Rouyn-Noranda
Clear Sky Chart
History

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

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	17% 12% 4 9% 5% 5% 5% 4 5% 6% 28%	101793
	Night	16% 14% 5% 10% 6% 5% 5% 3 5% 5% 25%	97291
Transparency	Day	56% 6% 12% 19% 7% 1	105292
	Night	60% 5% 11% 16% 7% 1	101882
Seeing	Day	23% 14% 31% 21% 8% 2	15176
	Night	24% 11% 30% 25% 8% 1	24079

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% 21% 9% 14% 5% 8% 6% 4 5% 4 9%	2208
	11th to 20th	Day	10% 15% 7% 18% 9% 5% 6% 4 6% 5% 14%	2210
	21st to end	Day	13% 21% 10% 15% 6% 5% 4 3 5% 5% 14%	2918
February	1st to 10th	Day	8% 16% 6% 11% 8% 9% 7% 5% 6% 7% 16%	1710
	11th to 20th	Day	10% 18% 7% 12% 7% 7% 6% 4 5% 6% 19%	1663
	21st to end	Day	12% 16% 6% 12% 6% 6% 5% 4 5% 5% 22%	1413
March	1st to 10th	Day	19% 15% 4 8% 6% 4 5% 4 4 5% 26%	3345
	11th to 20th	Day	11% 17% 6% 17% 6% 4 4 2 3 4 27%	3480
	21st to end	Day	11% 15% 5% 12% 6% 6% 6% 3 4 5% 27%	3840
April	1st to 10th	Day	18% 16% 4 9% 4 4 5% 3 5% 6% 25%	2280
	11th to 20th	Day	19% 11% 4 10% 5% 3 4 3 4 6% 30%	2398
	21st to end	Day	19% 13% 3 8% 4 4 5% 3 5% 5% 32%	2470
May	1st to 10th	Day	18% 12% 3 8% 5% 4 4 4 6% 7% 30%	4392
	11th to 20th	Day	16% 9% 3 7% 6% 5% 6% 4 6% 7% 34%	4398
	21st to end	Day	17% 9% 3 7% 4 5% 4 4 5% 7% 36%	4928
June	1st to 10th	Day	21% 8% 3 7% 5% 5% 5% 4 5% 7% 29%	2850
	11th to 20th	Day	15% 7% 3 8% 5% 5% 6% 4 6% 8% 35%	2850
	21st to end	Day	18% 8% 3 7% 5% 5% 5% 4 6% 7% 31%	2850
July	1st to 10th	Day	16% 8% 3 7% 6% 5% 5% 4 7% 9% 31%	4760
	11th to 20th	Day	13% 7% 3 7% 5% 5% 5% 4 6% 9% 36%	4760
	21st to end	Day	16% 7% 3 7% 5% 4 4 4 6% 8% 37%	4916
August	1st to 10th	Day	14% 8% 3 7% 5% 6% 6% 5% 7% 8% 32%	4217
	11th to 20th	Day	18% 8% 3 6% 4 4 5% 4 6% 7% 36%	4044
	21st to end	Day	15% 7% 3 7% 4 4 4 4 6% 8% 38%	4441
September	1st to 10th	Day	20% 7% 3 7% 4 5% 4 4 6% 7% 32%	2280
	11th to 20th	Day	21% 8% 3 6% 5% 4 4 4 6% 7% 33%	2222
	21st to end	Day	24% 11% 3 6% 4 3 4 3 4 6% 31%	2021
October	1st to 10th	Day	23% 11% 3 8% 4 4 4 4 4 5% 30%	1900
	11th to 20th	Day	28% 19% 4 7% 4 3 5% 3 4 5% 18%	1900
	21st to end	Day	26% 19% 5% 10% 5% 5% 5% 3 3 4 15%	1963
November	1st to 10th	Day	21% 20% 6% 10% 6% 3 4 3 5% 5% 17%	1518
	11th to 20th	Day	21% 18% 7% 15% 6% 5% 4 3 3 4 13%	1520
	21st to end	Day	25% 22% 8% 14% 7% 4 3 2 4 3 9%	1520
