Cold Creek Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cold Creek Conservation Area clear sky chart from 2005-11-06 to 2026-09-14.

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% 10% 3 9% 6% 5% 5% 4 6% 7% 32%	150051
	Night	14% 10% 4 9% 6% 5% 5% 4 5% 6% 32%	140955
Transparency	Day	49% 6% 12% 21% 11% 1	153647
	Night	49% 6% 12% 20% 12% 1	145449
Seeing	Day	21% 15% 31% 21% 9% 3	17124
	Night	20% 12% 32% 26% 10% 1	26108

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	16% 12% 4 14% 7% 6% 5% 5% 6% 6% 18%	4661
	11th to 20th	Day	10% 21% 7% 17% 10% 8% 5% 3 4 4 10%	5108
	21st to end	Day	13% 15% 6% 16% 8% 6% 5% 4 5% 6% 15%	5780
February	1st to 10th	Day	14% 16% 5% 13% 7% 7% 6% 3 4 4 20%	1890
	11th to 20th	Day	12% 14% 7% 15% 8% 5% 5% 4 5% 5% 20%	1843
	21st to end	Day	16% 17% 5% 11% 5% 4 6% 3 4 5% 23%	1614
March	1st to 10th	Day	17% 11% 5% 10% 6% 4 4 3 4 5% 30%	5042
	11th to 20th	Day	11% 14% 4 10% 5% 6% 5% 4 5% 7% 30%	5090
	21st to end	Day	17% 13% 4 9% 5% 4 4 3 4 5% 32%	5586
April	1st to 10th	Day	16% 15% 4 9% 6% 4 4 3 5% 6% 28%	2470
	11th to 20th	Day	19% 11% 3 7% 4 4 4 3 4 6% 35%	2594
	21st to end	Day	20% 9% 3 8% 5% 4 4 3 5% 6% 33%	2730
May	1st to 10th	Day	18% 8% 3 8% 5% 5% 4 4 5% 7% 33%	7642
	11th to 20th	Day	14% 8% 3 9% 5% 5% 5% 4 5% 8% 35%	8155
	21st to end	Day	17% 5% 2 5% 4 4 4 3 5% 7% 43%	9060
June	1st to 10th	Day	14% 7% 3 6% 5% 4 5% 5% 6% 9% 37%	2940
	11th to 20th	Day	11% 5% 2 6% 5% 4 5% 4 7% 10% 39%	2982
	21st to end	Day	14% 5% 2 6% 5% 5% 5% 4 7% 8% 38%	3150
July	1st to 10th	Day	10% 6% 2 7% 5% 6% 6% 4 7% 10% 37%	8603
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 4 7% 11% 47%	8280
	21st to end	Day	8% 5% 2 6% 5% 5% 6% 4 7% 8% 43%	8386
August	1st to 10th	Day	16% 8% 3 7% 5% 4 5% 4 6% 7% 36%	6014
	11th to 20th	Day	9% 6% 2 8% 5% 6% 6% 5% 8% 9% 35%	5951
	21st to end	Day	12% 6% 3 8% 5% 6% 6% 4 6% 9% 36%	6366
September	1st to 10th	Day	12% 6% 2 6% 5% 6% 6% 4 6% 8% 40%	2520
	11th to 20th	Day	11% 5% 2 7% 5% 4 4 4 5% 8% 45%	2303
	21st to end	Day	15% 6% 3 8% 7% 5% 5% 3 7% 7% 34%	2169
October	1st to 10th	Day	18% 9% 2 7% 5% 5% 4 3 4 7% 35%	2000
	11th to 20th	Day	20% 10% 3 9% 5% 5% 4 3 5% 6% 29%	2000
	21st to end	Day	25% 13% 4 9% 5% 5% 5% 4 5% 5% 22%	2200
November	1st to 10th	Day	14% 12% 4 7% 5% 5% 6% 4 6% 7% 29%	1768
	11th to 20th	Day	13% 15% 4 9% 6% 7% 5% 4 6% 8% 24%	1680
	21st to end	Day	16% 16% 7% 11% 7% 6% 5% 4 5% 6% 17%	1680
December	1st to 10th	Day	19% 19% 6% 13% 7% 6% 5% 3 4 5% 14%	2680
	11th to 20th	Day	18% 21% 5% 11% 5% 4 5% 3 5% 4 19%	3066
	21st to end	Day	24% 18% 6% 16% 6% 4 4 3 4 4 11%	4048
January	1st to 10th	Night	13% 13% 5% 12% 7% 7% 6% 5% 6% 6% 20%	8234
	11th to 20th	Night	11% 18% 7% 15% 12% 8% 6% 4 4 4 12%	7759
	21st to end	Night	12% 13% 5% 12% 9% 7% 6% 4 6% 6% 20%	8401
February	1st to 10th	Night	12% 16% 5% 10% 7% 6% 5% 4 5% 6% 25%	2730
