N Crow Rd
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the N Crow Rd clear sky chart from 2005-11-06 to 2026-07-16.

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	4 6% 2 6% 4 4 5% 4 6% 8% 51%	147074
	Night	3 5% 2 5% 4 3 4 3 5% 8% 57%	143151
Transparency	Day	27% 8% 13% 23% 21% 8%	141987
	Night	24% 7% 14% 27% 22% 7%	139248
Seeing	Day	13% 22% 32% 21% 10% 2	18036
	Night	10% 25% 33% 24% 8% 1	28024

By Month

Percentage Cloud Cover SW (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	1 5% 2 8% 4 4 4 3 5% 7% 58%	4720
	11th to 20th	Day	3 1 6% 5% 3 3 3 6% 9% 60%	4740
	21st to end	Day	1 3 2 4 3 4 3 3 5% 8% 63%	5840
February	1st to 10th	Day	1 4 3 7% 6% 5% 4 4 6% 10% 50%	1890
	11th to 20th	Day	1 5% 2 7% 5% 4 4 4 6% 8% 54%	1973
	21st to end	Day	1 6% 3 6% 3 3 3 3 5% 8% 58%	1730
March	1st to 10th	Day	2 9% 4 7% 3 3 3 3 5% 8% 54%	4600
	11th to 20th	Day	2 7% 3 7% 4 4 5% 5% 6% 8% 48%	5058
	21st to end	Day	3 8% 3 6% 5% 5% 5% 5% 7% 10% 45%	5937
April	1st to 10th	Day	5% 8% 2 5% 3 4 4 4 6% 8% 50%	2520
	11th to 20th	Day	7% 12% 4 7% 4 4 4 3 5% 7% 42%	2491
	21st to end	Day	8% 10% 3 7% 5% 5% 5% 4 6% 7% 40%	2520
May	1st to 10th	Day	10% 10% 3 6% 4 4 4 4 5% 6% 46%	7755
	11th to 20th	Day	8% 8% 2 5% 4 5% 5% 5% 6% 8% 43%	8191
	21st to end	Day	6% 7% 2 6% 5% 5% 6% 5% 7% 9% 42%	9026
June	1st to 10th	Day	5% 5% 2 5% 5% 5% 6% 6% 8% 9% 45%	2940
	11th to 20th	Day	7% 5% 1 5% 3 4 5% 4 8% 7% 50%	2940
	21st to end	Day	4 4 1 4 4 5% 6% 5% 7% 9% 51%	2940
July	1st to 10th	Day	4 3 1 5% 4 5% 6% 5% 8% 9% 50%	6479
	11th to 20th	Day	2 3 1 5% 5% 6% 7% 6% 9% 10% 46%	6411
	21st to end	Day	6% 4 2 6% 5% 6% 6% 5% 8% 8% 45%	6903
August	1st to 10th	Day	6% 4 2 5% 4 5% 6% 5% 9% 10% 44%	5787
	11th to 20th	Day	4 3 1 5% 4 5% 5% 4 7% 8% 53%	5478
	21st to end	Day	7% 5% 2 7% 5% 5% 6% 4 6% 7% 46%	5984
September	1st to 10th	Day	5% 4 1 5% 4 4 4 4 5% 7% 57%	2400
	11th to 20th	Day	7% 3 1 5% 3 4 4 3 5% 8% 58%	2390
	21st to end	Day	6% 5% 2 4 3 3 3 2 4 6% 63%	2190
October	1st to 10th	Day	4 4 1 3 2 2 2 2 3 4 72%	3270
	11th to 20th	Day	4 5% 2 5% 3 3 3 3 5% 7% 59%	3250
	21st to end	Day	4 7% 2 4 3 2 3 3 4 6% 61%	3387
November	1st to 10th	Day	3 4 1 4 2 3 3 3 6% 8% 62%	1853
