Camp Cedarwin Scout Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Cedarwin Scout Camp clear sky chart from 2005-11-06 to 2026-05-17.

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	13% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	131451
	Night	14% 10% 4 8% 5% 5% 5% 4 5% 6% 35%	131419
Transparency	Day	47% 5% 12% 22% 12% 1	135048
	Night	49% 5% 11% 21% 13% 1	135892
Seeing	Day	16% 6% 23% 30% 19% 6%	17259
	Night	19% 7% 26% 31% 15% 2	27059

By Month

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	13% 14% 7% 16% 6% 5% 5% 3 5% 6% 20%	4691
	11th to 20th	Day	12% 16% 7% 15% 10% 7% 6% 3 3 5% 16%	4970
	21st to end	Day	18% 15% 5% 13% 7% 5% 6% 4 5% 5% 17%	5780
February	1st to 10th	Day	15% 13% 5% 11% 6% 5% 6% 4 5% 5% 24%	1890
	11th to 20th	Day	14% 12% 6% 12% 8% 6% 5% 3 5% 6% 24%	1967
	21st to end	Day	15% 13% 3 11% 6% 5% 4 4 6% 6% 27%	1730
March	1st to 10th	Day	15% 12% 5% 10% 5% 4 4 3 4 5% 31%	4763
	11th to 20th	Day	12% 11% 3 9% 6% 5% 4 3 5% 7% 35%	5090
	21st to end	Day	16% 12% 5% 10% 6% 5% 4 3 4 6% 28%	5586
April	1st to 10th	Day	14% 12% 3 8% 6% 4 5% 4 5% 6% 32%	2390
	11th to 20th	Day	16% 8% 3 8% 5% 4 5% 4 6% 7% 33%	2686
	21st to end	Day	17% 8% 3 7% 5% 4 4 3 5% 7% 36%	2730
May	1st to 10th	Day	19% 10% 3 8% 5% 4 4 3 5% 6% 33%	5992
	11th to 20th	Day	16% 8% 2 6% 5% 5% 5% 4 7% 8% 34%	5939
	21st to end	Day	14% 6% 2 7% 4 4 4 4 6% 8% 41%	6433
June	1st to 10th	Day	10% 7% 2 5% 5% 4 4 5% 7% 9% 41%	2773
	11th to 20th	Day	9% 5% 3 6% 5% 5% 5% 5% 7% 9% 41%	3000
	21st to end	Day	9% 5% 2 6% 5% 4 5% 5% 9% 11% 39%	2849
July	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 4 7% 9% 45%	6360
	11th to 20th	Day	7% 4 2 5% 4 5% 6% 4 7% 10% 46%	6250
	21st to end	Day	8% 5% 2 6% 5% 5% 5% 4 6% 9% 44%	6424
August	1st to 10th	Day	11% 6% 2 6% 3 4 5% 4 7% 8% 45%	4234
	11th to 20th	Day	9% 5% 2 7% 5% 5% 7% 5% 8% 11% 37%	4174
	21st to end	Day	8% 5% 2 6% 4 5% 6% 5% 7% 10% 42%	4675
September	1st to 10th	Day	9% 7% 2 7% 5% 4 5% 4 6% 8% 45%	2236
	11th to 20th	Day	8% 5% 2 5% 3 4 5% 5% 7% 9% 47%	2200
	21st to end	Day	16% 6% 2 7% 4 4 5% 3 6% 8% 39%	2200
October	1st to 10th	Day	11% 5% 2 7% 4 5% 4 3 5% 7% 46%	2122
	11th to 20th	Day	15% 8% 2 6% 5% 4 5% 4 6% 8% 36%	2000
	21st to end	Day	18% 9% 3 7% 4 5% 6% 4 6% 7% 32%	2088
November	1st to 10th	Day	12% 7% 3 8% 4 5% 5% 4 6% 7% 40%	1852
	11th to 20th	Day	14% 12% 3 7% 5% 4 6% 4 5% 8% 32%	1890
