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 2024-03-18.

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% 4 7% 6% 3 5% 5% 5% 6% 32%	78560
	Night	16% 10% 4 8% 6% 3 5% 5% 5% 6% 32%	81221
Transparency	Day	50% 8% 12% 18% 10% 1	78268
	Night	51% 8% 12% 18% 10% 1	81047
Seeing	Day	22% 16% 31% 19% 8% 3	13513
	Night	21% 14% 31% 24% 9% 1	22968

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	17% 17% 6% 9% 6% 3 4 3 4 5% 27%	2517
	11th to 20th	Day	11% 17% 8% 14% 8% 5% 6% 4 4 4 19%	2561
	21st to end	Day	20% 19% 7% 11% 7% 4 4 3 3 4 19%	3124
February	1st to 10th	Day	15% 14% 6% 11% 9% 4 6% 5% 4 4 23%	1710
	11th to 20th	Day	13% 14% 7% 12% 7% 4 4 4 3 4 28%	1663
	21st to end	Day	17% 14% 5% 9% 9% 4 5% 4 3 6% 24%	1479
March	1st to 10th	Day	16% 11% 5% 7% 8% 4 4 5% 4 6% 30%	2039
	11th to 20th	Day	13% 14% 5% 9% 6% 4 4 5% 5% 6% 30%	2058
	21st to end	Day	19% 11% 3 5% 5% 3 5% 3 5% 5% 37%	2200
April	1st to 10th	Day	21% 11% 3 7% 5% 3 4 4 5% 6% 31%	2160
	11th to 20th	Day	22% 8% 3 4 6% 2 4 3 4 5% 38%	2145
	21st to end	Day	22% 10% 2 6% 6% 3 5% 4 4 6% 33%	2340
May	1st to 10th	Day	19% 7% 3 6% 6% 3 5% 4 5% 6% 34%	2425
	11th to 20th	Day	16% 7% 3 6% 5% 3 5% 4 5% 7% 40%	2478
	21st to end	Day	13% 6% 2 5% 6% 3 5% 5% 6% 8% 41%	2725
June	1st to 10th	Day	18% 7% 3 6% 5% 3 6% 5% 5% 8% 34%	2520
	11th to 20th	Day	15% 5% 3 5% 5% 3 6% 5% 6% 8% 38%	2520
	21st to end	Day	15% 7% 3 6% 5% 3 5% 5% 6% 7% 37%	2520
July	1st to 10th	Day	11% 5% 2 5% 5% 3 6% 5% 7% 9% 43%	2520
	11th to 20th	Day	11% 6% 2 5% 6% 3 6% 6% 6% 9% 39%	2520
	21st to end	Day	10% 6% 2 5% 7% 4 6% 6% 7% 9% 36%	2700
August	1st to 10th	Day	11% 5% 3 6% 6% 4 5% 5% 6% 9% 39%	2327
	11th to 20th	Day	11% 5% 3 7% 6% 4 5% 6% 6% 8% 38%	2303
	21st to end	Day	13% 6% 3 5% 5% 3 5% 6% 7% 9% 38%	2436
September	1st to 10th	Day	14% 6% 2 6% 5% 3 5% 5% 5% 8% 41%	2160
	11th to 20th	Day	12% 5% 2 5% 5% 2 6% 5% 6% 6% 46%	2138
	21st to end	Day	16% 7% 3 6% 5% 3 3 5% 5% 7% 39%	1891
October	1st to 10th	Day	18% 10% 4 7% 5% 3 4 4 6% 7% 33%	1800
	11th to 20th	Day	24% 9% 3 7% 7% 4 5% 5% 6% 6% 26%	1800
	21st to end	Day	27% 11% 4 7% 6% 3 4 4 4 6% 24%	1967
November	1st to 10th	Day	17% 9% 3 7% 6% 4 4 5% 5% 7% 33%	1576
	11th to 20th	Day	16% 12% 4 7% 6% 4 4 5% 6% 7% 28%	1520
	21st to end	Day	22% 15% 5% 8% 6% 3 5% 4 6% 6% 22%	1520
December	1st to 10th	Day	18% 18% 7% 10% 7% 4 5% 5% 4 5% 19%	1520
	11th to 20th	Day	19% 14% 6% 8% 6% 3 4 5% 4 4 27%	1906
	21st to end	Day	28% 17% 6% 9% 5% 3 4 3 4 4 18%	2772
January	1st to 10th	Night	18% 18% 6% 10% 7% 4 5% 4 4 5% 19%	4429
	11th to 20th	Night	14% 13% 7% 13% 10% 5% 6% 5% 4 5% 20%	4395
	21st to end	Night	19% 15% 7% 10% 6% 4 4 4 4 6% 21%	4532
February	1st to 10th	Night	13% 15% 6% 10% 7% 4 7% 6% 5% 6% 22%	2470
	11th to 20th	Night	13% 13% 6% 10% 7% 3 5% 5% 4 5% 28%	2403
	21st to end	Night	17% 11% 4 8% 7% 4 5% 5% 5% 7% 29%	1975
