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 2024-01-27.

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% 4 7% 6% 3 5% 5% 6% 8% 35%	74817
	Night	15% 9% 4 7% 6% 3 5% 5% 5% 7% 35%	75187
Transparency	Day	30% 38% 9% 14% 7% 1	74528
	Night	34% 37% 8% 13% 7% 1	74996
Seeing	Day	16% 6% 21% 31% 21% 6%	14174
	Night	19% 7% 25% 31% 15% 3	24019

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% 13% 6% 10% 7% 5% 6% 5% 4 6% 21%	1517
	11th to 20th	Day	17% 14% 7% 11% 8% 5% 6% 4 4 7% 16%	1602
	21st to end	Day	18% 17% 7% 9% 7% 3 5% 5% 5% 6% 20%	1836
February	1st to 10th	Day	17% 13% 6% 9% 8% 4 6% 5% 4 5% 23%	1620
	11th to 20th	Day	15% 10% 6% 11% 9% 5% 5% 5% 5% 5% 24%	1679
	21st to end	Day	17% 13% 3 9% 7% 4 5% 4 6% 6% 27%	1480
March	1st to 10th	Day	17% 10% 5% 7% 6% 4 4 5% 5% 7% 29%	1867
	11th to 20th	Day	14% 13% 4 7% 6% 4 4 3 5% 6% 34%	1980
	21st to end	Day	19% 11% 5% 9% 7% 3 5% 4 4 6% 27%	2178
April	1st to 10th	Day	13% 11% 5% 7% 7% 3 5% 6% 5% 6% 33%	2048
	11th to 20th	Day	16% 8% 3 7% 6% 3 5% 6% 6% 8% 33%	2298
	21st to end	Day	18% 8% 4 6% 5% 4 4 4 5% 7% 35%	2340
May	1st to 10th	Day	15% 8% 3 6% 6% 4 5% 5% 6% 7% 34%	2340
	11th to 20th	Day	17% 8% 3 6% 6% 5% 4 5% 6% 6% 34%	2301
	21st to end	Day	8% 6% 2 6% 5% 4 5% 6% 6% 9% 43%	2531
June	1st to 10th	Day	10% 7% 2 5% 6% 3 5% 5% 6% 10% 41%	2495
	11th to 20th	Day	10% 5% 3 5% 5% 3 5% 6% 6% 9% 42%	2700
	21st to end	Day	9% 4 2 5% 5% 3 5% 6% 8% 11% 40%	2565
July	1st to 10th	Day	8% 5% 2 5% 4 3 5% 5% 7% 8% 48%	2520
	11th to 20th	Day	9% 4 2 4 5% 4 6% 5% 7% 10% 46%	2480
	21st to end	Day	7% 5% 3 4 5% 3 5% 7% 7% 9% 44%	2547
August	1st to 10th	Day	7% 5% 2 5% 5% 4 5% 6% 8% 9% 46%	2327
	11th to 20th	Day	8% 5% 2 6% 6% 4 6% 6% 8% 10% 40%	2303
	21st to end	Day	9% 5% 2 5% 4 3 5% 5% 7% 10% 46%	2574
September	1st to 10th	Day	10% 7% 2 6% 6% 3 5% 5% 6% 8% 42%	2014
	11th to 20th	Day	9% 5% 3 5% 4 3 5% 6% 7% 9% 45%	1980
	21st to end	Day	15% 5% 2 6% 5% 3 5% 4 6% 9% 40%	1980
October	1st to 10th	Day	12% 6% 2 7% 5% 4 5% 5% 5% 7% 44%	1910
	11th to 20th	Day	16% 8% 3 6% 6% 4 5% 5% 5% 8% 34%	1800
	21st to end	Day	19% 9% 3 6% 5% 3 6% 5% 6% 6% 31%	1880
November	1st to 10th	Day	11% 6% 4 7% 5% 4 5% 6% 5% 8% 40%	1672
	11th to 20th	Day	14% 12% 3 7% 5% 2 6% 5% 5% 8% 32%	1710
	21st to end	Day	18% 11% 5% 7% 6% 3 5% 5% 6% 6% 28%	1585
December	1st to 10th	Day	16% 13% 6% 11% 8% 3 5% 6% 5% 6% 20%	1520
	11th to 20th	Day	17% 13% 5% 8% 7% 3 5% 6% 5% 7% 23%	1910
	21st to end	Day	25% 18% 7% 12% 6% 3 4 3 4 7% 11%	2728
January	1st to 10th	Night	18% 13% 5% 8% 7% 3 5% 4 4 5% 27%	2648
	11th to 20th	Night	19% 16% 6% 9% 7% 3 6% 5% 5% 4 21%	2573
	21st to end	Night	15% 16% 7% 9% 7% 4 5% 4 4 5% 24%	2664
February	1st to 10th	Night	18% 14% 6% 9% 9% 4 4 4 4 5% 24%	2340
	11th to 20th	Night	16% 12% 5% 9% 7% 4 5% 5% 5% 6% 26%	2166