	11th to 20th	Night	13% 14% 5% 10% 8% 6% 5% 4 4 6% 25%	2663
	21st to end	Night	11% 14% 4 11% 6% 6% 5% 5% 6% 5% 26%	2185
March	1st to 10th	Night	14% 11% 4 10% 6% 5% 5% 4 5% 5% 29%	5018
	11th to 20th	Night	9% 10% 3 8% 5% 5% 6% 5% 7% 8% 34%	5089
	21st to end	Night	19% 9% 3 7% 5% 4 5% 3 5% 5% 37%	5588
April	1st to 10th	Night	18% 11% 3 9% 5% 5% 4 4 5% 6% 30%	2148
	11th to 20th	Night	15% 10% 3 6% 4 4 4 4 5% 6% 37%	1993
	21st to end	Night	14% 10% 3 6% 5% 4 5% 5% 5% 7% 37%	1890
May	1st to 10th	Night	18% 8% 2 7% 4 4 4 4 5% 7% 37%	5257
	11th to 20th	Night	14% 8% 3 7% 4 4 4 4 5% 7% 40%	4703
	21st to end	Night	17% 5% 2 5% 3 3 3 3 5% 7% 47%	5114
June	1st to 10th	Night	12% 6% 2 5% 6% 5% 5% 4 5% 9% 43%	1680
	11th to 20th	Night	8% 4 2 7% 4 4 5% 5% 6% 10% 43%	1627
	21st to end	Night	11% 5% 2 6% 4 4 4 3 6% 7% 46%	1470
July	1st to 10th	Night	6% 5% 2 7% 5% 4 4 4 6% 9% 47%	4338
	11th to 20th	Night	8% 4 1 6% 4 4 4 4 6% 8% 52%	4680
	21st to end	Night	8% 4 2 6% 4 5% 4 4 6% 7% 50%	5674
August	1st to 10th	Night	12% 8% 2 6% 5% 4 4 3 4 6% 44%	4135
	11th to 20th	Night	9% 5% 2 7% 4 4 4 3 5% 8% 49%	4095
	21st to end	Night	11% 7% 2 6% 4 5% 4 4 5% 9% 42%	4712
September	1st to 10th	Night	8% 5% 2 6% 4 4 5% 4 7% 7% 48%	2100
	11th to 20th	Night	10% 5% 1 4 3 3 4 3 5% 7% 54%	2161
	21st to end	Night	16% 7% 2 7% 5% 4 4 3 5% 6% 41%	2230
October	1st to 10th	Night	16% 7% 2 6% 4 5% 5% 4 5% 6% 40%	2400
	11th to 20th	Night	17% 9% 3 8% 5% 5% 4 4 5% 6% 35%	2400
	21st to end	Night	19% 10% 3 8% 6% 5% 5% 3 6% 6% 28%	2640
November	1st to 10th	Night	15% 9% 3 8% 5% 5% 4 3 5% 7% 36%	2743
	11th to 20th	Night	15% 13% 4 8% 6% 5% 5% 4 6% 6% 28%	2940
	21st to end	Night	18% 14% 4 10% 6% 5% 5% 4 5% 7% 22%	2940
December	1st to 10th	Night	17% 17% 5% 11% 6% 6% 6% 4 6% 6% 15%	4720
	11th to 20th	Night	14% 20% 6% 11% 6% 5% 5% 4 4 6% 19%	5348
	21st to end	Night	23% 18% 6% 14% 6% 5% 4 3 4 4 13%	7150

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	62% 6% 11% 13% 9%	4662
	11th to 20th	Day	76% 4 7% 8% 4	5142
	21st to end	Day	68% 4 9% 10% 8%	5780
February	1st to 10th	Day	63% 9% 8% 15% 5% 1	1890
	11th to 20th	Day	61% 8% 11% 13% 6% 1	1852
	21st to end	Day	61% 7% 10% 14% 7% 1	1614
March	1st to 10th	Day	55% 6% 13% 13% 13% 1	5045
	11th to 20th	Day	50% 7% 15% 19% 7% 2	5090
	21st to end	Day	53% 6% 9% 18% 13% 2	5586
April	1st to 10th	Day	55% 6% 10% 17% 10% 1	2470
	11th to 20th	Day	50% 6% 10% 21% 13% 1	2594
	21st to end	Day	50% 7% 12% 18% 11% 2	2730
May	1st to 10th	Day	49% 5% 13% 18% 11% 4	7651
	11th to 20th	Day	46% 7% 12% 19% 16% 1	8159
	21st to end	Day	40% 5% 9% 27% 16% 2	9061
June	1st to 10th	Day	41% 8% 12% 21% 16% 1	2940
	11th to 20th	Day	37% 8% 15% 23% 15% 1	2982
	21st to end	Day	40% 8% 14% 24% 13% 1	3150
July	1st to 10th	Day	43% 3 15% 25% 13% 1	8534
	11th to 20th	Day	30% 3 12% 38% 16% 1	8205
	21st to end	Day	37% 4 14% 29% 15%	8201
