Quadeville Road
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Quadeville Road clear sky chart from 2005-11-06 to 2024-01-14.

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	17% 11% 4 8% 6% 3 5% 4 5% 6% 31%	74714
	Night	16% 12% 5% 8% 6% 3 4 4 5% 6% 31%	75035
Transparency	Day	54% 5% 10% 19% 10% 1	74419
	Night	54% 5% 11% 19% 10% 1	74864
Seeing	Day	23% 18% 31% 18% 7% 2	13284
	Night	22% 16% 31% 22% 8% 1	22597

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	14% 17% 7% 15% 9% 3 5% 4 4 4 19%	1517
	11th to 20th	Day	19% 15% 6% 11% 9% 4 5% 3 3 5% 22%	1464
	21st to end	Day	12% 13% 7% 13% 10% 6% 5% 4 3 5% 22%	1729
February	1st to 10th	Day	13% 16% 6% 13% 12% 4 5% 5% 5% 5% 19%	1620
	11th to 20th	Day	12% 15% 7% 10% 8% 3 5% 4 5% 5% 26%	1573
	21st to end	Day	17% 16% 6% 7% 7% 4 6% 5% 4 5% 22%	1420
March	1st to 10th	Day	13% 14% 6% 10% 8% 4 5% 4 3 5% 27%	1876
	11th to 20th	Day	13% 14% 6% 10% 9% 4 4 4 4 6% 26%	1980
	21st to end	Day	17% 12% 5% 7% 5% 2 3 3 4 5% 36%	2236
April	1st to 10th	Day	20% 14% 4 8% 6% 3 5% 3 4 5% 29%	2160
	11th to 20th	Day	21% 11% 3 5% 4 3 3 3 3 4 37%	2134
	21st to end	Day	22% 12% 3 7% 5% 2 4 3 4 5% 33%	2322
May	1st to 10th	Day	19% 9% 3 7% 4 3 4 4 4 6% 35%	2494
	11th to 20th	Day	18% 8% 4 6% 6% 3 4 4 5% 7% 36%	2478
	21st to end	Day	14% 7% 3 7% 6% 3 6% 4 6% 7% 38%	2725
June	1st to 10th	Day	22% 8% 3 6% 6% 3 5% 5% 5% 7% 31%	2520
	11th to 20th	Day	17% 6% 3 5% 5% 3 5% 5% 6% 8% 37%	2520
	21st to end	Day	17% 8% 3 6% 5% 3 5% 5% 6% 8% 33%	2520
July	1st to 10th	Day	12% 6% 3 6% 6% 4 5% 6% 6% 8% 38%	2520
	11th to 20th	Day	12% 6% 3 6% 6% 3 6% 5% 7% 9% 37%	2520
	21st to end	Day	13% 6% 2 6% 6% 4 5% 6% 6% 10% 36%	2744
August	1st to 10th	Day	13% 7% 3 6% 8% 4 6% 5% 6% 8% 35%	2377
	11th to 20th	Day	14% 6% 3 6% 8% 4 5% 5% 7% 8% 36%	2303
	21st to end	Day	15% 6% 3 5% 6% 4 6% 5% 6% 9% 35%	2413
September	1st to 10th	Day	16% 7% 3 4 5% 4 5% 5% 5% 7% 39%	2160
	11th to 20th	Day	14% 8% 2 5% 5% 3 4 4 5% 7% 43%	2160
	21st to end	Day	19% 7% 3 6% 6% 3 4 5% 5% 5% 36%	1891
October	1st to 10th	Day	22% 10% 3 5% 6% 3 3 5% 5% 6% 33%	1800
	11th to 20th	Day	23% 13% 4 7% 6% 4 4 4 4 6% 25%	1800
	21st to end	Day	26% 13% 4 7% 6% 3 5% 4 4 5% 21%	1904
November	1st to 10th	Day	14% 12% 4 7% 6% 4 5% 4 4 6% 34%	1596
	11th to 20th	Day	16% 14% 7% 9% 8% 3 5% 4 5% 5% 25%	1520
	21st to end	Day	20% 17% 7% 10% 7% 3 6% 4 4 5% 18%	1520
December	1st to 10th	Day	20% 20% 8% 11% 8% 3 5% 4 3 4 14%	1520
	11th to 20th	Day	17% 17% 6% 10% 7% 3 4 4 4 5% 22%	1906
	21st to end	Day	23% 20% 7% 13% 8% 2 3 2 3 3 17%	2772
January	1st to 10th	Night	16% 15% 8% 13% 9% 4 6% 4 5% 5% 16%	2649
	11th to 20th	Night	15% 16% 7% 11% 9% 5% 5% 5% 4 5% 19%	2569
	21st to end	Night	11% 14% 6% 11% 10% 4 5% 4 4 5% 25%	2624
February	1st to 10th	Night	12% 17% 7% 10% 9% 5% 6% 5% 4 6% 20%	2340