	21st to end	Night	19% 12% 5% 8% 6% 3 5% 4 4 5% 30%	1776
March	1st to 10th	Night	16% 8% 4 7% 6% 4 5% 5% 5% 6% 34%	2093
	11th to 20th	Night	13% 8% 3 5% 5% 3 5% 5% 6% 8% 38%	1980
	21st to end	Night	18% 9% 4 7% 5% 4 6% 4 5% 6% 34%	2178
April	1st to 10th	Night	15% 9% 5% 7% 4 4 4 5% 5% 7% 37%	1926
	11th to 20th	Night	16% 7% 4 5% 5% 3 4 5% 7% 8% 35%	1611
	21st to end	Night	18% 7% 3 6% 4 3 4 5% 5% 6% 40%	1620
May	1st to 10th	Night	17% 7% 3 7% 7% 5% 5% 4 6% 7% 32%	1620
	11th to 20th	Night	19% 6% 2 5% 5% 4 4 4 5% 7% 38%	1592
	21st to end	Night	9% 4 3 4 6% 3 4 6% 6% 9% 46%	1744
June	1st to 10th	Night	11% 5% 2 5% 4 3 6% 5% 7% 8% 44%	1455
	11th to 20th	Night	11% 4 2 5% 5% 3 5% 5% 6% 10% 44%	1260
	21st to end	Night	9% 4 2 5% 5% 4 4 6% 6% 8% 47%	1385
July	1st to 10th	Night	7% 5% 2 5% 5% 3 4 4 6% 7% 52%	1440
	11th to 20th	Night	8% 5% 2 4 4 2 3 6% 6% 9% 51%	1478
	21st to end	Night	6% 3 2 4 5% 3 5% 5% 7% 10% 51%	1771
August	1st to 10th	Night	7% 3 2 5% 4 3 5% 5% 6% 9% 50%	1611
	11th to 20th	Night	8% 4 2 5% 4 3 5% 5% 6% 10% 47%	1598
	21st to end	Night	7% 5% 2 4 5% 3 4 5% 6% 7% 51%	1782
September	1st to 10th	Night	9% 5% 2 5% 5% 3 4 5% 6% 7% 47%	1924
	11th to 20th	Night	10% 4 2 4 5% 3 4 4 5% 6% 53%	1980
	21st to end	Night	13% 6% 2 5% 5% 3 5% 4 5% 7% 44%	1980
October	1st to 10th	Night	13% 6% 3 5% 5% 3 4 5% 5% 6% 46%	2049
	11th to 20th	Night	18% 7% 2 6% 6% 3 5% 5% 5% 6% 37%	2160
	21st to end	Night	20% 8% 4 6% 6% 3 5% 4 4 6% 34%	2474
November	1st to 10th	Night	12% 7% 2 6% 5% 3 4 5% 5% 7% 44%	2406
	11th to 20th	Night	16% 9% 4 7% 7% 3 6% 4 5% 7% 33%	2470
	21st to end	Night	21% 12% 4 6% 5% 2 4 4 5% 7% 29%	2590
December	1st to 10th	Night	18% 14% 6% 7% 8% 4 6% 5% 4 6% 22%	2660
	11th to 20th	Night	16% 13% 5% 9% 6% 4 6% 5% 5% 6% 26%	3285
	21st to end	Night	27% 20% 7% 9% 7% 3 4 3 3 5% 13%	4898

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	42% 41% 7% 8% 2	1518
	11th to 20th	Day	44% 41% 8% 5% 1	1602
	21st to end	Day	47% 37% 7% 7% 2	1836
February	1st to 10th	Day	40% 38% 8% 9% 5%	1620
	11th to 20th	Day	40% 38% 8% 9% 4 1	1688
	21st to end	Day	39% 38% 8% 10% 4 1	1480
March	1st to 10th	Day	33% 38% 11% 14% 4	1867
	11th to 20th	Day	34% 38% 8% 12% 7% 2	1980
	21st to end	Day	37% 38% 8% 14% 3	2178
April	1st to 10th	Day	29% 38% 10% 12% 11% 1	2048
	11th to 20th	Day	30% 38% 9% 13% 9% 1	2298
	21st to end	Day	30% 37% 10% 14% 8% 1	2340
May	1st to 10th	Day	29% 39% 8% 15% 8% 1	2340
	11th to 20th	Day	30% 37% 7% 12% 11% 2	2305
	21st to end	Day	22% 40% 11% 17% 9% 1	2531
June	1st to 10th	Day	24% 39% 10% 18% 8% 2	2495
	11th to 20th	Day	20% 39% 12% 16% 11% 2	2700
	21st to end	Day	22% 40% 12% 14% 10% 2	2565
July	1st to 10th	Day	20% 39% 8% 18% 13% 2	2451
	11th to 20th	Day	19% 39% 10% 18% 12% 2	2405
	21st to end	Day	21% 41% 11% 15% 11% 1	2405
August	1st to 10th	Day	22% 39% 11% 20% 7%	2314