August	1st to 10th	Day	47% 5% 13% 17% 14% 3	6001
	11th to 20th	Day	41% 5% 17% 28% 8%	5990
	21st to end	Day	44% 4 14% 30% 8%	6366
September	1st to 10th	Day	40% 8% 15% 26% 10% 1	2520
	11th to 20th	Day	34% 8% 15% 30% 13%	2303
	21st to end	Day	46% 9% 13% 24% 8%	2169
October	1st to 10th	Day	42% 5% 12% 27% 14% 1	3260
	11th to 20th	Day	41% 5% 14% 25% 15%	3240
	21st to end	Day	56% 5% 12% 19% 7%	3538
November	1st to 10th	Day	50% 9% 13% 19% 8% 1	1768
	11th to 20th	Day	55% 9% 14% 14% 8%	1680
	21st to end	Day	63% 9% 14% 12% 3	1680
December	1st to 10th	Day	70% 6% 13% 8% 3	2680
	11th to 20th	Day	65% 8% 11% 8% 7%	3066
	21st to end	Day	75% 6% 6% 7% 6%	4048
January	1st to 10th	Night	59% 6% 12% 18% 5%	8234
	11th to 20th	Night	71% 8% 7% 10% 5% 1	7800
	21st to end	Night	61% 7% 10% 10% 12% 1	8401
February	1st to 10th	Night	56% 8% 12% 18% 6% 1	2730
	11th to 20th	Night	57% 8% 11% 16% 8%	2665
	21st to end	Night	54% 7% 14% 17% 8%	2185
March	1st to 10th	Night	53% 6% 12% 16% 11% 2	5028
	11th to 20th	Night	41% 7% 19% 22% 9% 2	5090
	21st to end	Night	47% 5% 10% 20% 16% 2	5588
April	1st to 10th	Night	53% 6% 11% 17% 12% 2	2148
	11th to 20th	Night	46% 7% 10% 21% 15% 2	1993
	21st to end	Night	44% 7% 13% 19% 15% 2	1890
May	1st to 10th	Night	47% 5% 11% 17% 15% 5%	5264
	11th to 20th	Night	44% 7% 11% 22% 14% 2	4704
	21st to end	Night	38% 5% 12% 26% 17% 2	5115
June	1st to 10th	Night	36% 7% 12% 23% 19% 2	1680
	11th to 20th	Night	35% 7% 13% 24% 20% 2	1627
	21st to end	Night	36% 7% 13% 26% 17% 1	1470
July	1st to 10th	Night	33% 3 17% 28% 17% 2	4299
	11th to 20th	Night	30% 3 11% 35% 21% 1	4632
	21st to end	Night	32% 4 12% 30% 20% 1	5545
August	1st to 10th	Night	42% 3 12% 24% 15% 4	4124
	11th to 20th	Night	34% 4 16% 35% 11% 1	4122
	21st to end	Night	38% 3 16% 31% 11% 1	4712
September	1st to 10th	Night	33% 8% 15% 30% 13% 1	2100
	11th to 20th	Night	28% 7% 12% 34% 18% 1	2161
	21st to end	Night	42% 8% 12% 26% 11% 1	2230
October	1st to 10th	Night	33% 5% 8% 28% 24% 1	3920
	11th to 20th	Night	41% 5% 14% 26% 13%	3899
	21st to end	Night	42% 6% 16% 25% 11% 1	4252
November	1st to 10th	Night	45% 7% 15% 21% 11% 1	2743
	11th to 20th	Night	51% 9% 14% 16% 9% 1	2940
	21st to end	Night	58% 9% 16% 13% 3	2940
December	1st to 10th	Night	66% 5% 14% 11% 3	4720
	11th to 20th	Night	64% 7% 10% 11% 8%	5348
	21st to end	Night	71% 8% 8% 8% 5%	7150

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% 23% 32% 18% 3	220
	11th to 20th	Day	27% 27% 30% 12% 4	305
	21st to end	Day	27% 25% 31% 15% 2	363
February	1st to 10th	Day	31% 25% 31% 11% 3	330
	11th to 20th	Day	26% 29% 36% 8% 1	330
	21st to end	Day	37% 24% 29% 9%	278
March	1st to 10th	Day	24% 21% 34% 16% 5%	540
	11th to 20th	Day	28% 20% 35% 14% 4	540
	21st to end	Day	31% 19% 30% 13% 5% 1	594
April	1st to 10th	Day	26% 21% 34% 14% 5%	540
	11th to 20th	Day	31% 21% 27% 13% 6% 2	532
