Rouge Matawin
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rouge Matawin clear sky chart from 2005-11-06 to 2024-07-05.

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% 13% 4 10% 6% 5% 5% 3 5% 6% 26%	89578
	Night	15% 13% 5% 11% 6% 5% 5% 3 5% 5% 26%	89665
Transparency	Day	58% 4 10% 17% 9% 1	89297
	Night	59% 4 10% 17% 8% 1	89500
Seeing	Day	25% 17% 31% 18% 7% 2	13982
	Night	23% 15% 31% 23% 8% 1	22992

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	12% 18% 8% 17% 9% 7% 4 3 3 4 15%	2517
	11th to 20th	Day	10% 14% 6% 21% 11% 7% 3 2 3 3 19%	2520
	21st to end	Day	9% 13% 7% 18% 7% 6% 7% 5% 6% 5% 17%	2772
February	1st to 10th	Day	8% 17% 6% 15% 10% 7% 4 4 4 6% 20%	1658
	11th to 20th	Day	9% 18% 6% 14% 8% 6% 5% 4 4 5% 22%	1715
	21st to end	Day	13% 19% 6% 11% 8% 6% 4 3 4 4 22%	1570
March	1st to 10th	Day	12% 20% 5% 11% 7% 5% 4 3 4 4 24%	3116
	11th to 20th	Day	11% 19% 7% 14% 7% 4 4 3 4 4 22%	3320
	21st to end	Day	9% 14% 4 10% 5% 5% 4 3 5% 6% 34%	4130
April	1st to 10th	Day	18% 19% 4 9% 5% 3 4 3 4 5% 25%	2280
	11th to 20th	Day	21% 12% 4 7% 4 4 4 3 4 5% 32%	2254
	21st to end	Day	19% 13% 4 9% 5% 4 4 3 4 4 29%	2462
May	1st to 10th	Day	20% 12% 4 8% 5% 5% 5% 3 5% 5% 27%	4426
	11th to 20th	Day	18% 8% 3 8% 6% 6% 6% 5% 6% 7% 29%	4398
	21st to end	Day	17% 9% 3 8% 5% 5% 5% 4 5% 7% 32%	4837
June	1st to 10th	Day	24% 10% 3 8% 4 5% 5% 3 5% 7% 26%	2660
	11th to 20th	Day	17% 8% 3 8% 6% 5% 5% 4 7% 8% 31%	2660
	21st to end	Day	23% 9% 3 8% 6% 5% 5% 3 6% 6% 25%	2660
July	1st to 10th	Day	15% 8% 3 8% 6% 6% 5% 5% 6% 7% 31%	2576
	11th to 20th	Day	14% 8% 3 8% 6% 5% 5% 5% 8% 9% 29%	2520
	21st to end	Day	13% 9% 3 9% 6% 5% 5% 4 6% 9% 31%	2744
August	1st to 10th	Day	16% 10% 3 8% 6% 7% 5% 5% 6% 8% 26%	2506
	11th to 20th	Day	16% 8% 3 9% 5% 5% 5% 4 6% 7% 32%	2334
	21st to end	Day	16% 8% 3 9% 5% 5% 5% 4 6% 9% 32%	2376
September	1st to 10th	Day	18% 7% 2 7% 4 4 5% 4 5% 8% 37%	2160
	11th to 20th	Day	16% 9% 2 8% 4 4 4 4 5% 7% 37%	2106
	21st to end	Day	21% 8% 3 6% 4 4 4 2 5% 6% 36%	1980
October	1st to 10th	Day	21% 12% 3 8% 5% 5% 5% 3 5% 5% 28%	1822
	11th to 20th	Day	23% 17% 4 10% 5% 4 4 3 3 4 22%	1765
	21st to end	Day	24% 17% 4 10% 5% 5% 4 3 3 5% 20%	1782
November	1st to 10th	Day	14% 17% 5% 10% 5% 4 3 4 5% 5% 28%	1671
	11th to 20th	Day	17% 18% 6% 13% 7% 5% 4 3 4 4 20%	1563
	21st to end	Day	16% 21% 6% 15% 7% 4 4 2 4 4 19%	1520
December	1st to 10th	Day	19% 22% 6% 11% 8% 5% 4 3 3 4 14%	1520
	11th to 20th	Day	17% 17% 7% 14% 7% 5% 3 3 6% 5% 15%	1906
	21st to end	Day	17% 21% 6% 15% 7% 5% 4 2 4 4 16%	2772
January	1st to 10th	Night	12% 17% 8% 17% 8% 5% 5% 3 4 4 17%	4429
	11th to 20th	Night	9% 12% 6% 16% 14% 9% 6% 4 5% 4 15%	4440
	21st to end	Night	8% 15% 8% 18% 8% 7% 6% 3 5% 5% 16%	4884
February	1st to 10th	Night	9% 15% 6% 13% 8% 7% 6% 5% 5% 6% 19%	2518
	11th to 20th	Night	8% 14% 7% 14% 9% 7% 6% 5% 6% 4 20%	2350
