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 2024-06-17.

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	16% 12% 4 9% 5% 5% 4 3 5% 6% 30%	89437
	Night	16% 13% 4 10% 6% 5% 4 3 5% 6% 29%	89429
Transparency	Day	54% 5% 10% 19% 10% 1	89156
	Night	55% 5% 11% 19% 9% 1	89264
Seeing	Day	23% 18% 31% 18% 7% 2	13853
	Night	22% 16% 31% 22% 8% 1	23114

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	15% 17% 5% 16% 8% 5% 4 3 4 3 19%	2517
	11th to 20th	Day	13% 14% 7% 20% 7% 6% 4 3 5% 5% 16%	2520
	21st to end	Day	16% 20% 8% 16% 6% 5% 3 3 2 4 17%	3029
February	1st to 10th	Day	12% 17% 5% 16% 9% 5% 5% 4 5% 4 20%	1710
	11th to 20th	Day	11% 16% 7% 12% 6% 5% 4 3 5% 5% 26%	1663
	21st to end	Day	17% 16% 5% 9% 7% 5% 5% 5% 4 5% 23%	1506
March	1st to 10th	Day	17% 17% 5% 10% 5% 4 4 3 3 6% 26%	3265
	11th to 20th	Day	10% 18% 6% 12% 6% 4 4 3 5% 6% 26%	3480
	21st to end	Day	11% 10% 4 8% 5% 4 4 3 5% 5% 43%	3928
April	1st to 10th	Day	20% 15% 3 8% 5% 5% 4 2 4 5% 29%	2280
	11th to 20th	Day	22% 12% 3 6% 4 4 3 3 3 4 36%	2254
	21st to end	Day	22% 12% 3 8% 5% 3 3 3 4 5% 33%	2451
May	1st to 10th	Day	20% 9% 3 8% 4 5% 5% 4 5% 6% 32%	4386
	11th to 20th	Day	16% 10% 3 8% 5% 4 4 4 5% 8% 32%	4398
	21st to end	Day	15% 7% 2 7% 5% 5% 4 3 5% 7% 38%	4837
June	1st to 10th	Day	22% 9% 3 7% 5% 4 5% 4 5% 6% 30%	2660
	11th to 20th	Day	16% 6% 3 6% 5% 5% 5% 4 6% 8% 37%	2607
	21st to end	Day	17% 8% 2 7% 5% 4 5% 4 6% 9% 32%	2520
July	1st to 10th	Day	12% 7% 2 6% 5% 5% 5% 5% 6% 7% 38%	2520
	11th to 20th	Day	12% 6% 3 7% 5% 5% 6% 4 7% 9% 37%	2520
	21st to end	Day	12% 7% 2 6% 5% 6% 5% 5% 7% 10% 36%	2744
August	1st to 10th	Day	13% 7% 3 8% 6% 5% 6% 4 6% 8% 35%	2377
	11th to 20th	Day	14% 6% 3 7% 6% 5% 5% 3 7% 8% 36%	2303
	21st to end	Day	15% 6% 3 6% 5% 5% 5% 4 7% 9% 35%	2413
September	1st to 10th	Day	16% 7% 3 6% 4 6% 4 4 5% 7% 39%	2160
	11th to 20th	Day	14% 8% 2 6% 4 4 4 3 5% 7% 42%	2160
	21st to end	Day	18% 8% 2 7% 5% 4 4 4 5% 5% 36%	1891
October	1st to 10th	Day	22% 10% 3 6% 5% 4 3 4 5% 5% 33%	1800
	11th to 20th	Day	23% 14% 4 8% 5% 5% 4 3 4 6% 25%	1800
	21st to end	Day	26% 14% 4 8% 6% 4 5% 3 4 5% 21%	1904
November	1st to 10th	Day	14% 13% 3 8% 5% 5% 5% 3 4 6% 33%	1596
	11th to 20th	Day	16% 15% 6% 10% 6% 4 4 3 5% 5% 25%	1520
	21st to end	Day	19% 18% 6% 11% 6% 5% 4 3 4 5% 17%	1520
December	1st to 10th	Day	20% 22% 7% 12% 6% 5% 5% 3 3 4 14%	1520
	11th to 20th	Day	17% 18% 5% 12% 6% 4 4 3 4 5% 22%	1906
	21st to end	Day	23% 20% 6% 16% 5% 3 2 1 3 3 17%	2772
January	1st to 10th	Night	15% 17% 9% 14% 7% 5% 5% 3 5% 5% 15%	4429
	11th to 20th	Night	10% 14% 6% 16% 10% 7% 6% 4 5% 6% 16%	4440