March	1st to 10th	Night	15% 11% 5% 8% 6% 3 5% 4 4 6% 33%	2125
	11th to 20th	Night	15% 12% 5% 8% 5% 4 3 4 4 5% 34%	2067
	21st to end	Night	16% 8% 3 7% 6% 3 4 4 4 6% 39%	2156
April	1st to 10th	Night	18% 10% 5% 7% 5% 3 5% 4 5% 6% 33%	1800
	11th to 20th	Night	17% 8% 4 6% 5% 3 4 5% 4 7% 37%	1775
	21st to end	Night	18% 8% 3 6% 7% 4 5% 5% 6% 7% 33%	1624
May	1st to 10th	Night	18% 6% 3 7% 4 2 5% 5% 6% 6% 37%	1535
	11th to 20th	Night	12% 6% 3 4 5% 3 4 5% 7% 6% 45%	1415
	21st to end	Night	10% 6% 2 5% 4 3 4 4 5% 8% 50%	1550
June	1st to 10th	Night	15% 5% 3 5% 5% 4 4 6% 6% 9% 39%	1440
	11th to 20th	Night	12% 5% 2 5% 5% 3 5% 5% 5% 8% 45%	1440
	21st to end	Night	12% 6% 3 6% 6% 3 6% 5% 4 7% 40%	1440
July	1st to 10th	Night	7% 4 2 6% 5% 3 5% 5% 5% 7% 52%	1440
	11th to 20th	Night	10% 5% 2 5% 5% 3 4 5% 6% 8% 47%	1440
	21st to end	Night	9% 4 3 3 5% 3 5% 5% 6% 9% 48%	1614
August	1st to 10th	Night	9% 5% 2 5% 5% 2 4 5% 6% 9% 48%	1611
	11th to 20th	Night	9% 5% 3 4 5% 3 4 4 6% 10% 46%	1598
	21st to end	Night	9% 5% 3 6% 5% 3 5% 5% 5% 7% 45%	1901
September	1st to 10th	Night	11% 6% 3 5% 6% 3 4 5% 6% 9% 43%	1800
	11th to 20th	Night	13% 3 1 4 4 3 4 4 5% 7% 52%	1818
	21st to end	Night	16% 6% 3 5% 5% 3 4 4 4 6% 43%	2068
October	1st to 10th	Night	17% 7% 3 7% 5% 4 4 4 5% 7% 37%	2160
	11th to 20th	Night	22% 10% 3 7% 6% 3 4 5% 5% 6% 30%	2160
	21st to end	Night	24% 11% 4 6% 7% 4 4 4 5% 6% 26%	2389
November	1st to 10th	Night	19% 9% 3 6% 5% 3 4 4 5% 6% 36%	2499
	11th to 20th	Night	18% 11% 4 7% 5% 4 5% 5% 5% 7% 29%	2660
	21st to end	Night	21% 10% 5% 8% 6% 4 6% 5% 5% 7% 23%	2660
December	1st to 10th	Night	20% 14% 6% 9% 7% 3 6% 4 6% 6% 18%	2660
	11th to 20th	Night	17% 16% 5% 10% 6% 4 4 4 5% 6% 23%	3288
	21st to end	Night	29% 17% 5% 10% 6% 3 4 4 3 4 14%	4884

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	57% 9% 14% 12% 7% 1	2518
	11th to 20th	Day	67% 8% 10% 8% 6% 1	2561
	21st to end	Day	70% 6% 8% 10% 5% 1	3124
February	1st to 10th	Day	63% 7% 11% 15% 4 1	1710
	11th to 20th	Day	60% 5% 10% 14% 10% 1	1672
	21st to end	Day	61% 6% 9% 13% 9% 1	1479
March	1st to 10th	Day	55% 7% 13% 14% 9% 2	2042
	11th to 20th	Day	54% 6% 11% 16% 11% 2	2058
	21st to end	Day	50% 6% 8% 18% 14% 4	2200
April	1st to 10th	Day	54% 5% 9% 20% 10% 2	2160
	11th to 20th	Day	48% 5% 10% 21% 15% 1	2145
	21st to end	Day	52% 6% 9% 18% 12% 3	2340
May	1st to 10th	Day	49% 6% 9% 18% 15% 3	2425
	11th to 20th	Day	44% 6% 10% 23% 16% 1	2482
	21st to end	Day	40% 9% 15% 20% 14% 2	2725
June	1st to 10th	Day	46% 8% 13% 18% 14% 1	2520
	11th to 20th	Day	41% 8% 13% 23% 14% 1	2520
	21st to end	Day	44% 8% 15% 20% 12% 1	2520
July	1st to 10th	Day	35% 8% 14% 26% 16% 1	2450
	11th to 20th	Day	38% 9% 17% 26% 9% 1	2445
	21st to end	Day	40% 11% 14% 24% 10% 1	2549
August	1st to 10th	Day	39% 10% 15% 23% 11% 1	2314
	11th to 20th	Day	39% 11% 16% 23% 11% 1	2303