	21st to end	Night	11% 14% 6% 11% 7% 6% 6% 4 5% 5% 26%	1884
March	1st to 10th	Night	17% 17% 5% 10% 5% 4 5% 3 4 4 24%	3724
	11th to 20th	Night	14% 20% 6% 12% 6% 4 3 2 4 4 25%	3624
	21st to end	Night	10% 11% 5% 11% 7% 6% 5% 3 5% 5% 32%	3501
April	1st to 10th	Night	21% 13% 4 10% 5% 4 3 3 5% 5% 28%	1900
	11th to 20th	Night	16% 12% 4 7% 4 5% 4 2 5% 6% 35%	1875
	21st to end	Night	19% 12% 4 9% 4 2 3 3 5% 4 34%	1732
May	1st to 10th	Night	18% 11% 3 9% 5% 5% 5% 4 5% 6% 29%	2514
	11th to 20th	Night	18% 9% 3 7% 4 5% 4 4 5% 8% 33%	2495
	21st to end	Night	18% 8% 3 8% 5% 5% 5% 4 6% 7% 31%	2738
June	1st to 10th	Night	19% 10% 3 7% 5% 5% 5% 4 5% 7% 31%	1520
	11th to 20th	Night	16% 8% 3 5% 6% 4 4 4 5% 7% 37%	1520
	21st to end	Night	20% 8% 2 6% 5% 4 5% 4 6% 7% 33%	1520
July	1st to 10th	Night	13% 7% 2 6% 6% 4 5% 3 7% 9% 38%	1478
	11th to 20th	Night	11% 7% 2 7% 4 5% 5% 4 5% 9% 40%	1440
	21st to end	Night	11% 7% 2 6% 5% 5% 5% 5% 8% 8% 38%	1574
August	1st to 10th	Night	12% 6% 3 5% 5% 5% 6% 5% 7% 8% 38%	1432
	11th to 20th	Night	12% 7% 3 8% 5% 5% 4 4 6% 7% 39%	1545
	21st to end	Night	15% 7% 3 6% 5% 5% 5% 4 7% 7% 37%	1980
September	1st to 10th	Night	15% 9% 3 7% 3 4 4 3 5% 7% 41%	1800
	11th to 20th	Night	17% 7% 2 6% 4 4 3 3 5% 6% 42%	1854
	21st to end	Night	17% 9% 3 6% 4 2 4 3 5% 7% 40%	1980
October	1st to 10th	Night	16% 10% 3 7% 5% 5% 3 3 4 6% 37%	2136
	11th to 20th	Night	21% 15% 4 8% 5% 4 4 3 5% 5% 26%	2193
	21st to end	Night	22% 16% 4 10% 5% 5% 4 3 4 5% 21%	2574
November	1st to 10th	Night	15% 15% 5% 9% 6% 5% 5% 3 6% 6% 25%	2407
	11th to 20th	Night	14% 14% 6% 13% 7% 5% 5% 4 5% 5% 22%	2612
	21st to end	Night	17% 18% 7% 14% 7% 4 4 3 5% 5% 17%	2660
December	1st to 10th	Night	15% 20% 7% 16% 8% 6% 5% 3 4 3 13%	2660
	11th to 20th	Night	18% 17% 6% 14% 7% 6% 4 3 4 4 18%	3288
	21st to end	Night	18% 21% 8% 13% 8% 5% 3 3 3 3 16%	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	72% 6% 7% 11% 4	2518
	11th to 20th	Day	70% 3 5% 15% 6% 1	2520
	21st to end	Day	68% 4 8% 13% 7% 1	2772
February	1st to 10th	Day	66% 3 6% 16% 7% 2	1658
	11th to 20th	Day	65% 3 7% 13% 10% 1	1724
	21st to end	Day	66% 3 5% 14% 9% 2	1570
March	1st to 10th	Day	65% 2 7% 13% 11% 2	3119
	11th to 20th	Day	66% 3 8% 10% 10% 3	3320
	21st to end	Day	50% 4 9% 19% 16% 2	4130
April	1st to 10th	Day	62% 3 8% 15% 11% 2	2280
	11th to 20th	Day	57% 3 7% 20% 12% 2	2254
	21st to end	Day	59% 4 7% 16% 13% 3	2462
May	1st to 10th	Day	56% 4 9% 19% 10% 1	4440
	11th to 20th	Day	51% 5% 15% 19% 8% 1	4402
	21st to end	Day	52% 4 10% 18% 14% 1	4837
June	1st to 10th	Day	58% 5% 8% 18% 10% 1	2660
	11th to 20th	Day	51% 4 12% 20% 11% 2	2660
	21st to end	Day	59% 4 12% 16% 8%	2660
July	1st to 10th	Day	48% 5% 13% 24% 9%	2506
	11th to 20th	Day	47% 5% 16% 23% 9%	2445
	21st to end	Day	50% 6% 15% 22% 7%	2591