	21st to end	Day	17% 13% 4 9% 6% 4 4 4 6% 6% 26%	1751
December	1st to 10th	Day	15% 13% 5% 12% 7% 5% 5% 5% 5% 7% 22%	2680
	11th to 20th	Day	20% 18% 5% 9% 6% 4 4 4 5% 6% 19%	3070
	21st to end	Day	26% 18% 6% 13% 5% 4 4 2 4 6% 13%	3986
January	1st to 10th	Night	15% 14% 5% 11% 6% 6% 4 4 5% 5% 25%	8232
	11th to 20th	Night	9% 16% 7% 13% 7% 6% 8% 5% 5% 5% 19%	8001
	21st to end	Night	16% 15% 6% 9% 4 4 4 3 5% 6% 27%	8401
February	1st to 10th	Night	16% 15% 4 10% 7% 5% 5% 3 4 6% 25%	2730
	11th to 20th	Night	15% 13% 5% 10% 6% 5% 5% 4 5% 6% 26%	2537
	21st to end	Night	18% 13% 4 10% 5% 5% 4 4 4 5% 29%	2076
March	1st to 10th	Night	16% 10% 4 8% 4 4 4 4 5% 6% 35%	5310
	11th to 20th	Night	9% 7% 2 7% 5% 5% 5% 4 6% 8% 42%	5090
	21st to end	Night	15% 8% 4 8% 5% 5% 5% 3 5% 6% 37%	5588
April	1st to 10th	Night	16% 11% 4 7% 4 5% 4 3 5% 6% 35%	2247
	11th to 20th	Night	16% 8% 3 7% 5% 4 5% 4 7% 7% 35%	1882
	21st to end	Night	17% 8% 2 6% 4 4 4 4 5% 7% 40%	1890
May	1st to 10th	Night	21% 9% 3 9% 6% 5% 4 3 4 5% 31%	4123
	11th to 20th	Night	16% 7% 3 7% 5% 5% 5% 4 5% 7% 37%	4086
	21st to end	Night	13% 6% 2 6% 4 4 5% 4 5% 8% 44%	4421
June	1st to 10th	Night	11% 5% 2 5% 4 4 5% 4 7% 8% 44%	1616
	11th to 20th	Night	11% 5% 2 6% 4 5% 4 5% 6% 10% 43%	1400
	21st to end	Night	8% 5% 2 6% 4 5% 4 5% 6% 8% 47%	1540
July	1st to 10th	Night	7% 4 2 6% 4 4 4 4 7% 10% 48%	3618
	11th to 20th	Night	9% 5% 2 6% 4 4 4 5% 6% 9% 47%	3720
	21st to end	Night	8% 4 2 6% 4 4 5% 3 6% 8% 50%	4427
August	1st to 10th	Night	12% 5% 2 6% 4 4 4 4 5% 8% 46%	2915
	11th to 20th	Night	8% 5% 2 7% 4 4 5% 3 6% 8% 48%	2875
	21st to end	Night	7% 4 2 6% 5% 5% 5% 4 6% 7% 49%	3223
September	1st to 10th	Night	9% 5% 2 6% 4 4 5% 4 6% 6% 49%	2140
	11th to 20th	Night	9% 4 2 5% 4 4 3 3 5% 5% 57%	2200
	21st to end	Night	14% 6% 2 7% 4 4 4 3 5% 7% 42%	2200
October	1st to 10th	Night	12% 5% 2 5% 4 4 4 4 5% 6% 49%	2277
	11th to 20th	Night	17% 7% 2 7% 5% 4 5% 4 5% 6% 38%	2400
	21st to end	Night	18% 8% 3 7% 6% 4 4 3 4 6% 36%	2750
November	1st to 10th	Night	12% 7% 2 7% 4 5% 4 3 5% 7% 44%	2666
	11th to 20th	Night	16% 10% 3 8% 6% 4 5% 3 5% 7% 33%	2730
	21st to end	Night	20% 13% 4 8% 5% 3 4 4 5% 6% 27%	2864
December	1st to 10th	Night	14% 13% 5% 10% 6% 6% 6% 4 5% 6% 24%	4720
	11th to 20th	Night	17% 16% 6% 11% 5% 5% 5% 3 5% 5% 22%	5345
	21st to end	Night	26% 20% 6% 10% 5% 4 3 2 3 5% 16%	7179