	11th to 20th	Day	2 5% 2 4 3 3 3 3 5% 9% 60%	1890
	21st to end	Day	2 5% 2 6% 5% 4 4 3 6% 7% 55%	1693
December	1st to 10th	Day	1 3 1 2 2 3 3 3 4 6% 71%	2700
	11th to 20th	Day	1 5% 2 4 3 3 4 3 6% 9% 61%	3106
	21st to end	Day	1 5% 3 7% 5% 4 4 3 6% 7% 54%	4092
January	1st to 10th	Night	5% 2 8% 4 4 4 4 6% 8% 56%	8201
	11th to 20th	Night	2 2 6% 4 3 3 3 5% 8% 65%	8250
	21st to end	Night	4 2 6% 4 4 4 3 5% 7% 62%	8430
February	1st to 10th	Night	1 4 2 5% 5% 4 4 4 6% 7% 57%	2730
	11th to 20th	Night	1 6% 2 5% 5% 4 4 3 5% 8% 56%	2533
	21st to end	Night	1 7% 3 6% 3 3 3 2 5% 6% 61%	2076
March	1st to 10th	Night	1 10% 3 6% 3 3 3 3 4 7% 56%	5494
	11th to 20th	Night	2 8% 3 6% 3 3 3 3 4 8% 56%	5157
	21st to end	Night	4 8% 3 7% 4 4 5% 4 7% 8% 47%	5264
April	1st to 10th	Night	4 8% 1 4 4 4 4 3 5% 7% 55%	2100
	11th to 20th	Night	5% 9% 3 6% 4 3 3 3 5% 7% 51%	2077
	21st to end	Night	9% 10% 3 6% 4 3 3 3 4 7% 48%	2100
May	1st to 10th	Night	10% 10% 3 4 4 3 4 4 6% 6% 47%	5172
	11th to 20th	Night	7% 7% 2 6% 4 4 5% 4 6% 8% 47%	4701
	21st to end	Night	8% 8% 2 5% 4 5% 4 4 6% 8% 47%	5181
June	1st to 10th	Night	4 5% 1 4 3 4 4 5% 6% 9% 53%	1680
	11th to 20th	Night	6% 3 1 3 4 3 3 4 5% 8% 60%	1680
	21st to end	Night	5% 4 1 4 3 4 3 3 5% 8% 61%	1680
July	1st to 10th	Night	3 4 2 6% 4 4 5% 3 6% 8% 55%	3720
	11th to 20th	Night	3 3 1 5% 4 4 5% 5% 8% 10% 52%	3680
	21st to end	Night	4 3 1 5% 4 4 5% 5% 7% 8% 52%	3970
August	1st to 10th	Night	6% 4 2 5% 4 4 4 4 6% 9% 52%	4022
	11th to 20th	Night	3 3 1 5% 4 4 5% 5% 7% 9% 56%	4369
	21st to end	Night	6% 5% 2 5% 4 4 4 4 6% 9% 50%	4993
September	1st to 10th	Night	6% 5% 1 4 3 3 3 3 5% 6% 60%	2000
	11th to 20th	Night	5% 4 2 4 3 3 3 3 6% 7% 61%	2010
	21st to end	Night	7% 4 1 4 3 2 3 3 5% 6% 63%	2206
October	1st to 10th	Night	4 3 1 2 2 2 3 2 4 4 73%	3920
	11th to 20th	Night	4 6% 2 4 3 3 4 3 5% 7% 58%	3898
	21st to end	Night	3 5% 2 4 3 3 3 3 4 6% 63%	4379
November	1st to 10th	Night	3 4 2 4 3 2 3 3 6% 8% 64%	2665
	11th to 20th	Night	2 5% 2 3 3 2 3 4 5% 8% 62%	2730
	21st to end	Night	2 5% 2 5% 4 3 4 3 6% 7% 59%	2924
December	1st to 10th	Night	3 2 3 2 2 3 2 4 6% 73%	4710
	11th to 20th	Night	1 4 2 4 2 2 3 2 5% 9% 66%	5321
	21st to end	Night	1 5% 2 6% 4 4 4 4 6% 8% 55%	7128