August	1st to 10th	Day	54% 6% 15% 20% 4	2492
	11th to 20th	Day	49% 6% 16% 22% 7%	2334
	21st to end	Day	47% 6% 13% 23% 11%	2376
September	1st to 10th	Day	44% 5% 15% 24% 11% 1	2160
	11th to 20th	Day	47% 4 13% 26% 9% 1	2106
	21st to end	Day	49% 4 12% 25% 9%	1980
October	1st to 10th	Day	57% 4 11% 18% 9% 1	1822
	11th to 20th	Day	66% 5% 9% 15% 4 1	1765
	21st to end	Day	68% 3 9% 13% 6% 1	1782
November	1st to 10th	Day	58% 3 12% 19% 8% 1	1671
	11th to 20th	Day	68% 4 8% 12% 7% 1	1563
	21st to end	Day	70% 4 7% 12% 6% 1	1520
December	1st to 10th	Day	74% 3 6% 11% 5%	1520
	11th to 20th	Day	69% 4 6% 13% 7%	1906
	21st to end	Day	71% 4 5% 13% 6%	2772
January	1st to 10th	Night	71% 3 10% 12% 4	4429
	11th to 20th	Night	69% 6% 8% 12% 4 1	4440
	21st to end	Night	71% 3 7% 10% 8% 1	4884
February	1st to 10th	Night	64% 5% 6% 17% 7% 1	2518
	11th to 20th	Night	64% 5% 7% 15% 8% 1	2352
	21st to end	Night	59% 4 6% 17% 12% 1	1884
March	1st to 10th	Night	64% 3 10% 11% 10% 3	3734
	11th to 20th	Night	65% 3 6% 14% 12% 1	3625
	21st to end	Night	54% 4 8% 18% 12% 4	3501
April	1st to 10th	Night	59% 3 8% 16% 12% 2	1900
	11th to 20th	Night	50% 4 9% 23% 12% 2	1875
	21st to end	Night	54% 4 8% 21% 12% 2	1732
May	1st to 10th	Night	56% 4 14% 17% 8% 2	2520
	11th to 20th	Night	49% 5% 17% 17% 12% 2	2496
	21st to end	Night	52% 4 12% 20% 11% 1	2739
June	1st to 10th	Night	52% 5% 12% 21% 10%	1520
	11th to 20th	Night	47% 4 13% 22% 11% 3	1520
	21st to end	Night	48% 6% 14% 20% 11% 1	1520
July	1st to 10th	Night	42% 5% 17% 26% 9% 1	1438
	11th to 20th	Night	40% 6% 17% 28% 8% 1	1392
	21st to end	Night	42% 6% 19% 25% 8%	1486
August	1st to 10th	Night	41% 7% 21% 26% 6%	1422
	11th to 20th	Night	43% 6% 19% 25% 9%	1545
	21st to end	Night	44% 6% 15% 26% 9%	1980
September	1st to 10th	Night	42% 5% 16% 25% 12%	1800
	11th to 20th	Night	42% 4 15% 29% 8% 1	1854
	21st to end	Night	44% 4 13% 28% 10%	1980
October	1st to 10th	Night	50% 3 11% 25% 11% 1	2136
	11th to 20th	Night	60% 4 12% 18% 6%	2193
	21st to end	Night	65% 3 9% 15% 6% 1	2574
November	1st to 10th	Night	58% 6% 12% 18% 6% 1	2407
	11th to 20th	Night	63% 4 9% 15% 7% 2	2612
	21st to end	Night	69% 5% 7% 14% 5%	2660
December	1st to 10th	Night	76% 3 7% 10% 4	2660
	11th to 20th	Night	69% 5% 5% 13% 7% 1	3288
	21st to end	Night	74% 3 5% 12% 6%	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	23% 22% 37% 17% 2	180
	11th to 20th	Day	26% 16% 36% 14% 6% 1	180
	21st to end	Day	18% 18% 37% 21% 6%	198
February	1st to 10th	Day	28% 29% 33% 7% 2 1	246
	11th to 20th	Day	25% 25% 39% 10%	322
	21st to end	Day	29% 26% 31% 12% 2	382
March	1st to 10th	Day	26% 19% 35% 16% 3	460
	11th to 20th	Day	25% 23% 35% 13% 3 1	460
	21st to end	Day	28% 21% 30% 14% 5% 1	506
April	1st to 10th	Day	30% 19% 30% 15% 5% 1	460
	11th to 20th	Day	34% 18% 26% 12% 9% 2	452
	21st to end	Day	30% 20% 30% 14% 4 1	460