December	1st to 10th	Day	18% 22% 7% 13% 7% 4 5% 3 5% 5% 11%	1506
	11th to 20th	Day	15% 19% 6% 13% 7% 7% 6% 4 4 4 15%	1671
	21st to end	Day	16% 23% 8% 19% 8% 5% 4 3 3 3 9%	2431
January	1st to 10th	Night	12% 17% 8% 17% 9% 8% 5% 3 4 4 13%	4748
	11th to 20th	Night	11% 16% 7% 16% 8% 6% 6% 4 5% 4 16%	4760
	21st to end	Night	11% 20% 9% 14% 8% 8% 6% 3 5% 4 13%	4733
February	1st to 10th	Night	11% 17% 5% 10% 10% 6% 7% 4 5% 6% 19%	2470
	11th to 20th	Night	12% 16% 7% 12% 8% 6% 5% 4 4 5% 22%	2403
	21st to end	Night	10% 17% 6% 13% 7% 8% 6% 3 5% 6% 20%	2041
March	1st to 10th	Night	17% 14% 4 9% 5% 5% 4 3 5% 5% 30%	3493
	11th to 20th	Night	13% 19% 6% 14% 7% 5% 5% 3 4 4 20%	3479
	21st to end	Night	13% 12% 6% 11% 5% 6% 4 3 4 5% 30%	3791
April	1st to 10th	Night	18% 16% 5% 8% 5% 4 4 3 4 4 28%	1900
	11th to 20th	Night	19% 8% 3 7% 6% 5% 4 4 5% 7% 31%	1748
	21st to end	Night	19% 11% 3 9% 4 3 4 3 5% 6% 34%	1710
May	1st to 10th	Night	20% 9% 3 8% 5% 5% 4 3 5% 5% 31%	2546
	11th to 20th	Night	16% 9% 3 6% 3 3 5% 4 6% 8% 37%	2495
	21st to end	Night	19% 6% 2 6% 4 5% 6% 5% 6% 7% 34%	2646
June	1st to 10th	Night	18% 11% 3 8% 5% 4 4 4 5% 7% 31%	1330
	11th to 20th	Night	15% 7% 3 6% 5% 4 5% 3 6% 7% 41%	1330
	21st to end	Night	16% 7% 2 6% 5% 5% 5% 4 5% 7% 38%	1330
July	1st to 10th	Night	17% 7% 3 7% 4 4 4 4 5% 7% 38%	2210
	11th to 20th	Night	15% 7% 3 8% 5% 5% 5% 5% 6% 7% 33%	2210
	21st to end	Night	15% 7% 2 6% 4 4 5% 4 5% 8% 40%	2638
August	1st to 10th	Night	9% 6% 3 7% 6% 5% 5% 4 6% 8% 41%	2697
	11th to 20th	Night	15% 8% 3 7% 5% 4 4 4 5% 7% 39%	2785
	21st to end	Night	16% 7% 3 7% 4 4 3 3 5% 7% 41%	3183
September	1st to 10th	Night	18% 8% 3 7% 4 4 5% 4 5% 6% 37%	1900
	11th to 20th	Night	18% 8% 3 5% 5% 3 4 3 5% 6% 39%	1956
	21st to end	Night	22% 8% 2 6% 4 3 4 3 4 6% 37%	2158
October	1st to 10th	Night	20% 11% 4 7% 5% 4 4 3 4 6% 31%	2280
	11th to 20th	Night	25% 18% 5% 9% 5% 4 4 3 4 4 19%	2280
	21st to end	Night	23% 21% 5% 9% 4 4 4 3 4 5% 18%	2630
November	1st to 10th	Night	20% 17% 5% 10% 5% 5% 4 3 5% 5% 21%	2660
	11th to 20th	Night	21% 17% 6% 13% 7% 5% 4 4 4 4 16%	2660
	21st to end	Night	23% 21% 7% 12% 7% 5% 4 3 4 4 10%	2660
December	1st to 10th	Night	17% 23% 7% 15% 8% 5% 5% 3 3 4 11%	2669
	11th to 20th	Night	17% 19% 7% 13% 9% 6% 5% 4 3 4 13%	3526
	21st to end	Night	19% 20% 10% 17% 8% 4 3 2 3 3 11%	5236