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	25% 7% 17% 25% 22% 4	4723
	11th to 20th	Day	19% 7% 20% 25% 21% 8%	4740
	21st to end	Day	18% 7% 15% 28% 25% 7%	5840
February	1st to 10th	Day	28% 10% 20% 23% 15% 4	1890
	11th to 20th	Day	27% 9% 15% 27% 18% 5%	1982
	21st to end	Day	23% 6% 17% 26% 21% 7%	1730
March	1st to 10th	Day	27% 6% 11% 23% 25% 8%	4600
	11th to 20th	Day	28% 10% 13% 26% 19% 4	5058
	21st to end	Day	31% 9% 16% 32% 10% 2	5937
April	1st to 10th	Day	30% 8% 15% 25% 17% 6%	2520
	11th to 20th	Day	39% 8% 14% 19% 15% 4	2494
	21st to end	Day	39% 10% 11% 24% 15% 1	2520
May	1st to 10th	Day	37% 7% 12% 25% 17% 3	7755
	11th to 20th	Day	33% 10% 10% 21% 22% 5%	8195
	21st to end	Day	33% 9% 13% 24% 17% 4	9027
June	1st to 10th	Day	30% 11% 16% 20% 18% 5%	2940
	11th to 20th	Day	28% 9% 10% 19% 23% 12%	2940
	21st to end	Day	24% 9% 12% 22% 20% 13%	2940
July	1st to 10th	Day	24% 8% 9% 14% 24% 21%	6411
	11th to 20th	Day	24% 10% 12% 21% 18% 14%	6336
	21st to end	Day	31% 8% 10% 16% 19% 15%	6705
August	1st to 10th	Day	32% 9% 14% 20% 16% 9%	4215
	11th to 20th	Day	28% 8% 12% 15% 24% 14%	3959
	21st to end	Day	27% 6% 12% 16% 26% 13%	4311
September	1st to 10th	Day	24% 6% 8% 19% 28% 14%	2400
	11th to 20th	Day	23% 6% 10% 22% 26% 12%	2390
	21st to end	Day	23% 5% 8% 22% 34% 9%	2190
October	1st to 10th	Day	18% 4 6% 16% 31% 25%	3270
	11th to 20th	Day	24% 5% 11% 33% 20% 7%	3250
	21st to end	Day	24% 5% 9% 32% 26% 5%	3387
November	1st to 10th	Day	19% 8% 14% 26% 28% 5%	1853
	11th to 20th	Day	21% 6% 14% 30% 23% 5%	1890
	21st to end	Day	25% 7% 15% 27% 20% 6%	1693
December	1st to 10th	Day	14% 7% 13% 35% 27% 5%	2700
	11th to 20th	Day	18% 7% 16% 38% 19% 2	3104
	21st to end	Day	27% 7% 16% 25% 18% 7%	4092
January	1st to 10th	Night	25% 6% 15% 30% 18% 6%	8202
	11th to 20th	Night	19% 7% 17% 25% 24% 8%	8250
	21st to end	Night	21% 7% 13% 26% 23% 9%	8430
February	1st to 10th	Night	23% 9% 21% 27% 17% 4	2730
	11th to 20th	Night	26% 9% 16% 27% 19% 4	2534
	21st to end	Night	24% 6% 14% 24% 25% 8%	2076
March	1st to 10th	Night	27% 6% 10% 21% 25% 10%	5494
	11th to 20th	Night	26% 6% 11% 22% 30% 5%	5157
	21st to end	Night	30% 9% 17% 31% 11% 1	5264
April	1st to 10th	Night	28% 8% 14% 26% 19% 5%	2100
	11th to 20th	Night	31% 7% 14% 26% 17% 5%	2077
	21st to end	Night	36% 6% 10% 27% 19% 1	2100
May	1st to 10th	Night	34% 7% 12% 29% 15% 3	5171
	11th to 20th	Night	31% 8% 14% 26% 16% 5%	4702
	21st to end	Night	32% 9% 15% 26% 16% 2	5182
June	1st to 10th	Night	24% 9% 21% 27% 15% 4	1680
	11th to 20th	Night	21% 6% 12% 24% 23% 14%	1680
	21st to end	Night	21% 7% 10% 25% 24% 13%	1680
July	1st to 10th	Night	24% 7% 10% 20% 26% 14%	3680
	11th to 20th	Night	22% 7% 18% 27% 17% 10%	3632
	21st to end	Night	25% 8% 13% 22% 19% 13%	3856
August	1st to 10th	Night	28% 7% 17% 21% 20% 6%	2918
	11th to 20th	Night	26% 7% 17% 21% 18% 11%	3164
	21st to end	Night	21% 6% 16% 20% 26% 11%	3597
September	1st to 10th	Night	24% 6% 8% 22% 26% 15%	2000
	11th to 20th	Night	22% 6% 10% 25% 26% 12%	2010
	21st to end	Night	23% 5% 8% 24% 32% 8%	2206
October	1st to 10th	Night	16% 4 7% 21% 34% 19%	3920
	11th to 20th	Night	24% 6% 10% 28% 25% 6%	3898
	21st to end	Night	21% 5% 10% 31% 26% 7%	4379
November	1st to 10th	Night	19% 8% 14% 26% 27% 6%	2665
	11th to 20th	Night	19% 7% 17% 30% 22% 6%	2730
	21st to end	Night	23% 6% 13% 30% 22% 6%	2924
December	1st to 10th	Night	13% 5% 15% 36% 26% 5%	4710
	11th to 20th	Night	16% 7% 15% 41% 19% 3	5322
	21st to end	Night	24% 8% 15% 28% 20% 5%	7128

