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 2025-05-26.

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% 11% 4 8% 5% 4 4 4 5% 7% 32%	114217
	Night	16% 11% 4 9% 5% 5% 4 4 5% 6% 31%	115049
Transparency	Day	49% 7% 12% 20% 11% 1	117832
	Night	50% 7% 12% 19% 11% 1	119597
Seeing	Day	23% 16% 31% 19% 8% 3	15057
	Night	21% 14% 31% 24% 9% 1	24437

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	13% 14% 5% 9% 5% 4 5% 4 5% 6% 30%	3597
	11th to 20th	Day	10% 19% 7% 17% 8% 6% 6% 3 4 4 17%	3639
	21st to end	Day	15% 18% 7% 14% 6% 6% 4 3 4 5% 19%	4466
February	1st to 10th	Day	14% 15% 6% 13% 7% 5% 5% 4 4 4 23%	1800
	11th to 20th	Day	13% 15% 6% 13% 6% 5% 4 3 3 5% 27%	1753
	21st to end	Day	17% 16% 4 10% 8% 5% 4 3 4 6% 24%	1555
March	1st to 10th	Day	20% 12% 5% 10% 5% 3 3 3 4 6% 29%	4833
	11th to 20th	Day	12% 13% 5% 10% 5% 5% 5% 4 6% 7% 27%	4980
	21st to end	Day	19% 12% 3 6% 3 4 3 3 4 5% 38%	5528
April	1st to 10th	Day	21% 12% 3 8% 4 4 4 3 5% 6% 32%	2400
	11th to 20th	Day	23% 9% 3 5% 5% 3 4 2 4 5% 37%	2387
	21st to end	Day	21% 10% 3 7% 4 4 4 3 4 6% 33%	2600
May	1st to 10th	Day	19% 7% 2 7% 5% 5% 4 4 5% 7% 35%	4398
	11th to 20th	Day	16% 10% 3 7% 5% 4 5% 4 6% 8% 32%	4538
	21st to end	Day	14% 7% 2 6% 5% 4 4 4 5% 8% 42%	4907
June	1st to 10th	Day	17% 8% 3 7% 5% 5% 5% 4 6% 8% 32%	2660
	11th to 20th	Day	14% 6% 2 6% 5% 5% 6% 4 7% 8% 38%	2660
	21st to end	Day	16% 8% 3 7% 5% 4 5% 4 6% 7% 36%	2660
July	1st to 10th	Day	11% 5% 2 6% 5% 5% 6% 4 7% 10% 38%	4440
	11th to 20th	Day	12% 5% 2 5% 4 4 5% 4 6% 9% 44%	4440
	21st to end	Day	8% 5% 2 6% 5% 5% 6% 5% 7% 9% 42%	4731
August	1st to 10th	Day	16% 8% 3 7% 4 4 5% 3 6% 7% 37%	4104
	11th to 20th	Day	16% 6% 3 7% 5% 4 5% 5% 7% 8% 35%	4044
	21st to end	Day	9% 6% 2 6% 5% 5% 4 5% 6% 9% 41%	4282
September	1st to 10th	Day	14% 7% 2 7% 5% 4 4 4 5% 8% 41%	2280
	11th to 20th	Day	11% 5% 2 6% 4 4 5% 4 6% 6% 48%	2256
	21st to end	Day	16% 7% 3 7% 4 4 3 4 5% 7% 39%	1996
October	1st to 10th	Day	17% 11% 3 9% 4 4 4 3 6% 7% 33%	1900
	11th to 20th	Day	23% 9% 2 8% 5% 5% 4 4 6% 6% 28%	1900
	21st to end	Day	25% 11% 3 9% 5% 4 4 3 4 6% 25%	2076
November	1st to 10th	Day	16% 10% 3 8% 5% 5% 4 4 5% 7% 33%	1661
	11th to 20th	Day	15% 14% 3 8% 6% 5% 5% 4 6% 6% 28%	1600
	21st to end	Day	21% 16% 4 9% 4 5% 5% 3 6% 6% 21%	1600
December	1st to 10th	Day	17% 22% 6% 11% 5% 5% 4 4 3 5% 17%	2600
	11th to 20th	Day	18% 17% 7% 11% 5% 4 4 3 4 4 24%	2986
	21st to end	Day	23% 18% 5% 11% 5% 4 4 2 4 4 20%	3960
January	1st to 10th	Night	15% 16% 5% 12% 6% 5% 5% 3 5% 6% 22%	6349
	11th to 20th	Night	12% 15% 7% 17% 8% 6% 5% 4 5% 6% 16%	6242
	21st to end	Night	14% 15% 7% 15% 5% 5% 4 3 4 5% 22%	6490
February	1st to 10th	Night	12% 16% 6% 10% 7% 6% 6% 4 5% 5% 23%	2600
	11th to 20th	Night	13% 15% 5% 11% 7% 4 5% 4 5% 5% 27%	2533
	21st to end	Night	16% 12% 4 9% 5% 5% 4 4 6% 6% 28%	2075