	21st to end	Night	15% 18% 8% 13% 7% 7% 5% 3 4 3 18%	4624
February	1st to 10th	Night	11% 18% 6% 12% 8% 6% 5% 4 4 5% 21%	2470
	11th to 20th	Night	12% 14% 6% 11% 6% 5% 4 4 5% 5% 28%	2403
	21st to end	Night	12% 16% 4 10% 6% 5% 4 4 5% 6% 27%	1946
March	1st to 10th	Night	18% 13% 4 10% 6% 4 3 3 4 5% 31%	3574
	11th to 20th	Night	12% 17% 6% 12% 6% 4 4 3 5% 6% 23%	3479
	21st to end	Night	11% 11% 5% 9% 6% 4 4 4 5% 6% 36%	3704
April	1st to 10th	Night	19% 13% 4 9% 5% 4 3 3 4 5% 32%	1900
	11th to 20th	Night	18% 11% 4 6% 4 5% 4 2 4 5% 37%	1875
	21st to end	Night	19% 12% 3 7% 5% 5% 3 3 5% 6% 32%	1743
May	1st to 10th	Night	20% 10% 3 6% 4 4 5% 4 5% 6% 35%	2551
	11th to 20th	Night	18% 8% 3 6% 6% 5% 4 3 5% 7% 36%	2495
	21st to end	Night	13% 7% 2 7% 4 4 4 4 6% 7% 41%	2738
June	1st to 10th	Night	16% 8% 3 8% 5% 4 5% 4 6% 8% 34%	1520
	11th to 20th	Night	14% 6% 3 6% 4 4 4 4 4 7% 43%	1496
	21st to end	Night	17% 6% 2 7% 4 4 5% 5% 6% 7% 36%	1440
July	1st to 10th	Night	9% 5% 2 5% 6% 5% 5% 5% 5% 8% 45%	1440
	11th to 20th	Night	11% 6% 2 6% 5% 4 4 4 5% 8% 44%	1440
	21st to end	Night	8% 6% 2 6% 5% 4 5% 4 6% 9% 45%	1574
August	1st to 10th	Night	10% 5% 2 6% 4 4 5% 5% 7% 8% 44%	1558
	11th to 20th	Night	9% 6% 2 5% 5% 4 4 4 6% 8% 46%	1598
	21st to end	Night	12% 6% 2 6% 4 4 4 3 6% 8% 45%	1924
September	1st to 10th	Night	12% 6% 2 5% 4 4 4 4 5% 7% 46%	1800
	11th to 20th	Night	15% 5% 2 5% 4 3 4 3 4 6% 49%	1800
	21st to end	Night	16% 8% 3 6% 4 3 4 3 6% 5% 41%	2066
October	1st to 10th	Night	19% 10% 3 6% 4 4 4 3 4 6% 37%	2160
	11th to 20th	Night	20% 14% 3 8% 5% 5% 4 3 4 5% 29%	2160
	21st to end	Night	21% 15% 4 8% 5% 5% 4 4 4 6% 24%	2452
November	1st to 10th	Night	15% 14% 4 8% 6% 4 4 3 5% 6% 32%	2478
	11th to 20th	Night	17% 14% 5% 10% 5% 5% 5% 3 4 5% 26%	2660
	21st to end	Night	18% 17% 5% 11% 6% 5% 4 4 5% 5% 20%	2660
December	1st to 10th	Night	18% 20% 7% 13% 7% 5% 4 3 4 5% 15%	2660
	11th to 20th	Night	17% 20% 6% 12% 5% 4 3 3 3 4 22%	3288
	21st to end	Night	25% 20% 6% 15% 6% 3 3 2 3 3 13%	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	69% 5% 11% 8% 7% 1	2518
	11th to 20th	Day	69% 6% 8% 11% 6% 1	2520
	21st to end	Day	73% 4 6% 10% 6% 1	3029
February	1st to 10th	Day	66% 5% 8% 15% 5% 1	1710
	11th to 20th	Day	60% 4 10% 15% 9% 1	1672
	21st to end	Day	62% 5% 9% 12% 10% 2	1506
March	1st to 10th	Day	60% 4 10% 13% 12% 1	3268
	11th to 20th	Day	59% 4 11% 16% 9% 2	3480
	21st to end	Day	42% 4 8% 25% 17% 4	3928
April	1st to 10th	Day	58% 4 6% 18% 12% 3	2280
	11th to 20th	Day	53% 4 6% 21% 15% 2	2254
	21st to end	Day	54% 4 7% 17% 15% 3	2451
May	1st to 10th	Day	51% 5% 9% 21% 11% 2	4400