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	20% 32% 28% 14% 4 2	330
	11th to 20th	Day	19% 44% 23% 12% 2	330
	21st to end	Day	15% 40% 34% 9% 2 1	363
February	1st to 10th	Day	21% 43% 28% 6% 1	330
	11th to 20th	Day	18% 40% 33% 8% 2	330
	21st to end	Day	25% 35% 30% 10%	273
March	1st to 10th	Day	13% 33% 37% 13% 3	330
	11th to 20th	Day	22% 26% 35% 12% 4	514
	21st to end	Day	17% 30% 37% 12% 3	594
April	1st to 10th	Day	16% 32% 35% 13% 3	540
	11th to 20th	Day	23% 33% 31% 11% 2	532
	21st to end	Day	22% 24% 34% 15% 5% 1	540
May	1st to 10th	Day	20% 23% 30% 18% 8% 1	711
	11th to 20th	Day	19% 17% 32% 21% 9% 2	775
	21st to end	Day	11% 20% 31% 22% 14% 2	844
June	1st to 10th	Day	8% 13% 30% 31% 14% 4	780
	11th to 20th	Day	10% 16% 37% 26% 10% 1	780
	21st to end	Day	6% 13% 37% 28% 14% 2	780
July	1st to 10th	Day	7% 7% 25% 32% 24% 5%	771
	11th to 20th	Day	4 5% 32% 35% 20% 3	744
	21st to end	Day	6% 5% 25% 32% 27% 4	794
August	1st to 10th	Day	9% 8% 36% 27% 16% 3	535
	11th to 20th	Day	8% 6% 32% 33% 16% 4	517
	21st to end	Day	9% 10% 34% 30% 14% 3	583
September	1st to 10th	Day	7% 11% 33% 33% 12% 4	530
	11th to 20th	Day	8% 16% 34% 27% 12% 3	520
	21st to end	Day	9% 15% 32% 24% 14% 6%	330
October	1st to 10th	Day	11% 16% 32% 24% 11% 5%	330
	11th to 20th	Day	15% 26% 34% 17% 7% 1	330
	21st to end	Day	13% 31% 38% 15% 3 1	363
November	1st to 10th	Day	13% 32% 36% 13% 4 2	330
	11th to 20th	Day	18% 35% 33% 12% 2	330
	21st to end	Day	16% 41% 30% 11% 2	330
December	1st to 10th	Day	22% 36% 30% 8% 5%	330
	11th to 20th	Day	24% 46% 24% 6%	330
	21st to end	Day	21% 45% 23% 8% 2 1	363
January	1st to 10th	Night	13% 40% 29% 12% 4 1	1050
	11th to 20th	Night	13% 48% 25% 10% 3 1	1050
	21st to end	Night	9% 40% 35% 12% 4	945
February	1st to 10th	Night	10% 45% 33% 10% 3	840
	11th to 20th	Night	10% 38% 37% 14% 2	824
	21st to end	Night	15% 37% 37% 9% 1	692
March	1st to 10th	Night	7% 31% 41% 17% 4	840
	11th to 20th	Night	12% 25% 37% 21% 5%	840
	21st to end	Night	10% 26% 40% 20% 4 1	772
April	1st to 10th	Night	12% 23% 40% 22% 3	630
	11th to 20th	Night	14% 22% 41% 19% 4	623
	21st to end	Night	16% 18% 34% 25% 7%	630
May	1st to 10th	Night	15% 16% 32% 27% 9% 1	630
	11th to 20th	Night	18% 10% 29% 32% 10% 1	621
	21st to end	Night	9% 13% 34% 28% 15% 1	683
June	1st to 10th	Night	6% 10% 31% 37% 14% 1	630
	11th to 20th	Night	8% 10% 36% 38% 8%	630
	21st to end	Night	5% 9% 32% 37% 15% 2	630
July	1st to 10th	Night	6% 4 24% 42% 22% 2	615
	11th to 20th	Night	4 3 25% 46% 21% 2	597
	21st to end	Night	4 3 20% 44% 27% 2	657
August	1st to 10th	Night	8% 3 23% 46% 18% 1	597
	11th to 20th	Night	4 3 24% 49% 18% 2	594
	21st to end	Night	4 4 27% 39% 24% 1	660
September	1st to 10th	Night	9% 5% 23% 43% 18% 3	600
	11th to 20th	Night	6% 7% 28% 40% 16% 3	600
	21st to end	Night	8% 8% 33% 37% 13% 1	606
October	1st to 10th	Night	9% 17% 31% 29% 11% 3	800
	11th to 20th	Night	10% 21% 37% 25% 8% 1	800
	21st to end	Night	10% 25% 40% 19% 5% 1	958
November	1st to 10th	Night	9% 26% 40% 20% 4 1	1025
	11th to 20th	Night	11% 36% 39% 12% 2	1050
	21st to end	Night	9% 35% 38% 15% 2	1050
December	1st to 10th	Night	14% 38% 32% 13% 2	1050
	11th to 20th	Night	13% 42% 32% 12% 2 1	1050
	21st to end	Night	14% 45% 29% 10% 3	1155

Page generated at 2026-07-13 01:14:49. Version ac07

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