March	1st to 10th	Night	17% 13% 4 10% 6% 5% 4 3 5% 6% 29%	5004
	11th to 20th	Night	11% 11% 4 8% 5% 5% 5% 5% 7% 7% 31%	4979
	21st to end	Night	20% 9% 3 7% 4 4 3 3 4 6% 37%	5404
April	1st to 10th	Night	18% 11% 4 9% 5% 4 4 3 5% 6% 31%	2000
	11th to 20th	Night	18% 8% 4 7% 4 4 4 4 4 7% 37%	1975
	21st to end	Night	17% 8% 3 7% 6% 5% 5% 4 6% 6% 33%	1804
May	1st to 10th	Night	20% 8% 3 7% 4 4 5% 3 5% 5% 36%	2763
	11th to 20th	Night	16% 8% 2 6% 5% 5% 4 4 6% 7% 37%	2575
	21st to end	Night	11% 7% 2 6% 4 4 4 3 5% 8% 46%	2784
June	1st to 10th	Night	14% 6% 3 7% 5% 5% 4 4 6% 9% 38%	1520
	11th to 20th	Night	12% 5% 2 5% 5% 4 5% 4 5% 8% 44%	1520
	21st to end	Night	13% 7% 3 7% 5% 5% 6% 4 4 7% 39%	1520
July	1st to 10th	Night	8% 5% 2 7% 5% 5% 6% 4 6% 7% 45%	2520
	11th to 20th	Night	13% 5% 2 5% 4 3 4 3 5% 7% 49%	2520
	21st to end	Night	9% 5% 2 5% 4 3 4 4 5% 8% 50%	2818
August	1st to 10th	Night	12% 6% 2 5% 4 4 3 4 5% 8% 47%	2825
	11th to 20th	Night	15% 6% 2 5% 4 3 3 3 5% 8% 46%	2785
	21st to end	Night	10% 5% 2 5% 4 4 5% 4 5% 8% 48%	3341
September	1st to 10th	Night	11% 6% 2 6% 4 4 5% 3 6% 9% 44%	1900
	11th to 20th	Night	12% 3 1 4 4 4 4 3 5% 7% 53%	1920
	21st to end	Night	17% 6% 3 6% 4 4 4 3 4 6% 43%	2183
October	1st to 10th	Night	16% 7% 3 8% 4 5% 4 3 5% 7% 38%	2280
	11th to 20th	Night	21% 10% 3 8% 5% 4 4 4 5% 6% 31%	2280
	21st to end	Night	23% 12% 3 7% 5% 5% 4 3 5% 6% 27%	2522
November	1st to 10th	Night	18% 10% 3 7% 4 4 4 3 5% 5% 36%	2634
	11th to 20th	Night	17% 12% 4 7% 5% 5% 5% 4 5% 7% 30%	2800
	21st to end	Night	20% 12% 4 8% 5% 6% 5% 4 5% 7% 23%	2800
December	1st to 10th	Night	19% 16% 5% 11% 6% 5% 5% 4 5% 6% 17%	4580
	11th to 20th	Night	17% 16% 6% 13% 5% 5% 4 4 5% 6% 18%	5208
	21st to end	Night	25% 18% 5% 12% 5% 4 4 3 3 4 17%	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	52% 7% 11% 20% 9% 1	3598
	11th to 20th	Day	69% 6% 9% 9% 7%	3669
	21st to end	Day	68% 5% 8% 10% 8% 1	4466
February	1st to 10th	Day	63% 6% 10% 15% 4 1	1800
	11th to 20th	Day	61% 5% 9% 13% 10% 1	1762
	21st to end	Day	62% 6% 9% 13% 9% 1	1555
March	1st to 10th	Day	56% 5% 12% 12% 14% 1	4836
	11th to 20th	Day	52% 7% 16% 15% 7% 2	4980
	21st to end	Day	48% 5% 9% 20% 16% 2	5528
April	1st to 10th	Day	53% 5% 9% 20% 11% 2	2400
	11th to 20th	Day	50% 5% 9% 20% 15% 1	2387
	21st to end	Day	52% 6% 9% 18% 12% 3	2600
May	1st to 10th	Day	46% 8% 11% 21% 12% 2	4410
	11th to 20th	Day	46% 10% 13% 19% 12% 1	4542
	21st to end	Day	38% 9% 13% 22% 15% 3	4907
June	1st to 10th	Day	47% 9% 13% 17% 14% 1	2660
	11th to 20th	Day	41% 8% 13% 23% 13% 1	2660
	21st to end	Day	45% 8% 14% 20% 12% 1	2660
July	1st to 10th	Day	39% 7% 16% 24% 14% 1	4370
	11th to 20th	Day	34% 7% 16% 33% 9%	4365
	21st to end	Day	35% 9% 13% 30% 12%	4580
August	1st to 10th	Day	45% 7% 14% 22% 11% 1	4091
	11th to 20th	Day	43% 8% 15% 26% 8%	4083