	11th to 20th	Day	48% 7% 12% 21% 10% 2	4402
	21st to end	Day	45% 5% 12% 20% 15% 3	4837
June	1st to 10th	Day	53% 6% 10% 19% 11% 1	2660
	11th to 20th	Day	44% 6% 11% 23% 14% 2	2607
	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	70% 4 12% 10% 3	4429
	11th to 20th	Night	68% 5% 12% 11% 4 1	4440
	21st to end	Night	71% 4 9% 9% 6%	4624
February	1st to 10th	Night	64% 4 11% 14% 7% 1	2470
	11th to 20th	Night	58% 5% 10% 19% 7% 1	2405
	21st to end	Night	56% 4 10% 18% 10% 1	1946
March	1st to 10th	Night	57% 4 10% 19% 9% 1	3584
	11th to 20th	Night	60% 5% 12% 15% 7% 1	3480
	21st to end	Night	46% 6% 8% 23% 15% 2	3704
April	1st to 10th	Night	55% 3 8% 20% 12% 2	1900
	11th to 20th	Night	50% 3 8% 23% 14% 1	1875
	21st to end	Night	53% 5% 8% 17% 16% 2	1743
May	1st to 10th	Night	48% 7% 10% 22% 10% 2	2557
	11th to 20th	Night	45% 8% 12% 24% 9% 1	2496
	21st to end	Night	40% 7% 12% 24% 16% 2	2739
June	1st to 10th	Night	45% 6% 13% 24% 10% 1	1520
	11th to 20th	Night	39% 7% 10% 26% 16% 2	1496
	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% 21% 36% 12% 4	180
	21st to end	Day	23% 24% 34% 15% 3	271
February	1st to 10th	Day	29% 29% 31% 8% 3	270
	11th to 20th	Day	26% 30% 40% 4	270
	21st to end	Day	34% 24% 33% 9% 1	318
March	1st to 10th	Day	25% 25% 34% 13% 2	460
	11th to 20th	Day	29% 20% 33% 15% 3	460
	21st to end	Day	32% 24% 29% 11% 4 1	506
April	1st to 10th	Day	30% 23% 29% 13% 5%	460
	11th to 20th	Day	35% 20% 22% 12% 9% 2	452
	21st to end	Day	32% 20% 31% 10% 5% 1	460
May	1st to 10th	Day	26% 19% 29% 16% 7% 3	463
	11th to 20th	Day	21% 16% 33% 20% 8% 2	487
	21st to end	Day	22% 17% 33% 17% 9% 2	529
June	1st to 10th	Day	25% 14% 36% 18% 7%	490
	11th to 20th	Day	16% 19% 29% 23% 9% 3	475
	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	26% 20% 31% 18% 5% 1	760
	21st to end	Night	17% 18% 36% 22% 6%	836
February	1st to 10th	Night	21% 22% 38% 17% 3	760
	11th to 20th	Night	20% 23% 39% 14% 3	743
	21st to end	Night	22% 23% 33% 19% 3	628
March	1st to 10th	Night	24% 22% 34% 17% 4	760
	11th to 20th	Night	24% 21% 33% 17% 4 1	760
	21st to end	Night	20% 20% 34% 19% 7%	836
April	1st to 10th	Night	29% 17% 31% 19% 4	760
	11th to 20th	Night	25% 21% 29% 17% 8%	751
	21st to end	Night	25% 16% 26% 23% 9%	603
May	1st to 10th	Night	24% 10% 27% 29% 9% 1	404
	11th to 20th	Night	21% 11% 32% 29% 7%	374
	21st to end	Night	15% 11% 33% 30% 10%	411
June	1st to 10th	Night	17% 9% 37% 29% 7% 1	380
	11th to 20th	Night	19% 9% 32% 30% 10% 1	374
	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

Page generated at 2024-06-14 13:06:12. Version ac07

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