	11th to 20th	Day	22% 37% 12% 17% 10% 1	2303
	21st to end	Day	20% 39% 10% 17% 13% 2	2574
September	1st to 10th	Day	24% 39% 11% 14% 11% 1	2014
	11th to 20th	Day	21% 39% 11% 20% 9%	1980
	21st to end	Day	29% 38% 9% 14% 9%	1980
October	1st to 10th	Day	27% 37% 7% 19% 8% 1	1910
	11th to 20th	Day	35% 39% 9% 12% 6%	1800
	21st to end	Day	32% 40% 10% 12% 6% 1	1880
November	1st to 10th	Day	23% 44% 9% 15% 9%	1672
	11th to 20th	Day	33% 40% 8% 12% 6% 1	1710
	21st to end	Day	35% 40% 9% 13% 3	1585
December	1st to 10th	Day	42% 40% 9% 7% 2	1520
	11th to 20th	Day	41% 34% 9% 13% 3	1906
	21st to end	Day	61% 26% 8% 4 1	2728
January	1st to 10th	Night	40% 41% 7% 10% 3	2648
	11th to 20th	Night	43% 40% 8% 7% 2	2573
	21st to end	Night	44% 36% 8% 10% 2	2664
February	1st to 10th	Night	41% 37% 8% 10% 4 1	2340
	11th to 20th	Night	40% 38% 8% 10% 4	2168
	21st to end	Night	38% 36% 8% 12% 5% 1	1776
March	1st to 10th	Night	33% 37% 8% 15% 6%	2093
	11th to 20th	Night	30% 38% 9% 13% 8% 1	1980
	21st to end	Night	34% 36% 7% 15% 6% 1	2178
April	1st to 10th	Night	30% 37% 8% 13% 10% 1	1926
	11th to 20th	Night	29% 36% 7% 14% 12% 2	1611
	21st to end	Night	31% 37% 7% 13% 11% 2	1620
May	1st to 10th	Night	35% 37% 8% 11% 7% 2	1620
	11th to 20th	Night	29% 38% 6% 13% 12% 3	1593
	21st to end	Night	22% 39% 9% 19% 10% 2	1745
June	1st to 10th	Night	25% 38% 8% 16% 11% 2	1455
	11th to 20th	Night	21% 39% 11% 15% 12% 2	1260
	21st to end	Night	23% 38% 8% 17% 14%	1385
July	1st to 10th	Night	23% 38% 7% 17% 14% 1	1400
	11th to 20th	Night	21% 39% 8% 20% 11% 2	1430
	21st to end	Night	17% 40% 13% 15% 13% 2	1672
August	1st to 10th	Night	22% 38% 10% 22% 8% 1	1600
	11th to 20th	Night	20% 37% 9% 21% 11% 3	1598
	21st to end	Night	19% 38% 9% 18% 14% 2	1782
September	1st to 10th	Night	24% 38% 8% 15% 12% 2	1924
	11th to 20th	Night	22% 37% 8% 20% 12% 1	1980
	21st to end	Night	28% 38% 9% 15% 10% 1	1980
October	1st to 10th	Night	25% 37% 8% 14% 14% 1	2049
	11th to 20th	Night	35% 38% 9% 11% 7% 1	2160
	21st to end	Night	35% 38% 7% 14% 6% 1	2474
November	1st to 10th	Night	21% 42% 9% 16% 11%	2406
	11th to 20th	Night	35% 40% 8% 11% 5%	2470
	21st to end	Night	37% 41% 7% 13% 2	2590
December	1st to 10th	Night	45% 40% 6% 8% 2	2660
	11th to 20th	Night	42% 35% 11% 9% 3	3288
	21st to end	Night	62% 26% 8% 4 1	4898

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% 10% 30% 26% 10% 1	270
	11th to 20th	Day	22% 10% 35% 26% 6% 1	270
	21st to end	Day	27% 9% 24% 31% 7% 1	282
February	1st to 10th	Day	25% 8% 34% 30% 3	240
	11th to 20th	Day	22% 9% 34% 28% 8%	240
	21st to end	Day	22% 10% 34% 30% 4	198
March	1st to 10th	Day	23% 8% 25% 35% 10%	307
	11th to 20th	Day	19% 6% 29% 33% 10% 2	420
	21st to end	Day	22% 6% 30% 31% 10% 1	462
April	1st to 10th	Day	14% 8% 25% 40% 13% 1	420
	11th to 20th	Day	21% 8% 26% 28% 12% 5%	412
