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 2025-01-22.

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	14% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	104836
	Night	15% 10% 4 8% 5% 4 5% 4 5% 6% 34%	104474
Transparency	Day	46% 6% 13% 22% 12% 1	108477
	Night	48% 6% 11% 21% 12% 1	108972
Seeing	Day	16% 6% 21% 31% 20% 6%	15502
	Night	19% 7% 25% 31% 15% 3	25320

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	16% 16% 8% 13% 6% 6% 6% 3 4 5% 19%	2607
	11th to 20th	Day	15% 17% 7% 14% 8% 9% 8% 3 3 5% 11%	2745
	21st to end	Day	27% 18% 6% 13% 5% 3 4 3 4 4 13%	3133
February	1st to 10th	Day	16% 14% 5% 11% 6% 6% 6% 3 5% 5% 24%	1710
	11th to 20th	Day	14% 12% 5% 12% 8% 6% 5% 3 5% 6% 24%	1775
	21st to end	Day	16% 13% 2 11% 6% 5% 4 4 6% 6% 27%	1570
March	1st to 10th	Day	18% 13% 5% 9% 5% 4 4 3 4 6% 29%	3243
	11th to 20th	Day	13% 12% 4 9% 6% 5% 4 3 5% 6% 33%	3480
	21st to end	Day	18% 10% 5% 10% 6% 5% 4 3 4 6% 29%	3815
April	1st to 10th	Day	13% 12% 3 8% 6% 3 5% 4 5% 7% 33%	2162
	11th to 20th	Day	17% 8% 3 8% 5% 4 5% 4 6% 7% 33%	2428
	21st to end	Day	18% 8% 3 7% 5% 4 4 3 5% 7% 36%	2470
May	1st to 10th	Day	16% 9% 2 7% 5% 4 4 4 6% 7% 35%	4082
	11th to 20th	Day	16% 8% 2 6% 4 5% 4 4 7% 8% 35%	4081
	21st to end	Day	8% 5% 2 7% 4 5% 5% 4 6% 8% 46%	4476
June	1st to 10th	Day	9% 7% 2 5% 5% 5% 4 5% 7% 10% 41%	2634
	11th to 20th	Day	9% 5% 3 6% 5% 5% 5% 5% 7% 9% 42%	2850
	21st to end	Day	9% 5% 2 6% 5% 4 5% 5% 9% 11% 39%	2707
July	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 4 7% 8% 43%	4440
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 5% 7% 10% 47%	4358
	21st to end	Day	6% 5% 2 6% 6% 5% 6% 5% 7% 9% 43%	4466
August	1st to 10th	Day	11% 6% 2 6% 3 4 5% 4 7% 8% 45%	4104
	11th to 20th	Day	9% 5% 2 7% 5% 5% 7% 5% 8% 10% 36%	4044
	21st to end	Day	8% 5% 2 6% 4 5% 6% 5% 8% 10% 42%	4532
September	1st to 10th	Day	9% 7% 2 7% 5% 4 5% 4 6% 8% 44%	2125
	11th to 20th	Day	8% 5% 2 5% 3 4 5% 5% 7% 9% 46%	2090
	21st to end	Day	16% 6% 2 7% 4 4 5% 3 6% 8% 39%	2090
October	1st to 10th	Day	11% 6% 2 7% 5% 5% 4 3 5% 7% 45%	2016
	11th to 20th	Day	16% 8% 2 7% 5% 4 5% 4 5% 8% 35%	1900
	21st to end	Day	18% 9% 3 7% 4 5% 6% 4 6% 7% 31%	1984
November	1st to 10th	Day	11% 7% 3 8% 4 5% 5% 4 5% 7% 40%	1762
	11th to 20th	Day	14% 12% 3 7% 5% 4 6% 4 5% 8% 32%	1800
	21st to end	Day	18% 13% 4 9% 5% 4 4 4 6% 6% 26%	1668
December	1st to 10th	Day	15% 13% 5% 12% 7% 5% 5% 5% 5% 7% 22%	2600
	11th to 20th	Day	21% 18% 5% 8% 7% 4 4 4 5% 6% 19%	2990
	21st to end	Day	26% 18% 6% 13% 5% 4 4 2 4 6% 13%	3899
January	1st to 10th	Night	16% 16% 6% 9% 6% 5% 4 4 4 5% 26%	4568
	11th to 20th	Night	15% 19% 7% 12% 5% 4 9% 6% 4 4 14%	4436
	21st to end	Night	25% 18% 7% 10% 4 4 4 3 3 4 18%	4546
February	1st to 10th	Night	17% 15% 4 10% 8% 5% 4 3 4 6% 24%	2470
	11th to 20th	Night	15% 13% 4 10% 6% 5% 5% 4 5% 6% 26%	2290