May	1st to 10th	Day	30% 17% 32% 15% 5% 2	463
	11th to 20th	Day	26% 15% 31% 20% 7% 1	487
	21st to end	Day	26% 18% 31% 19% 5% 1	529
June	1st to 10th	Day	28% 14% 33% 19% 5% 1	490
	11th to 20th	Day	21% 20% 30% 19% 10% 2	490
	21st to end	Day	28% 14% 29% 22% 6% 2	490
July	1st to 10th	Day	15% 12% 38% 25% 7% 3	461
	11th to 20th	Day	18% 9% 36% 30% 5% 2	444
	21st to end	Day	16% 10% 33% 28% 11% 2	488
August	1st to 10th	Day	17% 12% 30% 26% 12% 2	446
	11th to 20th	Day	16% 8% 30% 29% 12% 6%	439
	21st to end	Day	21% 12% 31% 19% 11% 6%	495
September	1st to 10th	Day	18% 15% 31% 21% 10% 5%	450
	11th to 20th	Day	18% 13% 28% 22% 14% 5%	450
	21st to end	Day	21% 16% 24% 23% 11% 6%	450
October	1st to 10th	Day	26% 17% 28% 16% 9% 4	450
	11th to 20th	Day	30% 21% 26% 16% 5% 3	432
	21st to end	Day	35% 16% 28% 17% 4	396
November	1st to 10th	Day	28% 20% 29% 17% 5% 1	365
	11th to 20th	Day	30% 22% 33% 11% 5%	223
	21st to end	Day	30% 26% 31% 8% 4 1	180
December	1st to 10th	Day	29% 18% 32% 12% 8% 1	180
	11th to 20th	Day	30% 24% 31% 12% 3 1	180
	21st to end	Day	34% 20% 31% 10% 3 2	198
January	1st to 10th	Night	23% 20% 37% 14% 5%	760
	11th to 20th	Night	21% 18% 36% 19% 6%	760
	21st to end	Night	15% 17% 40% 22% 6%	836
February	1st to 10th	Night	17% 21% 37% 21% 4	760
	11th to 20th	Night	18% 22% 39% 17% 4	743
	21st to end	Night	21% 19% 36% 21% 4	628
March	1st to 10th	Night	26% 17% 32% 21% 4	760
	11th to 20th	Night	24% 19% 33% 18% 5% 1	760
	21st to end	Night	20% 18% 33% 22% 6% 1	836
April	1st to 10th	Night	29% 14% 27% 24% 5% 1	760
	11th to 20th	Night	25% 17% 28% 22% 9%	751
	21st to end	Night	29% 14% 28% 22% 6% 1	592
May	1st to 10th	Night	25% 9% 29% 26% 10% 1	380
	11th to 20th	Night	22% 8% 33% 29% 8%	374
	21st to end	Night	21% 10% 39% 22% 7%	411
June	1st to 10th	Night	22% 9% 33% 30% 6% 1	380
	11th to 20th	Night	21% 9% 27% 29% 13% 1	380
	21st to end	Night	22% 8% 20% 36% 14% 1	380
July	1st to 10th	Night	13% 7% 33% 36% 11% 1	360
	11th to 20th	Night	13% 7% 29% 36% 13% 2	348
	21st to end	Night	12% 6% 29% 39% 13% 1	394
August	1st to 10th	Night	13% 6% 20% 44% 16% 1	358
	11th to 20th	Night	15% 4 23% 34% 22% 2	481
	21st to end	Night	19% 8% 28% 27% 15% 3	792
September	1st to 10th	Night	19% 8% 27% 33% 13% 1	720
	11th to 20th	Night	21% 7% 27% 28% 16% 2	720
	21st to end	Night	21% 11% 27% 24% 15% 2	720
October	1st to 10th	Night	23% 14% 27% 24% 11% 1	720
	11th to 20th	Night	29% 15% 28% 18% 8% 1	720
	21st to end	Night	29% 17% 27% 21% 6%	792
November	1st to 10th	Night	25% 19% 29% 20% 6% 1	740
	11th to 20th	Night	24% 18% 32% 17% 8% 1	760
	21st to end	Night	28% 20% 28% 18% 5% 1	760
December	1st to 10th	Night	28% 19% 30% 18% 5% 1	760
	11th to 20th	Night	26% 18% 33% 16% 6% 1	760
	21st to end	Night	31% 20% 29% 17% 4	836

Page generated at 2024-07-02 06:41:33. Version ac07

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