	21st to end	Day	22% 4 28% 29% 15% 2	420
May	1st to 10th	Day	22% 6% 23% 28% 18% 3	423
	11th to 20th	Day	19% 5% 20% 27% 23% 6%	447
	21st to end	Day	12% 2 16% 29% 31% 11%	485
June	1st to 10th	Day	13% 2 15% 40% 24% 5%	520
	11th to 20th	Day	12% 3 16% 37% 27% 4	630
	21st to end	Day	11% 3 15% 38% 29% 4	630
July	1st to 10th	Day	11% 2 10% 32% 32% 14%	621
	11th to 20th	Day	11% 2 10% 35% 32% 10%	578
	21st to end	Day	9% 2 10% 34% 35% 10%	488
August	1st to 10th	Day	10% 2 8% 33% 32% 16%	446
	11th to 20th	Day	11% 3 9% 29% 37% 11%	439
	21st to end	Day	9% 2 13% 31% 31% 14%	495
September	1st to 10th	Day	11% 4 13% 28% 30% 14%	450
	11th to 20th	Day	10% 3 9% 28% 34% 16%	450
	21st to end	Day	18% 6% 17% 25% 24% 10%	450
October	1st to 10th	Day	12% 3 21% 29% 22% 13%	450
	11th to 20th	Day	17% 10% 29% 28% 13% 2	450
	21st to end	Day	24% 10% 30% 25% 10% 1	395
November	1st to 10th	Day	14% 10% 26% 26% 20% 4	270
	11th to 20th	Day	17% 14% 28% 28% 11% 2	270
	21st to end	Day	21% 10% 38% 28% 4	210
December	1st to 10th	Day	21% 13% 31% 27% 8%	180
	11th to 20th	Day	26% 13% 33% 22% 6% 1	180
	21st to end	Day	25% 12% 34% 24% 5%	276
January	1st to 10th	Night	23% 12% 34% 22% 8% 1	950
	11th to 20th	Night	27% 10% 32% 24% 6%	863
	21st to end	Night	22% 8% 34% 30% 6%	820
February	1st to 10th	Night	26% 5% 34% 31% 4	720
	11th to 20th	Night	22% 8% 32% 32% 5%	703
	21st to end	Night	26% 9% 32% 29% 4	592
March	1st to 10th	Night	20% 7% 30% 33% 9%	720
	11th to 20th	Night	18% 5% 34% 32% 8% 2	720
	21st to end	Night	22% 6% 28% 31% 12% 1	792
April	1st to 10th	Night	18% 8% 32% 35% 8% 1	666
	11th to 20th	Night	19% 4 30% 32% 12% 2	533
	21st to end	Night	21% 4 26% 37% 11% 1	540
May	1st to 10th	Night	21% 4 24% 35% 14% 3	540
	11th to 20th	Night	22% 3 18% 34% 21% 3	531
	21st to end	Night	10% 2 15% 35% 32% 5%	584
June	1st to 10th	Night	11% 3 21% 40% 24% 1	450
	11th to 20th	Night	12% 3 13% 43% 28% 1	360
	21st to end	Night	11% 2 17% 39% 26% 4	485
July	1st to 10th	Night	10% 2 10% 36% 35% 7%	525
	11th to 20th	Night	9% 3 13% 38% 29% 8%	522
	21st to end	Night	6% 2 13% 42% 32% 5%	591
August	1st to 10th	Night	8% 2 9% 42% 31% 7%	537
	11th to 20th	Night	10% 4 10% 35% 33% 8%	534
	21st to end	Night	10% 3 12% 36% 31% 8%	594
September	1st to 10th	Night	11% 4 15% 32% 30% 8%	674
	11th to 20th	Night	12% 2 13% 31% 34% 8%	720
	21st to end	Night	18% 4 17% 31% 24% 6%	720
October	1st to 10th	Night	17% 5% 20% 31% 20% 6%	720
	11th to 20th	Night	21% 11% 29% 25% 13% 2	720
	21st to end	Night	24% 10% 28% 31% 6% 1	792
November	1st to 10th	Night	17% 9% 28% 29% 15% 2	740
	11th to 20th	Night	21% 13% 34% 22% 8% 2	760
	21st to end	Night	27% 11% 31% 22% 8%	760
December	1st to 10th	Night	25% 16% 31% 21% 7%	760
	11th to 20th	Night	23% 12% 37% 24% 5%	760
	21st to end	Night	29% 10% 31% 26% 4	1021

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