	21st to end	Day	26% 17% 36% 13% 6% 1	540
May	1st to 10th	Day	25% 14% 32% 18% 8% 3	543
	11th to 20th	Day	17% 16% 32% 22% 11% 3	567
	21st to end	Day	18% 13% 29% 25% 10% 4	617
June	1st to 10th	Day	13% 17% 34% 26% 9% 2	570
	11th to 20th	Day	17% 13% 32% 26% 11% 2	612
	21st to end	Day	17% 9% 36% 27% 8% 3	780
July	1st to 10th	Day	11% 8% 31% 31% 16% 4	681
	11th to 20th	Day	11% 8% 30% 30% 14% 7%	564
	21st to end	Day	10% 7% 33% 31% 12% 6%	620
August	1st to 10th	Day	13% 7% 26% 29% 16% 8%	566
	11th to 20th	Day	10% 6% 30% 27% 19% 8%	559
	21st to end	Day	14% 7% 30% 26% 17% 6%	627
September	1st to 10th	Day	15% 8% 28% 28% 13% 9%	570
	11th to 20th	Day	9% 8% 24% 25% 21% 13%	542
	21st to end	Day	16% 10% 30% 23% 15% 5%	530
October	1st to 10th	Day	20% 15% 26% 22% 14% 4	530
	11th to 20th	Day	21% 20% 35% 17% 6% 2	530
	21st to end	Day	30% 19% 29% 18% 3	583
November	1st to 10th	Day	26% 22% 28% 17% 6% 1	299
	11th to 20th	Day	27% 23% 32% 13% 5%	220
	21st to end	Day	27% 21% 40% 10% 1	220
December	1st to 10th	Day	31% 21% 31% 15% 2	220
	11th to 20th	Day	30% 25% 29% 15% 1	220
	21st to end	Day	33% 24% 31% 10% 2	242
January	1st to 10th	Night	23% 21% 35% 17% 4	840
	11th to 20th	Night	26% 19% 32% 19% 3	840
	21st to end	Night	20% 14% 38% 22% 6%	924
February	1st to 10th	Night	20% 20% 40% 20% 2	840
	11th to 20th	Night	22% 18% 38% 18% 3	823
	21st to end	Night	22% 20% 38% 18% 3	692
March	1st to 10th	Night	21% 19% 36% 21% 3	840
	11th to 20th	Night	23% 19% 33% 20% 5%	840
	21st to end	Night	23% 15% 35% 21% 6%	924
April	1st to 10th	Night	26% 14% 36% 21% 3	840
	11th to 20th	Night	19% 15% 36% 21% 8% 1	749
	21st to end	Night	20% 11% 33% 28% 7%	630
May	1st to 10th	Night	19% 7% 30% 31% 11% 2	630
	11th to 20th	Night	18% 7% 33% 32% 10% 1	440
	21st to end	Night	12% 8% 30% 35% 14%	455
June	1st to 10th	Night	13% 7% 33% 35% 11%	420
	11th to 20th	Night	11% 9% 30% 36% 14%	420
	21st to end	Night	12% 5% 29% 39% 14%	420
July	1st to 10th	Night	7% 3 25% 45% 20% 1	410
	11th to 20th	Night	10% 3 28% 38% 19% 2	408
	21st to end	Night	8% 4 26% 42% 19% 2	666
August	1st to 10th	Night	11% 1 19% 41% 26% 1	627
	11th to 20th	Night	8% 4 20% 42% 24% 3	624
	21st to end	Night	13% 3 26% 33% 23% 2	769
September	1st to 10th	Night	11% 7% 27% 33% 19% 4	840
	11th to 20th	Night	13% 4 23% 30% 26% 5%	813
	21st to end	Night	20% 7% 22% 31% 17% 4	800
October	1st to 10th	Night	19% 8% 29% 26% 16% 2	800
	11th to 20th	Night	21% 13% 33% 23% 8% 1	800
	21st to end	Night	25% 14% 33% 25% 4	880
November	1st to 10th	Night	23% 13% 32% 23% 8%	820
	11th to 20th	Night	22% 19% 31% 21% 6% 1	840
	21st to end	Night	26% 15% 33% 21% 4	840
December	1st to 10th	Night	28% 17% 35% 16% 3	840
	11th to 20th	Night	23% 19% 39% 17% 2	840
	21st to end	Night	33% 15% 33% 17% 2	924

Page generated at 2026-09-11 04:11:52. Version ac07

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