	11th to 20th	Night	13% 13% 6% 9% 7% 3 5% 5% 4 6% 28%	2273
	21st to end	Night	13% 15% 6% 9% 7% 4 4 4 5% 6% 27%	1834
March	1st to 10th	Night	14% 12% 5% 9% 8% 4 4 4 4 4 31%	2070
	11th to 20th	Night	13% 13% 6% 8% 7% 3 4 4 4 7% 31%	1979
	21st to end	Night	13% 10% 4 7% 7% 3 3 5% 5% 5% 38%	2120
April	1st to 10th	Night	20% 11% 5% 8% 5% 3 3 4 4 5% 32%	1800
	11th to 20th	Night	18% 10% 4 5% 5% 3 4 3 4 6% 37%	1775
	21st to end	Night	20% 11% 4 6% 5% 4 4 4 5% 5% 32%	1652
May	1st to 10th	Night	20% 9% 2 5% 4 3 4 5% 4 6% 37%	1463
	11th to 20th	Night	17% 7% 3 5% 5% 4 4 4 5% 8% 41%	1415
	21st to end	Night	12% 6% 2 5% 5% 2 4 5% 7% 9% 44%	1550
June	1st to 10th	Night	16% 7% 3 6% 5% 3 5% 6% 6% 8% 35%	1440
	11th to 20th	Night	14% 5% 3 5% 4 3 5% 5% 4 7% 43%	1440
	21st to end	Night	17% 6% 2 7% 4 3 5% 6% 5% 8% 37%	1440
July	1st to 10th	Night	9% 5% 2 4 6% 3 6% 5% 5% 8% 46%	1440
	11th to 20th	Night	11% 5% 3 6% 6% 3 4 4 5% 8% 44%	1440
	21st to end	Night	9% 6% 2 5% 5% 4 4 5% 6% 9% 46%	1574
August	1st to 10th	Night	10% 5% 2 6% 5% 3 5% 5% 7% 8% 44%	1558
	11th to 20th	Night	9% 6% 3 4 6% 4 4 5% 6% 8% 46%	1598
	21st to end	Night	12% 6% 2 5% 5% 3 4 4 6% 8% 45%	1924
September	1st to 10th	Night	12% 6% 2 4 5% 3 5% 5% 5% 7% 46%	1800
	11th to 20th	Night	15% 5% 2 4 4 3 4 4 4 6% 49%	1800
	21st to end	Night	16% 8% 3 5% 5% 3 4 4 5% 5% 41%	2066
October	1st to 10th	Night	19% 9% 4 5% 4 3 4 4 4 7% 37%	2160
	11th to 20th	Night	21% 13% 3 7% 7% 4 4 4 4 5% 29%	2160
	21st to end	Night	22% 15% 4 7% 6% 4 4 5% 4 6% 24%	2452
November	1st to 10th	Night	16% 13% 4 7% 7% 3 4 4 5% 6% 32%	2478
	11th to 20th	Night	17% 13% 6% 9% 7% 4 6% 4 4 5% 26%	2660
	21st to end	Night	19% 16% 6% 10% 7% 3 4 4 5% 5% 21%	2660
December	1st to 10th	Night	19% 19% 7% 11% 8% 3 5% 4 4 5% 16%	2660
	11th to 20th	Night	17% 19% 7% 11% 7% 3 3 3 3 4 23%	3288
	21st to end	Night	26% 19% 6% 13% 8% 3 3 3 3 4 14%	4884

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	67% 5% 9% 12% 6%	1518
	11th to 20th	Day	67% 5% 6% 10% 10% 2	1464
	21st to end	Day	64% 5% 7% 12% 10% 2	1729
February	1st to 10th	Day	67% 5% 7% 14% 6% 1	1620
	11th to 20th	Day	60% 4 11% 15% 9% 1	1582
	21st to end	Day	63% 5% 8% 12% 10% 1	1420
March	1st to 10th	Day	60% 4 9% 15% 10% 2	1879
	11th to 20th	Day	59% 4 9% 16% 9% 2	1980
	21st to end	Day	51% 3 8% 19% 14% 6%	2236
April	1st to 10th	Day	58% 4 6% 18% 12% 3	2160
	11th to 20th	Day	52% 4 6% 22% 15% 2	2134
	21st to end	Day	54% 4 7% 17% 15% 3	2322
May	1st to 10th	Day	50% 5% 9% 19% 14% 4	2494
	11th to 20th	Day	49% 4 8% 21% 15% 3	2482
	21st to end	Day	45% 5% 13% 20% 13% 3	2725
June	1st to 10th	Day	53% 5% 10% 19% 12% 1	2520
	11th to 20th	Day	45% 6% 10% 23% 14% 3	2520
	21st to end	Day	47% 7% 11% 21% 12% 1	2520
July	1st to 10th	Day	41% 7% 11% 27% 14% 1	2450
	11th to 20th	Day	41% 8% 14% 24% 12%	2445
	21st to end	Day	43% 8% 12% 27% 9%	2591
