12% 3	4720
	11th to 20th	Night	65% 6% 11% 12% 6%	5348
	21st to end	Night	70% 6% 8% 10% 7%	7150

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	22% 24% 35% 15% 3 1	220
	11th to 20th	Day	30% 23% 31% 13% 3 1	237
	21st to end	Day	26% 24% 33% 13% 4	363
February	1st to 10th	Day	34% 21% 30% 12% 3 1	330
	11th to 20th	Day	32% 25% 37% 6% 1	330
	21st to end	Day	37% 19% 36% 9%	346
March	1st to 10th	Day	25% 22% 35% 14% 3	540
	11th to 20th	Day	30% 21% 30% 15% 2 1	540
	21st to end	Day	34% 19% 29% 12% 6% 1	594
April	1st to 10th	Day	30% 21% 33% 10% 6%	540
	11th to 20th	Day	35% 20% 22% 14% 6% 3	532
	21st to end	Day	30% 18% 32% 13% 6% 1	540
May	1st to 10th	Day	25% 19% 31% 16% 5% 4	543
	11th to 20th	Day	21% 14% 37% 16% 9% 3	567
	21st to end	Day	20% 16% 32% 18% 10% 4	617
June	1st to 10th	Day	19% 14% 36% 22% 7% 1	570
	11th to 20th	Day	17% 14% 32% 23% 11% 3	570
	21st to end	Day	21% 13% 34% 21% 9% 2	570
July	1st to 10th	Day	11% 8% 34% 31% 12% 3	565
	11th to 20th	Day	13% 11% 31% 25% 15% 6%	564
	21st to end	Day	11% 9% 37% 28% 12% 4	620
August	1st to 10th	Day	13% 9% 29% 29% 14% 6%	566
	11th to 20th	Day	11% 8% 30% 30% 14% 7%	559
	21st to end	Day	12% 10% 34% 25% 12% 7%	627
September	1st to 10th	Day	17% 11% 28% 24% 13% 7%	570
	11th to 20th	Day	10% 9% 29% 22% 18% 12%	570
	21st to end	Day	18% 14% 27% 26% 11% 4	562
October	1st to 10th	Day	22% 17% 25% 17% 14% 5%	530
	11th to 20th	Day	24% 21% 33% 15% 6% 2	530
	21st to end	Day	31% 21% 27% 17% 4	575
November	1st to 10th	Day	28% 18% 29% 18% 6%	320
	11th to 20th	Day	29% 25% 30% 11% 4 1	220
	21st to end	Day	32% 19% 35% 13% 1	220
December	1st to 10th	Day	30% 25% 29% 14% 3	220
	11th to 20th	Day	35% 24% 25% 14% 1 1	220
	21st to end	Day	35% 19% 34% 9% 2 1	242
January	1st to 10th	Night	27% 23% 29% 15% 5%	840
	11th to 20th	Night	28% 17% 32% 18% 4	840
	21st to end	Night	20% 18% 34% 23% 5% 1	924
February	1st to 10th	Night	22% 22% 35% 19% 2	840
	11th to 20th	Night	23% 18% 38% 18% 3	823
	21st to end	Night	25% 22% 33% 18% 2	692
March	1st to 10th	Night	23% 19% 35% 19% 3	840
	11th to 20th	Night	23% 20% 34% 19% 4 1	840
	21st to end	Night	22% 16% 34% 20% 7%	924
April	1st to 10th	Night	26% 17% 33% 19% 4	840
	11th to 20th	Night	25% 16% 31% 20% 7% 1	831
	21st to end	Night	22% 11% 32% 26% 8% 1	634
May	1st to 10th	Night	23% 8% 30% 26% 11% 2	530
	11th to 20th	Night	14% 11% 37% 29% 9%	414
	21st to end	Night	14% 9% 32% 34% 11% 1	455
June	1st to 10th	Night	16% 7% 35% 30% 12%	420
	11th to 20th	Night	13% 10% 30% 35% 11%	420
	21st to end	Night	14% 9% 29% 35% 13%	420
July	1st to 10th	Night	7% 7% 27% 44% 15%	410
	11th to 20th	Night	9% 4 33% 33% 20% 1	408
	21st to end	Night	11% 4 31% 39% 14% 2	507
August	1st to 10th	Night	12% 4 22% 38% 23% 2	627
	11th to 20th	Night	11% 5% 20% 38% 24% 2	624
	21st to end	Night	12% 6% 30% 32% 19% 2	833
September	1st to 10th	Night	12% 8% 30% 29% 17% 3	840
	11th to 20th	Night	12% 5% 23% 31% 24% 4	840
	21st to end	Night	19% 10% 23% 29% 17% 2	833
October	1st to 10th	Night	18% 12% 29% 24% 16% 2	800
	11th to 20th	Night	25% 16% 31% 20% 8% 1	800
	21st to end	Night	28% 16% 30% 22% 4	880
November	1st to 10th	Night	27% 13% 27% 24% 8% 1	820
	11th to 20th	Night	24% 18% 34% 18% 6% 1	840
	21st to end	Night	30% 16% 30% 20% 5%	840
December	1st to 10th	Night	28% 20% 33% 15% 4	840
	11th to 20th	Night	24% 22% 35% 15% 4	840
	21st to end	Night	34% 16% 31% 15% 3	924

Page generated at 2026-09-26 04:18:40. Version ac07

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