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	78% 3 10% 7% 1	2209
	11th to 20th	Day	70% 5% 8% 13% 4	2210
	21st to end	Day	73% 3 8% 11% 5%	2918
February	1st to 10th	Day	66% 6% 8% 13% 7%	1710
	11th to 20th	Day	67% 4 9% 13% 7%	1672
	21st to end	Day	64% 3 8% 17% 7% 1	1413
March	1st to 10th	Day	61% 5% 8% 18% 7%	3348
	11th to 20th	Day	63% 3 8% 17% 8% 1	3480
	21st to end	Day	59% 5% 8% 18% 8% 2	3840
April	1st to 10th	Day	60% 5% 10% 15% 9% 1	2280
	11th to 20th	Day	56% 4 9% 20% 10% 1	2398
	21st to end	Day	55% 5% 9% 16% 13% 2	2470
May	1st to 10th	Day	51% 9% 10% 20% 9% 1	4406
	11th to 20th	Day	48% 7% 14% 22% 9% 1	4402
	21st to end	Day	47% 6% 11% 19% 15% 2	4928
June	1st to 10th	Day	53% 6% 11% 20% 9% 1	2850
	11th to 20th	Day	46% 6% 11% 23% 13% 1	2850
	21st to end	Day	50% 7% 12% 20% 10% 1	2850
July	1st to 10th	Day	48% 7% 16% 23% 6%	4686
	11th to 20th	Day	43% 7% 18% 24% 9%	4679
	21st to end	Day	45% 5% 13% 30% 6%	4760
August	1st to 10th	Day	47% 8% 16% 24% 5%	4203
	11th to 20th	Day	47% 6% 15% 23% 8% 1	4083
	21st to end	Day	43% 6% 14% 28% 9% 1	4441
September	1st to 10th	Day	49% 8% 14% 21% 8% 1	2280
	11th to 20th	Day	49% 7% 18% 22% 4	2222
	21st to end	Day	55% 4 12% 21% 7%	2021
October	1st to 10th	Day	60% 5% 11% 18% 5% 1	3160
	11th to 20th	Day	61% 5% 12% 16% 5%	3140
	21st to end	Day	69% 5% 14% 6% 5%	3217
November	1st to 10th	Day	71% 4 13% 8% 4	1518
	11th to 20th	Day	76% 4 9% 8% 2	1520
	21st to end	Day	83% 4 8% 4 2	1520
December	1st to 10th	Day	76% 3 10% 9% 2	1506
	11th to 20th	Day	71% 5% 6% 14% 2	1671
	21st to end	Day	80% 5% 6% 7% 1	2431
January	1st to 10th	Night	75% 4 13% 6% 1	4748
	11th to 20th	Night	70% 5% 8% 13% 4	4760
	21st to end	Night	75% 4 6% 10% 5%	4733
February	1st to 10th	Night	65% 4 9% 14% 8%	2470
	11th to 20th	Night	65% 5% 9% 15% 7%	2405
	21st to end	Night	66% 4 8% 14% 8% 1	2041
March	1st to 10th	Night	57% 4 10% 15% 12% 2	3503
	11th to 20th	Night	68% 5% 8% 12% 5% 1	3480
	21st to end	Night	55% 6% 8% 15% 13% 3	3791
April	1st to 10th	Night	59% 4 8% 16% 12% 1	1900
	11th to 20th	Night	51% 5% 10% 20% 13% 1	1748
	21st to end	Night	52% 5% 7% 17% 17% 3	1710
May	1st to 10th	Night	52% 8% 11% 16% 12% 2	2552
	11th to 20th	Night	43% 7% 15% 23% 12% 1	2496
	21st to end	Night	46% 8% 13% 18% 13% 2	2647
June	1st to 10th	Night	53% 6% 9% 20% 11% 1	1330
	11th to 20th	Night	41% 7% 10% 24% 16% 3	1330
	21st to end	Night	44% 6% 14% 22% 13% 1	1330
July	1st to 10th	Night	44% 6% 14% 28% 8%	2175
	11th to 20th	Night	47% 6% 17% 21% 8% 1	2168
	21st to end	Night	42% 6% 14% 30% 7%	2554
August	1st to 10th	Night	40% 6% 16% 31% 6%	2687
	11th to 20th	Night	44% 6% 16% 29% 5%	2812
	21st to end	Night	43% 6% 15% 25% 9% 2	3183
September	1st to 10th	Night	47% 7% 16% 21% 8% 1	1900
	11th to 20th	Night	45% 7% 19% 23% 6%	1956
	21st to end	Night	47% 6% 15% 24% 7%	2158
October	1st to 10th	Night	54% 5% 12% 21% 8%	3800
	11th to 20th	Night	62% 4 11% 20% 3	3779
	21st to end	Night	63% 5% 15% 10% 5%	4326
November	1st to 10th	Night	66% 5% 14% 12% 3	2660
	11th to 20th	Night	72% 5% 11% 9% 3	2660
	21st to end	Night	80% 5% 8% 7% 1	2660
December	1st to 10th	Night	79% 4 8% 8% 2	2669
	11th to 20th	Night	75% 4 8% 10% 3	3525
	21st to end	Night	80% 3 6% 8% 3	5236