	21st to end	Night	19% 13% 4 9% 5% 5% 4 4 4 5% 29%	1884
March	1st to 10th	Night	17% 11% 4 8% 4 4 4 3 4 5% 34%	3610
	11th to 20th	Night	9% 7% 2 7% 5% 5% 5% 4 6% 8% 42%	3480
	21st to end	Night	15% 8% 3 8% 4 5% 5% 3 5% 6% 37%	3817
April	1st to 10th	Night	15% 10% 4 7% 4 5% 4 4 5% 7% 36%	2033
	11th to 20th	Night	17% 8% 3 6% 4 4 4 4 8% 7% 35%	1701
	21st to end	Night	17% 8% 2 6% 4 4 4 4 5% 6% 39%	1710
May	1st to 10th	Night	18% 8% 3 8% 5% 5% 5% 3 5% 7% 33%	2813
	11th to 20th	Night	15% 6% 2 8% 5% 5% 5% 4 5% 8% 36%	2812
	21st to end	Night	9% 5% 2 5% 4 4 5% 4 5% 8% 48%	3079
June	1st to 10th	Night	11% 6% 2 5% 4 4 5% 4 7% 9% 44%	1535
	11th to 20th	Night	10% 5% 2 6% 4 5% 4 5% 6% 10% 43%	1330
	21st to end	Night	9% 5% 2 6% 4 5% 5% 5% 6% 7% 47%	1463
July	1st to 10th	Night	9% 4 2 5% 3 4 4 3 6% 10% 50%	2530
	11th to 20th	Night	9% 4 1 4 3 3 3 5% 6% 9% 52%	2607
	21st to end	Night	5% 3 2 6% 5% 4 6% 4 8% 10% 47%	3087
August	1st to 10th	Night	12% 6% 2 6% 4 4 4 4 5% 8% 45%	2825
	11th to 20th	Night	8% 5% 2 6% 4 4 5% 3 6% 8% 48%	2785
	21st to end	Night	7% 4 2 6% 5% 5% 5% 4 6% 7% 49%	3124
September	1st to 10th	Night	9% 5% 2 6% 4 4 4 4 6% 6% 49%	2032
	11th to 20th	Night	9% 5% 2 5% 5% 4 3 3 5% 5% 55%	2090
	21st to end	Night	14% 6% 3 7% 4 4 4 3 5% 7% 42%	2090
October	1st to 10th	Night	13% 6% 2 5% 4 4 4 4 5% 6% 48%	2163
	11th to 20th	Night	18% 7% 2 7% 5% 4 5% 4 5% 6% 38%	2280
	21st to end	Night	19% 8% 3 7% 6% 4 5% 3 4 7% 35%	2612
November	1st to 10th	Night	12% 8% 2 7% 4 5% 4 3 5% 7% 44%	2536
	11th to 20th	Night	16% 10% 4 8% 6% 5% 5% 3 5% 6% 33%	2600
	21st to end	Night	20% 13% 4 8% 5% 3 4 4 5% 7% 28%	2727
December	1st to 10th	Night	14% 13% 5% 10% 7% 6% 6% 4 5% 6% 24%	4580
	11th to 20th	Night	17% 16% 6% 11% 5% 5% 5% 3 5% 5% 22%	5205
	21st to end	Night	26% 20% 6% 10% 5% 4 3 2 4 5% 15%	7024

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	66% 8% 8% 11% 5% 1	2608
	11th to 20th	Day	75% 7% 8% 6% 3	2745
	21st to end	Day	73% 7% 8% 7% 4	3133
February	1st to 10th	Day	61% 6% 9% 15% 7% 1	1710
	11th to 20th	Day	60% 5% 10% 17% 7% 1	1784
	21st to end	Day	55% 7% 12% 18% 7% 2	1570
March	1st to 10th	Day	56% 7% 12% 21% 5% 1	3243
	11th to 20th	Day	48% 7% 14% 21% 9% 1	3480
	21st to end	Day	52% 7% 12% 19% 9% 1	3815
April	1st to 10th	Day	47% 6% 13% 19% 13% 1	2162
	11th to 20th	Day	47% 6% 12% 21% 13% 2	2428
	21st to end	Day	46% 5% 13% 21% 12% 2	2470
May	1st to 10th	Day	46% 8% 10% 24% 10% 1	4120
	11th to 20th	Day	44% 11% 14% 21% 9% 1	4085
	21st to end	Day	33% 8% 12% 21% 19% 7%	4489
June	1st to 10th	Day	36% 7% 13% 28% 13% 2	2634
	11th to 20th	Day	35% 9% 15% 23% 17% 2	2850
	21st to end	Day	34% 8% 16% 24% 16% 2	2707
July	1st to 10th	Day	38% 5% 12% 24% 18% 2	4371
	11th to 20th	Day	30% 4 14% 33% 17% 1	4283
	21st to end	Day	35% 6% 17% 18% 20% 3	4324
August	1st to 10th	Day	36% 5% 15% 29% 14% 1	4091