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	64% 5% 10% 14% 6% 1	4692
	11th to 20th	Day	71% 4 6% 8% 11%	4970
	21st to end	Day	67% 5% 9% 13% 6%	5780
February	1st to 10th	Day	61% 6% 9% 16% 8%	1890
	11th to 20th	Day	60% 5% 10% 17% 8% 1	1976
	21st to end	Day	55% 7% 12% 18% 7% 2	1730
March	1st to 10th	Day	55% 5% 12% 19% 8% 1	4763
	11th to 20th	Day	47% 5% 15% 23% 9% 1	5090
	21st to end	Day	54% 5% 12% 18% 10% 1	5586
April	1st to 10th	Day	49% 6% 13% 18% 13% 1	2390
	11th to 20th	Day	47% 5% 12% 22% 13% 2	2686
	21st to end	Day	46% 5% 13% 22% 12% 2	2730
May	1st to 10th	Day	51% 6% 8% 20% 12% 2	6027
	11th to 20th	Day	45% 9% 13% 21% 11% 2	5943
	21st to end	Day	40% 6% 10% 22% 16% 6%	6447
June	1st to 10th	Day	37% 7% 13% 28% 13% 2	2773
	11th to 20th	Day	36% 8% 15% 23% 16% 2	3000
	21st to end	Day	34% 8% 15% 24% 16% 2	2849
July	1st to 10th	Day	35% 4 12% 28% 19% 2	6291
	11th to 20th	Day	33% 3 15% 30% 17% 1	6175
	21st to end	Day	36% 4 15% 22% 20% 2	6240
August	1st to 10th	Day	35% 5% 15% 29% 15% 1	4221
	11th to 20th	Day	38% 7% 12% 34% 9% 1	4213
	21st to end	Day	35% 5% 15% 30% 13% 1	4674
September	1st to 10th	Day	36% 6% 16% 24% 16% 1	2236
	11th to 20th	Day	29% 8% 14% 31% 17% 1	2200
	21st to end	Day	42% 7% 13% 24% 14%	2200
October	1st to 10th	Day	29% 4 13% 31% 21% 1	3460
	11th to 20th	Day	39% 5% 12% 27% 18%	3240
	21st to end	Day	42% 6% 14% 23% 14% 1	3351
November	1st to 10th	Day	43% 7% 12% 24% 13% 1	1852
	11th to 20th	Day	50% 7% 13% 19% 10% 1	1890
	21st to end	Day	58% 6% 12% 18% 6%	1751
December	1st to 10th	Day	62% 5% 16% 13% 5%	2680
	11th to 20th	Day	66% 5% 10% 13% 5%	3066
	21st to end	Day	75% 3 8% 9% 5%	3986
January	1st to 10th	Night	61% 5% 9% 17% 8% 1	8233
	11th to 20th	Night	64% 6% 7% 12% 9% 1	8001
	21st to end	Night	59% 3 11% 17% 10%	8401
February	1st to 10th	Night	60% 5% 10% 16% 6% 1	2730
	11th to 20th	Night	57% 5% 10% 19% 9% 1	2539
	21st to end	Night	57% 5% 11% 18% 9% 1	2076
March	1st to 10th	Night	50% 4 13% 22% 11% 1	5310
	11th to 20th	Night	38% 6% 13% 26% 15% 1	5090
	21st to end	Night	48% 5% 10% 19% 17% 1	5588
April	1st to 10th	Night	51% 6% 9% 19% 13% 2	2247
	11th to 20th	Night	46% 6% 10% 19% 17% 2	1882
	21st to end	Night	44% 4 12% 21% 15% 4	1890
May	1st to 10th	Night	55% 5% 7% 14% 14% 3	4150
	11th to 20th	Night	46% 7% 9% 26% 10% 2	4087
	21st to end	Night	38% 6% 11% 24% 17% 4	4429
June	1st to 10th	Night	36% 7% 11% 26% 18% 3	1616
	11th to 20th	Night	37% 7% 13% 26% 15% 3	1400
	21st to end	Night	34% 6% 12% 25% 22% 1	1540
July	1st to 10th	Night	32% 4 14% 29% 16% 4	3580
	11th to 20th	Night	35% 4 14% 29% 17% 2	3675
	21st to end	Night	33% 4 14% 21% 26% 2	4297
August	1st to 10th	Night	37% 5% 12% 28% 16% 2	2904
	11th to 20th	Night	34% 6% 10% 35% 13% 2	2902
	21st to end	Night	34% 5% 12% 32% 16% 1	3223
September	1st to 10th	Night	34% 7% 12% 27% 17% 3	2140
	11th to 20th	Night	29% 6% 10% 32% 21% 2	2200
	21st to end	Night	42% 6% 12% 22% 17% 1	2200
October	1st to 10th	Night	26% 4 9% 31% 28% 1	3719
	11th to 20th	Night	41% 5% 10% 25% 18% 1	3899
	21st to end	Night	41% 3 10% 30% 15% 1	4437
November	1st to 10th	Night	40% 7% 11% 24% 17% 1	2666
	11th to 20th	Night	51% 6% 11% 20% 11% 1	2730
	21st to end	Night	57% 6% 12% 19% 6%	2864
December	1st to 10th	Night	61% 4 14% 16% 4	4720
	11th to 20th	Night	64% 5% 11% 13% 7% 1	5348
	21st to end	Night	73% 4 9% 9% 5%	7179