August	1st to 10th	Day	46% 7% 15% 21% 11%	2363
	11th to 20th	Day	45% 8% 15% 24% 8% 1	2303
	21st to end	Day	44% 7% 14% 25% 9% 1	2413
September	1st to 10th	Day	43% 6% 12% 27% 11% 1	2160
	11th to 20th	Day	41% 5% 11% 29% 13%	2160
	21st to end	Day	49% 5% 13% 23% 10%	1891
October	1st to 10th	Day	52% 5% 10% 20% 11% 1	1800
	11th to 20th	Day	61% 5% 12% 16% 5% 1	1800
	21st to end	Day	65% 5% 10% 13% 6% 1	1904
November	1st to 10th	Day	51% 6% 13% 22% 7% 1	1596
	11th to 20th	Day	59% 5% 12% 13% 9% 1	1520
	21st to end	Day	68% 6% 10% 10% 6% 1	1520
December	1st to 10th	Day	74% 5% 8% 9% 3	1520
	11th to 20th	Day	64% 6% 11% 12% 7%	1906
	21st to end	Day	75% 2 6% 14% 3	2772
January	1st to 10th	Night	69% 4 10% 11% 5%	2649
	11th to 20th	Night	67% 4 9% 11% 7% 1	2569
	21st to end	Night	60% 5% 7% 15% 11% 1	2624
February	1st to 10th	Night	64% 4 11% 13% 7% 1	2340
	11th to 20th	Night	57% 5% 11% 19% 8% 1	2275
	21st to end	Night	57% 4 10% 18% 10% 1	1834
March	1st to 10th	Night	56% 4 10% 18% 10% 2	2080
	11th to 20th	Night	54% 4 10% 19% 12% 1	1980
	21st to end	Night	48% 5% 8% 21% 15% 3	2120
April	1st to 10th	Night	55% 3 8% 20% 12% 2	1800
	11th to 20th	Night	49% 3 8% 23% 14% 1	1775
	21st to end	Night	53% 5% 7% 17% 16% 2	1652
May	1st to 10th	Night	48% 5% 7% 20% 16% 4	1463
	11th to 20th	Night	43% 4 8% 25% 16% 2	1416
	21st to end	Night	36% 8% 15% 21% 18% 3	1551
June	1st to 10th	Night	45% 6% 14% 24% 10% 1	1440
	11th to 20th	Night	39% 7% 10% 26% 16% 2	1440
	21st to end	Night	43% 7% 15% 21% 13% 1	1440
July	1st to 10th	Night	34% 8% 13% 24% 19% 2	1400
	11th to 20th	Night	37% 6% 12% 31% 13%	1392
	21st to end	Night	34% 7% 17% 30% 11% 1	1486
August	1st to 10th	Night	36% 8% 17% 25% 12% 1	1548
	11th to 20th	Night	36% 7% 16% 30% 10% 1	1598
	21st to end	Night	37% 6% 16% 29% 11% 1	1924
September	1st to 10th	Night	37% 6% 15% 28% 14% 1	1800
	11th to 20th	Night	36% 5% 14% 34% 11% 1	1800
	21st to end	Night	43% 5% 12% 31% 9%	2066
October	1st to 10th	Night	49% 5% 11% 21% 15%	2160
	11th to 20th	Night	57% 5% 13% 17% 7%	2160
	21st to end	Night	60% 6% 11% 14% 8%	2452
November	1st to 10th	Night	52% 5% 13% 20% 8%	2478
	11th to 20th	Night	59% 5% 11% 16% 7% 1	2660
	21st to end	Night	64% 6% 12% 14% 4	2660
December	1st to 10th	Night	71% 5% 10% 11% 3	2660
	11th to 20th	Night	66% 4 9% 13% 7% 1	3288
	21st to end	Night	77% 3 7% 11% 3	4884

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	24% 24% 35% 11% 5% 1	180
	11th to 20th	Day	27% 20% 36% 13% 5%	166
	21st to end	Day	22% 25% 35% 14% 3	241
February	1st to 10th	Day	31% 30% 31% 6% 2	240
	11th to 20th	Day	26% 30% 40% 3	240
	21st to end	Day	35% 23% 32% 9% 1	286
March	1st to 10th	Day	25% 25% 34% 14% 2	420
	11th to 20th	Day	30% 20% 32% 14% 4	420
	21st to end	Day	33% 21% 29% 12% 5% 1	462
April	1st to 10th	Day	29% 23% 29% 14% 5%	420
	11th to 20th	Day	33% 20% 22% 13% 10% 2	412