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	26% 22% 36% 13% 3 1	180
	11th to 20th	Day	14% 18% 38% 22% 6% 2	180
	21st to end	Day	20% 11% 35% 25% 8% 1	257
February	1st to 10th	Day	15% 26% 37% 17% 4 1	270
	11th to 20th	Day	19% 19% 39% 17% 6%	270
	21st to end	Day	24% 24% 39% 12% 1	225
March	1st to 10th	Day	21% 14% 42% 16% 7%	446
	11th to 20th	Day	21% 17% 34% 21% 7%	460
	21st to end	Day	25% 17% 34% 17% 6% 1	506
April	1st to 10th	Day	23% 20% 28% 18% 8% 2	460
	11th to 20th	Day	26% 17% 28% 21% 7% 2	452
	21st to end	Day	27% 19% 26% 18% 8% 2	460
May	1st to 10th	Day	21% 15% 33% 20% 9% 2	463
	11th to 20th	Day	24% 14% 31% 19% 8% 3	487
	21st to end	Day	23% 15% 31% 23% 8% 1	581
June	1st to 10th	Day	23% 12% 36% 22% 7% 1	680
	11th to 20th	Day	19% 18% 31% 22% 8% 2	680
	21st to end	Day	20% 11% 29% 27% 10% 3	680
July	1st to 10th	Day	16% 12% 33% 28% 9% 2	671
	11th to 20th	Day	16% 10% 32% 27% 14% 1	668
	21st to end	Day	15% 8% 32% 28% 12% 4	595
August	1st to 10th	Day	17% 10% 27% 29% 11% 5%	486
	11th to 20th	Day	18% 8% 24% 27% 16% 7%	479
	21st to end	Day	22% 11% 28% 19% 14% 6%	539
September	1st to 10th	Day	22% 10% 32% 22% 11% 3	490
	11th to 20th	Day	22% 9% 29% 25% 10% 4	490
	21st to end	Day	29% 10% 26% 21% 12% 2	490
October	1st to 10th	Day	28% 14% 29% 17% 9% 2	490
	11th to 20th	Day	35% 18% 28% 15% 3 1	490
	21st to end	Day	36% 14% 31% 15% 3 1	445
November	1st to 10th	Day	33% 20% 36% 8% 3	188
	11th to 20th	Day	23% 26% 28% 21% 2 1	180
	21st to end	Day	42% 16% 31% 7% 2 2	180
December	1st to 10th	Day	29% 14% 31% 16% 9% 1	180
	11th to 20th	Day	24% 16% 40% 16% 4 1	180
	21st to end	Day	32% 13% 34% 15% 6% 1	198
January	1st to 10th	Night	24% 14% 35% 22% 5% 1	950
	11th to 20th	Night	25% 11% 35% 23% 7%	950
	21st to end	Night	18% 10% 28% 30% 12% 2	865
February	1st to 10th	Night	19% 13% 35% 26% 6%	760
	11th to 20th	Night	21% 13% 34% 27% 5%	743
	21st to end	Night	19% 17% 37% 22% 6%	628
March	1st to 10th	Night	19% 17% 33% 23% 7% 1	760
	11th to 20th	Night	25% 16% 30% 24% 5% 1	760
	21st to end	Night	20% 12% 36% 25% 6% 1	836
April	1st to 10th	Night	27% 13% 30% 22% 7% 1	760
	11th to 20th	Night	24% 15% 28% 26% 7%	624
	21st to end	Night	23% 10% 31% 28% 7% 1	570
May	1st to 10th	Night	21% 9% 32% 28% 10%	399
	11th to 20th	Night	23% 9% 28% 30% 7% 2	374
	21st to end	Night	22% 8% 30% 34% 5%	411
June	1st to 10th	Night	22% 8% 33% 28% 8%	380
	11th to 20th	Night	18% 9% 30% 32% 10%	380
	21st to end	Night	17% 7% 27% 34% 15%	380
July	1st to 10th	Night	17% 7% 25% 38% 11% 1	370
	11th to 20th	Night	18% 4 28% 39% 11% 1	368
	21st to end	Night	13% 6% 26% 37% 16% 1	416
August	1st to 10th	Night	17% 4 27% 31% 20% 1	491
	11th to 20th	Night	17% 6% 23% 31% 20% 3	564
	21st to end	Night	23% 7% 25% 29% 16% 2	660
September	1st to 10th	Night	21% 9% 29% 27% 13% 1	760
	11th to 20th	Night	22% 9% 26% 28% 15% 1	760
	21st to end	Night	25% 9% 22% 30% 12% 1	760
October	1st to 10th	Night	27% 12% 26% 26% 9% 1	760
	11th to 20th	Night	36% 13% 27% 17% 6% 1	760
	21st to end	Night	33% 12% 31% 19% 4 1	836
November	1st to 10th	Night	29% 12% 34% 19% 6% 1	760
	11th to 20th	Night	30% 15% 31% 18% 5% 1	760
	21st to end	Night	35% 13% 33% 14% 4 1	760
December	1st to 10th	Night	30% 13% 29% 20% 7% 1	769
	11th to 20th	Night	28% 13% 31% 21% 6% 1	950
	21st to end	Night	29% 14% 27% 22% 7% 2	1045

Page generated at 2024-11-03 02:11:26. Version ac07

Copyright © 2024 Attilla Danko.