	21st to end	Day	39% 9% 15% 25% 11% 1	2436
September	1st to 10th	Day	40% 9% 13% 27% 11% 1	2160
	11th to 20th	Day	35% 8% 15% 28% 14% 1	2138
	21st to end	Day	44% 8% 14% 26% 8%	1891
October	1st to 10th	Day	50% 8% 13% 18% 11% 1	1800
	11th to 20th	Day	56% 8% 15% 15% 5% 1	1800
	21st to end	Day	60% 8% 11% 14% 7%	1967
November	1st to 10th	Day	48% 8% 16% 19% 9% 1	1576
	11th to 20th	Day	53% 9% 15% 14% 8% 1	1520
	21st to end	Day	62% 9% 13% 11% 5%	1520
December	1st to 10th	Day	67% 8% 11% 10% 4	1520
	11th to 20th	Day	61% 9% 11% 11% 9%	1906
	21st to end	Day	69% 6% 9% 12% 4	2772
January	1st to 10th	Night	63% 10% 11% 11% 4	4429
	11th to 20th	Night	63% 9% 13% 10% 4 1	4395
	21st to end	Night	64% 8% 11% 11% 6%	4532
February	1st to 10th	Night	60% 7% 12% 16% 5% 1	2470
	11th to 20th	Night	57% 6% 11% 18% 8%	2405
	21st to end	Night	53% 7% 12% 19% 8% 1	1975
March	1st to 10th	Night	51% 6% 12% 18% 11% 2	2135
	11th to 20th	Night	51% 6% 11% 19% 11% 1	2068
	21st to end	Night	46% 6% 8% 21% 15% 3	2156
April	1st to 10th	Night	51% 6% 9% 20% 13% 2	1800
	11th to 20th	Night	45% 7% 10% 20% 16% 2	1775
	21st to end	Night	48% 8% 10% 16% 15% 2	1624
May	1st to 10th	Night	45% 7% 12% 18% 15% 3	1535
	11th to 20th	Night	38% 6% 11% 25% 17% 3	1416
	21st to end	Night	32% 9% 14% 23% 18% 4	1551
June	1st to 10th	Night	42% 7% 13% 21% 15% 1	1440
	11th to 20th	Night	36% 8% 11% 22% 20% 2	1440
	21st to end	Night	42% 7% 14% 21% 14% 2	1440
July	1st to 10th	Night	29% 8% 13% 27% 20% 2	1400
	11th to 20th	Night	32% 9% 13% 30% 16%	1392
	21st to end	Night	31% 8% 17% 31% 13% 1	1524
August	1st to 10th	Night	33% 8% 19% 27% 13% 1	1600
	11th to 20th	Night	33% 10% 16% 26% 14% 1	1598
	21st to end	Night	35% 10% 12% 28% 14% 1	1901
September	1st to 10th	Night	36% 9% 16% 24% 13% 1	1800
	11th to 20th	Night	31% 7% 14% 31% 15% 1	1818
	21st to end	Night	41% 7% 13% 28% 11% 1	2068
October	1st to 10th	Night	45% 9% 13% 19% 13% 1	2160
	11th to 20th	Night	53% 8% 13% 19% 7%	2160
	21st to end	Night	59% 7% 10% 13% 10%	2389
November	1st to 10th	Night	47% 7% 14% 21% 10% 1	2499
	11th to 20th	Night	53% 8% 14% 16% 8% 2	2660
	21st to end	Night	57% 11% 14% 14% 4	2660
December	1st to 10th	Night	64% 9% 11% 12% 4	2660
	11th to 20th	Night	62% 7% 12% 14% 6%	3288
	21st to end	Night	72% 7% 8% 9% 3	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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	23% 24% 33% 16% 4 1	180
	11th to 20th	Day	30% 21% 33% 13% 2 1	193
	21st to end	Day	26% 21% 34% 13% 5%	297
February	1st to 10th	Day	33% 22% 33% 10% 3	270
	11th to 20th	Day	29% 25% 39% 6% 1	270
	21st to end	Day	37% 20% 33% 10%	291
March	1st to 10th	Day	24% 22% 35% 15% 3	460
	11th to 20th	Day	27% 20% 34% 17% 2 1	449
	21st to end	Day	32% 18% 29% 14% 6% 1	462
April	1st to 10th	Day	26% 21% 34% 11% 7%	420
	11th to 20th	Day	31% 19% 22% 16% 8% 4	412
	21st to end	Day	30% 17% 33% 12% 6% 1	420