	11th to 20th	Day	38% 7% 12% 33% 9% 1	4083
	21st to end	Day	36% 6% 15% 29% 13% 1	4531
September	1st to 10th	Day	36% 7% 17% 23% 16% 1	2125
	11th to 20th	Day	30% 8% 14% 30% 17% 1	2090
	21st to end	Day	42% 7% 13% 24% 13%	2090
October	1st to 10th	Day	30% 4 14% 30% 21% 1	3354
	11th to 20th	Day	39% 5% 12% 26% 18%	3140
	21st to end	Day	43% 6% 14% 23% 14% 1	3247
November	1st to 10th	Day	42% 8% 12% 24% 13% 1	1762
	11th to 20th	Day	51% 7% 13% 19% 10% 1	1800
	21st to end	Day	57% 6% 12% 18% 6%	1668
December	1st to 10th	Day	62% 5% 16% 13% 4	2600
	11th to 20th	Day	66% 5% 10% 13% 5%	2986
	21st to end	Day	75% 3 8% 9% 5%	3899
January	1st to 10th	Night	60% 7% 10% 16% 7% 1	4568
	11th to 20th	Night	69% 11% 8% 8% 4	4436
	21st to end	Night	71% 5% 9% 11% 4	4546
February	1st to 10th	Night	61% 6% 11% 15% 6% 1	2470
	11th to 20th	Night	57% 5% 9% 19% 9% 1	2292
	21st to end	Night	56% 5% 10% 18% 8% 1	1884
March	1st to 10th	Night	51% 5% 12% 23% 8%	3610
	11th to 20th	Night	37% 9% 15% 20% 18% 1	3480
	21st to end	Night	47% 6% 11% 22% 13% 1	3817
April	1st to 10th	Night	48% 6% 10% 20% 13% 2	2033
	11th to 20th	Night	45% 6% 10% 20% 17% 2	1701
	21st to end	Night	45% 4 11% 20% 15% 4	1710
May	1st to 10th	Night	49% 7% 8% 19% 14% 3	2840
	11th to 20th	Night	44% 10% 9% 24% 11% 2	2813
	21st to end	Night	31% 8% 11% 24% 20% 6%	3087
June	1st to 10th	Night	36% 7% 11% 26% 16% 3	1535
	11th to 20th	Night	37% 7% 13% 25% 15% 3	1330
	21st to end	Night	35% 6% 12% 25% 22%	1463
July	1st to 10th	Night	30% 4 12% 31% 17% 5%	2490
	11th to 20th	Night	30% 5% 13% 32% 19% 2	2559
	21st to end	Night	32% 6% 18% 21% 22% 2	2988
August	1st to 10th	Night	38% 5% 11% 28% 16% 2	2814
	11th to 20th	Night	34% 7% 10% 35% 13% 2	2812
	21st to end	Night	34% 5% 12% 31% 16% 1	3124
September	1st to 10th	Night	34% 8% 12% 25% 18% 3	2032
	11th to 20th	Night	31% 6% 10% 30% 22% 2	2090
	21st to end	Night	42% 6% 12% 23% 16% 1	2090
October	1st to 10th	Night	27% 4 9% 31% 28% 1	3605
	11th to 20th	Night	41% 5% 11% 25% 18% 1	3779
	21st to end	Night	41% 3 10% 30% 15% 1	4299
November	1st to 10th	Night	40% 7% 12% 24% 16% 1	2536
	11th to 20th	Night	52% 6% 11% 19% 11% 1	2600
	21st to end	Night	57% 6% 12% 19% 6%	2727
December	1st to 10th	Night	61% 4 15% 16% 4	4580
	11th to 20th	Night	64% 5% 11% 12% 6% 1	5208
	21st to end	Night	73% 4 9% 9% 5%	7024

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% 33% 25% 9% 1	300
	11th to 20th	Day	22% 11% 36% 24% 6% 1	300
	21st to end	Day	27% 9% 23% 32% 7% 1	300
February	1st to 10th	Day	22% 8% 33% 31% 6% 1	270
	11th to 20th	Day	20% 9% 33% 30% 8%	270
	21st to end	Day	20% 12% 32% 31% 5%	225
March	1st to 10th	Day	22% 8% 25% 34% 11%	341
	11th to 20th	Day	19% 7% 29% 34% 10% 2	460
	21st to end	Day	22% 6% 31% 31% 9% 1	506
April	1st to 10th	Day	14% 7% 27% 40% 12% 1	460
	11th to 20th	Day	21% 8% 26% 29% 11% 5%	452