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	21% 10% 36% 24% 8% 1	330
	11th to 20th	Day	23% 13% 35% 22% 5% 1	330
	21st to end	Day	26% 12% 25% 30% 7% 1	363
February	1st to 10th	Day	22% 7% 34% 29% 6% 1	330
	11th to 20th	Day	21% 10% 32% 28% 8%	330
	21st to end	Day	19% 12% 37% 27% 5%	273
March	1st to 10th	Day	22% 8% 30% 30% 9%	409
	11th to 20th	Day	20% 9% 30% 31% 8% 2	540
	21st to end	Day	21% 8% 33% 29% 8% 1	594
April	1st to 10th	Day	18% 9% 27% 35% 10% 1	540
	11th to 20th	Day	20% 9% 29% 28% 10% 4	532
	21st to end	Day	19% 6% 28% 30% 14% 2	540
May	1st to 10th	Day	22% 8% 25% 27% 15% 3	543
	11th to 20th	Day	19% 5% 21% 26% 22% 6%	551
	21st to end	Day	13% 3 18% 27% 29% 9%	573
June	1st to 10th	Day	13% 3 18% 39% 23% 4	608
	11th to 20th	Day	11% 4 20% 37% 25% 4	730
	21st to end	Day	12% 3 17% 38% 26% 4	730
July	1st to 10th	Day	12% 2 13% 32% 28% 12%	721
	11th to 20th	Day	11% 3 14% 33% 30% 10%	673
	21st to end	Day	10% 2 10% 35% 34% 9%	576
August	1st to 10th	Day	10% 3 10% 33% 29% 15%	526
	11th to 20th	Day	10% 3 11% 32% 35% 11%	519
	21st to end	Day	9% 2 13% 33% 29% 13%	583
September	1st to 10th	Day	10% 4 14% 27% 29% 15%	530
	11th to 20th	Day	9% 2 8% 28% 36% 17%	530
	21st to end	Day	20% 5% 17% 25% 23% 10%	530
October	1st to 10th	Day	12% 3 21% 29% 23% 11%	530
	11th to 20th	Day	16% 9% 31% 29% 13% 2	530
	21st to end	Day	23% 10% 31% 25% 10% 1	471
November	1st to 10th	Day	16% 11% 29% 25% 17% 3	330
	11th to 20th	Day	19% 15% 28% 27% 9% 2	330
	21st to end	Day	22% 11% 37% 25% 4	256
December	1st to 10th	Day	22% 15% 30% 26% 7%	220
	11th to 20th	Day	27% 15% 33% 20% 5% 1	220
	21st to end	Day	27% 12% 35% 22% 5%	338
January	1st to 10th	Night	23% 12% 35% 22% 7% 1	1050
	11th to 20th	Night	25% 12% 34% 22% 5%	953
	21st to end	Night	21% 9% 35% 29% 6%	924
February	1st to 10th	Night	24% 6% 34% 31% 5%	840
	11th to 20th	Night	21% 9% 33% 32% 5%	823
	21st to end	Night	24% 9% 35% 28% 4	692
March	1st to 10th	Night	21% 8% 31% 31% 9%	840
	11th to 20th	Night	19% 6% 35% 31% 8% 1	840
	21st to end	Night	20% 8% 30% 31% 10% 1	924
April	1st to 10th	Night	20% 9% 31% 33% 7% 1	777
	11th to 20th	Night	19% 6% 31% 32% 11% 2	623
	21st to end	Night	20% 4 26% 37% 12% 1	630
May	1st to 10th	Night	22% 4 24% 34% 13% 2	630
	11th to 20th	Night	21% 5% 19% 33% 20% 3	609
	21st to end	Night	11% 2 16% 36% 30% 4	650
June	1st to 10th	Night	12% 3 21% 39% 23% 1	500
	11th to 20th	Night	13% 3 15% 43% 26% 1	400
	21st to end	Night	11% 3 19% 39% 26% 4	540
July	1st to 10th	Night	9% 2 11% 37% 34% 6%	585
	11th to 20th	Night	10% 3 14% 38% 28% 8%	582
	21st to end	Night	7% 2 13% 42% 32% 5%	657
August	1st to 10th	Night	8% 2 10% 42% 31% 7%	597
	11th to 20th	Night	10% 3 12% 35% 33% 7%	594
	21st to end	Night	9% 3 12% 37% 32% 7%	660
September	1st to 10th	Night	11% 4 16% 30% 31% 9%	750
	11th to 20th	Night	10% 2 12% 31% 37% 8%	800
	21st to end	Night	19% 4 16% 32% 23% 6%	800
October	1st to 10th	Night	16% 5% 21% 31% 21% 6%	800
	11th to 20th	Night	21% 10% 28% 26% 13% 2	800
	21st to end	Night	22% 10% 29% 31% 7%	880
November	1st to 10th	Night	17% 10% 29% 29% 14% 2	820
	11th to 20th	Night	21% 13% 34% 22% 8% 1	840
	21st to end	Night	27% 11% 32% 21% 8%	840
December	1st to 10th	Night	25% 16% 31% 21% 6%	840
	11th to 20th	Night	23% 13% 36% 23% 5%	840
	21st to end	Night	30% 10% 31% 25% 4	1129

Page generated at 2026-05-14 01:59:00. Version ac07

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