	21st to end	Day	32% 20% 32% 10% 5% 1	420
May	1st to 10th	Day	26% 19% 28% 17% 6% 3	423
	11th to 20th	Day	22% 17% 33% 18% 7% 2	447
	21st to end	Day	21% 16% 34% 17% 9% 2	485
June	1st to 10th	Day	26% 14% 36% 18% 6%	450
	11th to 20th	Day	17% 19% 28% 23% 9% 3	450
	21st to end	Day	18% 14% 35% 19% 11% 2	450
July	1st to 10th	Day	11% 8% 33% 36% 9% 2	445
	11th to 20th	Day	13% 13% 33% 26% 12% 2	444
	21st to end	Day	15% 9% 39% 25% 9% 3	488
August	1st to 10th	Day	16% 9% 33% 28% 11% 4	446
	11th to 20th	Day	14% 9% 30% 27% 14% 5%	439
	21st to end	Day	16% 14% 30% 25% 11% 5%	495
September	1st to 10th	Day	16% 14% 30% 20% 14% 5%	450
	11th to 20th	Day	14% 13% 26% 24% 14% 9%	450
	21st to end	Day	20% 15% 28% 21% 10% 6%	450
October	1st to 10th	Day	26% 17% 26% 17% 11% 4	450
	11th to 20th	Day	28% 23% 29% 14% 5% 1	450
	21st to end	Day	31% 19% 29% 16% 4	457
November	1st to 10th	Day	24% 22% 32% 16% 6%	290
	11th to 20th	Day	31% 22% 32% 9% 6% 1	180
	21st to end	Day	29% 29% 31% 8% 3 1	180
December	1st to 10th	Day	29% 18% 39% 13% 1	180
	11th to 20th	Day	32% 33% 23% 9% 2 1	180
	21st to end	Day	31% 27% 28% 11% 2 1	198
January	1st to 10th	Night	24% 22% 35% 15% 4	760
	11th to 20th	Night	25% 19% 32% 18% 5% 1	735
	21st to end	Night	17% 19% 36% 22% 6% 1	792
February	1st to 10th	Night	21% 23% 39% 15% 3	720
	11th to 20th	Night	21% 22% 39% 14% 3	703
	21st to end	Night	22% 23% 33% 19% 3	592
March	1st to 10th	Night	23% 22% 33% 18% 3	720
	11th to 20th	Night	25% 20% 33% 17% 4 1	720
	21st to end	Night	20% 19% 34% 20% 7%	792
April	1st to 10th	Night	28% 18% 31% 20% 4	720
	11th to 20th	Night	24% 21% 29% 18% 8%	711
	21st to end	Night	24% 17% 26% 23% 9% 1	572
May	1st to 10th	Night	25% 10% 27% 29% 9% 1	383
	11th to 20th	Night	21% 11% 32% 28% 7%	354
	21st to end	Night	15% 11% 34% 30% 10%	389
June	1st to 10th	Night	17% 10% 38% 28% 7% 1	360
	11th to 20th	Night	19% 9% 32% 30% 10% 1	360
	21st to end	Night	18% 11% 28% 30% 12% 1	360
July	1st to 10th	Night	9% 9% 35% 34% 12% 1	350
	11th to 20th	Night	11% 7% 29% 39% 14%	348
	21st to end	Night	9% 6% 34% 39% 11% 2	394
August	1st to 10th	Night	11% 4 28% 37% 19% 1	484
	11th to 20th	Night	9% 5% 25% 37% 20% 3	534
	21st to end	Night	14% 8% 30% 30% 16% 2	736
September	1st to 10th	Night	14% 9% 31% 28% 16% 2	720
	11th to 20th	Night	19% 6% 26% 28% 17% 3	720
	21st to end	Night	21% 12% 24% 25% 16% 3	720
October	1st to 10th	Night	24% 13% 28% 21% 11% 2	720
	11th to 20th	Night	28% 16% 31% 17% 8% 1	720
	21st to end	Night	30% 16% 29% 20% 5%	792
November	1st to 10th	Night	26% 16% 30% 22% 6% 1	740
	11th to 20th	Night	26% 21% 29% 15% 8% 1	760
	21st to end	Night	31% 18% 27% 20% 4	760
December	1st to 10th	Night	28% 20% 33% 15% 4	760
	11th to 20th	Night	26% 23% 31% 17% 3 1	760
	21st to end	Night	33% 19% 30% 15% 2	836

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