May	1st to 10th	Day	25% 17% 31% 17% 5% 5%	423
	11th to 20th	Day	22% 13% 36% 17% 9% 3	447
	21st to end	Day	17% 14% 34% 20% 11% 4	485
June	1st to 10th	Day	18% 14% 37% 23% 6% 1	450
	11th to 20th	Day	18% 12% 30% 24% 12% 4	450
	21st to end	Day	20% 11% 33% 23% 10% 3	450
July	1st to 10th	Day	10% 8% 33% 31% 14% 4	445
	11th to 20th	Day	13% 10% 30% 25% 16% 6%	444
	21st to end	Day	11% 9% 37% 29% 11% 4	488
August	1st to 10th	Day	11% 8% 30% 29% 14% 7%	446
	11th to 20th	Day	11% 7% 28% 30% 16% 8%	439
	21st to end	Day	12% 11% 32% 26% 12% 8%	495
September	1st to 10th	Day	15% 11% 30% 24% 12% 8%	450
	11th to 20th	Day	12% 11% 30% 21% 17% 10%	450
	21st to end	Day	17% 15% 27% 25% 11% 6%	450
October	1st to 10th	Day	23% 17% 25% 17% 13% 5%	450
	11th to 20th	Day	25% 21% 33% 15% 6% 1	450
	21st to end	Day	33% 21% 24% 18% 4	489
November	1st to 10th	Day	26% 18% 29% 20% 7%	270
	11th to 20th	Day	29% 23% 32% 12% 3 2	180
	21st to end	Day	29% 19% 37% 13% 2	180
December	1st to 10th	Day	28% 25% 29% 15% 3	180
	11th to 20th	Day	34% 23% 24% 16% 1 1	180
	21st to end	Day	35% 20% 35% 9% 2	198
January	1st to 10th	Night	27% 22% 29% 16% 6% 1	760
	11th to 20th	Night	28% 17% 31% 19% 5%	760
	21st to end	Night	20% 18% 33% 24% 5% 1	836
February	1st to 10th	Night	22% 22% 36% 18% 2	760
	11th to 20th	Night	22% 18% 39% 18% 3	743
	21st to end	Night	25% 21% 33% 18% 3	628
March	1st to 10th	Night	22% 19% 35% 20% 4	760
	11th to 20th	Night	22% 19% 34% 20% 4 1	752
	21st to end	Night	21% 14% 35% 22% 9% 1	792
April	1st to 10th	Night	25% 16% 34% 20% 5%	720
	11th to 20th	Night	23% 15% 31% 22% 8% 1	711
	21st to end	Night	23% 12% 29% 27% 9% 1	544
May	1st to 10th	Night	23% 7% 30% 27% 11% 2	455
	11th to 20th	Night	14% 9% 37% 31% 9%	354
	21st to end	Night	12% 9% 32% 34% 13% 1	389
June	1st to 10th	Night	16% 8% 36% 29% 12%	360
	11th to 20th	Night	13% 9% 29% 36% 13% 1	360
	21st to end	Night	12% 9% 28% 36% 14%	360
July	1st to 10th	Night	7% 7% 26% 44% 17%	350
	11th to 20th	Night	9% 3 33% 32% 21% 1	348
	21st to end	Night	10% 4 30% 40% 15% 1	434
August	1st to 10th	Night	12% 4 21% 37% 24% 2	537
	11th to 20th	Night	10% 5% 20% 37% 26% 2	534
	21st to end	Night	11% 6% 29% 32% 20% 2	713
September	1st to 10th	Night	12% 7% 31% 29% 18% 3	720
	11th to 20th	Night	13% 6% 24% 31% 22% 4	720
	21st to end	Night	19% 10% 22% 28% 18% 3	720
October	1st to 10th	Night	20% 12% 29% 23% 15% 2	720
	11th to 20th	Night	27% 15% 30% 20% 8% 1	720
	21st to end	Night	30% 16% 29% 22% 4	792
November	1st to 10th	Night	26% 12% 28% 25% 9% 1	740
	11th to 20th	Night	24% 17% 34% 18% 6% 1	760
	21st to end	Night	29% 14% 30% 21% 5%	760
December	1st to 10th	Night	29% 21% 33% 14% 4	760
	11th to 20th	Night	24% 21% 35% 16% 4	760
	21st to end	Night	34% 16% 31% 15% 2	836

Page generated at 2024-03-15 14:01:45. Version ac07

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