	21st to end	Day	37% 7% 13% 32% 10% 1	4282
September	1st to 10th	Day	39% 8% 13% 27% 11% 1	2280
	11th to 20th	Day	34% 7% 15% 29% 14% 1	2256
	21st to end	Day	44% 7% 14% 25% 10%	1996
October	1st to 10th	Day	42% 6% 12% 28% 11% 1	3160
	11th to 20th	Day	46% 6% 15% 20% 12% 1	3140
	21st to end	Day	52% 7% 15% 19% 7%	3402
November	1st to 10th	Day	48% 8% 16% 20% 9% 1	1661
	11th to 20th	Day	53% 9% 15% 14% 8% 1	1600
	21st to end	Day	62% 8% 13% 12% 5%	1600
December	1st to 10th	Day	69% 6% 13% 8% 4	2600
	11th to 20th	Day	65% 6% 9% 12% 8%	2986
	21st to end	Day	67% 6% 7% 13% 7%	3960
January	1st to 10th	Night	60% 8% 9% 15% 8%	6349
	11th to 20th	Night	66% 7% 13% 9% 5% 1	6287
	21st to end	Night	62% 6% 10% 9% 12% 1	6490
February	1st to 10th	Night	60% 7% 12% 16% 5% 1	2600
	11th to 20th	Night	58% 6% 10% 17% 8% 1	2535
	21st to end	Night	53% 7% 12% 19% 8% 1	2075
March	1st to 10th	Night	55% 5% 8% 15% 11% 4	5014
	11th to 20th	Night	47% 8% 18% 17% 8% 1	4980
	21st to end	Night	46% 6% 10% 22% 14% 2	5404
April	1st to 10th	Night	52% 6% 9% 19% 12% 2	2000
	11th to 20th	Night	46% 8% 10% 20% 15% 1	1975
	21st to end	Night	48% 8% 10% 17% 15% 2	1804
May	1st to 10th	Night	47% 8% 13% 15% 14% 2	2770
	11th to 20th	Night	42% 11% 13% 21% 11% 2	2576
	21st to end	Night	34% 9% 13% 23% 19% 2	2785
June	1st to 10th	Night	42% 8% 13% 21% 15% 2	1520
	11th to 20th	Night	36% 9% 12% 22% 19% 2	1520
	21st to end	Night	43% 7% 14% 21% 14% 2	1520
July	1st to 10th	Night	35% 7% 16% 24% 17% 1	2480
	11th to 20th	Night	34% 6% 13% 33% 14%	2472
	21st to end	Night	32% 6% 15% 33% 13% 1	2728
August	1st to 10th	Night	36% 6% 15% 26% 16% 1	2814
	11th to 20th	Night	36% 7% 18% 27% 11% 1	2812
	21st to end	Night	33% 7% 12% 34% 12% 1	3341
September	1st to 10th	Night	36% 9% 15% 26% 13% 1	1900
	11th to 20th	Night	30% 7% 14% 32% 16% 1	1920
	21st to end	Night	42% 7% 12% 27% 11% 1	2183
October	1st to 10th	Night	35% 6% 12% 28% 19%	3800
	11th to 20th	Night	45% 7% 14% 26% 9%	3779
	21st to end	Night	49% 6% 14% 23% 8%	4146
November	1st to 10th	Night	48% 7% 14% 21% 10% 1	2634
	11th to 20th	Night	52% 8% 13% 17% 8% 2	2800
	21st to end	Night	57% 10% 14% 15% 4	2800
December	1st to 10th	Night	65% 7% 12% 12% 3	4580
	11th to 20th	Night	65% 6% 11% 11% 6%	5208
	21st to end	Night	70% 6% 8% 10% 7%	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	22% 24% 35% 15% 4 1	200
	11th to 20th	Day	28% 22% 32% 14% 2 1	215
	21st to end	Day	25% 24% 34% 12% 5%	330
February	1st to 10th	Day	34% 22% 31% 10% 3	300
	11th to 20th	Day	33% 25% 36% 6% 1	300
	21st to end	Day	37% 18% 35% 9%	319
March	1st to 10th	Day	25% 22% 35% 14% 3	500
	11th to 20th	Day	27% 22% 32% 16% 2 1	500
	21st to end	Day	33% 18% 30% 12% 6% 1	550
April	1st to 10th	Day	29% 21% 33% 10% 6%	500
	11th to 20th	Day	34% 20% 22% 14% 6% 4	492
	21st to end	Day	30% 18% 33% 12% 6% 1	500