	21st to end	Day	20% 5% 27% 30% 15% 2	460
May	1st to 10th	Day	21% 7% 23% 29% 17% 3	463
	11th to 20th	Day	18% 5% 19% 28% 24% 7%	487
	21st to end	Day	11% 3 16% 28% 32% 10%	529
June	1st to 10th	Day	13% 3 16% 39% 24% 5%	564
	11th to 20th	Day	11% 4 18% 38% 26% 4	680
	21st to end	Day	12% 4 17% 36% 27% 4	680
July	1st to 10th	Day	12% 2 12% 32% 30% 13%	671
	11th to 20th	Day	11% 3 12% 34% 31% 10%	625
	21st to end	Day	10% 2 10% 35% 34% 10%	532
August	1st to 10th	Day	10% 3 9% 32% 30% 15%	486
	11th to 20th	Day	10% 3 10% 30% 35% 11%	479
	21st to end	Day	9% 2 12% 33% 30% 14%	539
September	1st to 10th	Day	11% 4 14% 28% 30% 14%	490
	11th to 20th	Day	9% 3 8% 29% 35% 16%	490
	21st to end	Day	21% 5% 17% 24% 23% 10%	490
October	1st to 10th	Day	12% 3 22% 30% 22% 12%	490
	11th to 20th	Day	17% 9% 29% 29% 14% 2	490
	21st to end	Day	22% 10% 30% 25% 11% 1	433
November	1st to 10th	Day	14% 10% 29% 26% 18% 3	300
	11th to 20th	Day	20% 14% 28% 27% 10% 2	300
	21st to end	Day	21% 10% 37% 27% 4	233
December	1st to 10th	Day	21% 15% 30% 27% 8%	200
	11th to 20th	Day	28% 14% 32% 22% 5% 1	200
	21st to end	Day	26% 11% 34% 23% 6%	307
January	1st to 10th	Night	23% 12% 35% 22% 8% 1	1000
	11th to 20th	Night	26% 10% 34% 23% 6%	908
	21st to end	Night	22% 8% 34% 30% 6%	841
February	1st to 10th	Night	25% 5% 33% 31% 5%	760
	11th to 20th	Night	21% 8% 32% 33% 5%	743
	21st to end	Night	25% 9% 32% 29% 4	628
March	1st to 10th	Night	21% 7% 30% 33% 9%	760
	11th to 20th	Night	18% 5% 35% 32% 8% 1	760
	21st to end	Night	21% 6% 28% 32% 11% 1	836
April	1st to 10th	Night	18% 8% 31% 35% 7% 1	703
	11th to 20th	Night	19% 5% 30% 32% 12% 2	563
	21st to end	Night	20% 4 26% 38% 11% 1	570
May	1st to 10th	Night	20% 4 24% 35% 14% 2	570
	11th to 20th	Night	21% 4 17% 34% 21% 3	561
	21st to end	Night	10% 2 16% 36% 31% 5%	617
June	1st to 10th	Night	12% 3 20% 39% 24% 1	475
	11th to 20th	Night	12% 3 14% 43% 27% 1	380
	21st to end	Night	11% 3 19% 38% 25% 4	513
July	1st to 10th	Night	10% 2 11% 36% 34% 7%	555
	11th to 20th	Night	9% 3 14% 38% 28% 8%	552
	21st to end	Night	6% 2 13% 42% 32% 5%	624
August	1st to 10th	Night	8% 2 10% 42% 30% 7%	567
	11th to 20th	Night	10% 3 12% 35% 33% 7%	564
	21st to end	Night	10% 3 12% 36% 32% 8%	627
September	1st to 10th	Night	11% 4 16% 31% 30% 8%	712
	11th to 20th	Night	11% 2 13% 32% 34% 8%	760
	21st to end	Night	19% 4 17% 31% 23% 6%	760
October	1st to 10th	Night	16% 5% 21% 31% 20% 6%	760
	11th to 20th	Night	21% 11% 28% 25% 14% 2	760
	21st to end	Night	23% 10% 28% 31% 7%	836
November	1st to 10th	Night	17% 10% 29% 29% 14% 2	780
	11th to 20th	Night	21% 13% 34% 22% 8% 2	800
	21st to end	Night	27% 11% 32% 22% 8%	800
December	1st to 10th	Night	25% 16% 31% 21% 7%	800
	11th to 20th	Night	24% 12% 36% 24% 5%	800
	21st to end	Night	30% 10% 31% 25% 4	1075

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