May	1st to 10th	Day	24% 18% 32% 17% 5% 5%	503
	11th to 20th	Day	21% 13% 36% 17% 10% 3	527
	21st to end	Day	19% 14% 33% 20% 10% 4	549
June	1st to 10th	Day	19% 14% 37% 22% 7% 1	490
	11th to 20th	Day	17% 12% 32% 23% 12% 4	490
	21st to end	Day	22% 12% 32% 22% 10% 3	490
July	1st to 10th	Day	11% 8% 34% 31% 13% 4	485
	11th to 20th	Day	13% 11% 30% 25% 15% 6%	484
	21st to end	Day	11% 10% 35% 29% 12% 4	532
August	1st to 10th	Day	14% 9% 30% 27% 14% 6%	486
	11th to 20th	Day	12% 8% 28% 29% 16% 7%	479
	21st to end	Day	12% 10% 32% 27% 12% 7%	539
September	1st to 10th	Day	16% 11% 29% 23% 13% 8%	490
	11th to 20th	Day	11% 10% 28% 21% 18% 13%	490
	21st to end	Day	18% 15% 26% 26% 11% 5%	490
October	1st to 10th	Day	23% 18% 26% 16% 13% 5%	490
	11th to 20th	Day	24% 21% 32% 15% 6% 2	490
	21st to end	Day	32% 21% 25% 17% 4	532
November	1st to 10th	Day	26% 19% 29% 20% 6%	295
	11th to 20th	Day	28% 25% 32% 12% 3 2	200
	21st to end	Day	31% 19% 36% 14% 2	200
December	1st to 10th	Day	29% 25% 29% 15% 3	200
	11th to 20th	Day	35% 23% 25% 15% 2 1	200
	21st to end	Day	34% 18% 35% 10% 3 1	220
January	1st to 10th	Night	27% 23% 30% 15% 5% 1	800
	11th to 20th	Night	28% 17% 32% 19% 5%	800
	21st to end	Night	20% 18% 34% 23% 5% 1	880
February	1st to 10th	Night	22% 22% 35% 18% 2	800
	11th to 20th	Night	24% 18% 38% 17% 3	783
	21st to end	Night	25% 21% 34% 18% 2	660
March	1st to 10th	Night	23% 19% 36% 19% 4	800
	11th to 20th	Night	22% 20% 35% 19% 4 1	800
	21st to end	Night	22% 15% 34% 21% 8%	880
April	1st to 10th	Night	26% 17% 33% 20% 5%	800
	11th to 20th	Night	24% 16% 31% 20% 7% 1	791
	21st to end	Night	23% 11% 31% 25% 9% 1	604
May	1st to 10th	Night	23% 7% 31% 26% 11% 2	505
	11th to 20th	Night	14% 10% 36% 31% 9%	394
	21st to end	Night	13% 9% 31% 34% 12% 1	423
June	1st to 10th	Night	16% 8% 35% 30% 12%	380
	11th to 20th	Night	13% 9% 29% 36% 12% 1	380
	21st to end	Night	13% 9% 29% 35% 13%	380
July	1st to 10th	Night	7% 6% 26% 44% 16%	370
	11th to 20th	Night	9% 4 32% 33% 21% 1	368
	21st to end	Night	10% 4 30% 40% 15% 2	459
August	1st to 10th	Night	12% 4 22% 37% 24% 2	567
	11th to 20th	Night	11% 5% 20% 36% 25% 2	564
	21st to end	Night	12% 6% 29% 32% 20% 2	753
September	1st to 10th	Night	12% 8% 31% 29% 18% 3	760
	11th to 20th	Night	12% 6% 23% 30% 25% 4	760
	21st to end	Night	19% 10% 22% 28% 18% 3	760
October	1st to 10th	Night	19% 12% 29% 23% 15% 2	760
	11th to 20th	Night	26% 15% 30% 20% 8% 1	760
	21st to end	Night	29% 16% 29% 21% 4	836
November	1st to 10th	Night	27% 13% 27% 25% 8% 1	780
	11th to 20th	Night	24% 18% 34% 18% 6% 1	800
	21st to end	Night	30% 15% 30% 20% 5%	800
December	1st to 10th	Night	29% 20% 33% 14% 4	800
	11th to 20th	Night	24% 21% 36% 16% 4	800
	21st to end	Night	34% 16% 31% 16% 3	880

Page generated at 2025-05-23 09:21:03. Version ac07

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