Papineau Regional County Municipality
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Papineau Regional County Municipality clear sky chart from 2005-11-06 to 2025-02-25.

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 9% 5% 5% 4 4 5% 7% 31%	108705
	Night	16% 12% 4 9% 5% 4 4 3 5% 6% 31%	109967
Transparency	Day	52% 6% 12% 20% 9% 1	112194
	Night	54% 5% 12% 18% 10% 1	114630
Seeing	Day	24% 16% 30% 20% 8% 2	14745
	Night	23% 13% 29% 25% 10% 1	23944

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	13% 19% 6% 16% 8% 6% 5% 2 4 4 18%	3597
	11th to 20th	Day	11% 16% 7% 16% 8% 5% 4 3 4 5% 20%	3570
	21st to end	Day	9% 16% 7% 14% 6% 6% 5% 4 5% 5% 22%	4024
February	1st to 10th	Day	12% 17% 6% 14% 7% 5% 4 3 5% 5% 23%	1800
	11th to 20th	Day	13% 17% 5% 13% 7% 5% 4 3 4 5% 26%	1782
	21st to end	Day	18% 16% 5% 9% 6% 6% 3 3 5% 4 25%	1610
March	1st to 10th	Day	18% 17% 4 9% 6% 4 4 3 4 5% 25%	3116
	11th to 20th	Day	12% 17% 6% 11% 6% 5% 5% 4 4 5% 25%	3411
	21st to end	Day	14% 9% 3 7% 6% 4 5% 3 5% 7% 39%	4069
April	1st to 10th	Day	21% 13% 4 8% 4 4 3 3 4 5% 31%	2280
	11th to 20th	Day	22% 9% 3 7% 5% 3 3 3 5% 5% 34%	2254
	21st to end	Day	22% 11% 3 8% 4 5% 4 4 4 4 31%	2429
May	1st to 10th	Day	21% 10% 3 8% 5% 5% 4 4 6% 6% 28%	4426
	11th to 20th	Day	19% 8% 3 7% 4 4 4 4 6% 8% 32%	4398
	21st to end	Day	17% 7% 3 7% 5% 5% 5% 4 5% 8% 35%	4837
June	1st to 10th	Day	23% 8% 3 7% 5% 5% 4 3 5% 7% 28%	2660
	11th to 20th	Day	15% 6% 3 6% 5% 5% 5% 4 6% 9% 36%	2660
	21st to end	Day	21% 7% 2 7% 5% 5% 6% 4 7% 7% 29%	2660
July	1st to 10th	Day	13% 6% 3 7% 6% 5% 5% 5% 7% 9% 33%	4440
	11th to 20th	Day	15% 6% 2 7% 5% 5% 5% 5% 7% 8% 34%	4440
	21st to end	Day	12% 6% 2 6% 4 4 5% 3 5% 8% 46%	4814
August	1st to 10th	Day	15% 6% 2 8% 6% 5% 5% 4 7% 9% 33%	4423
	11th to 20th	Day	15% 6% 3 6% 4 4 5% 4 7% 9% 37%	3988
	21st to end	Day	15% 5% 2 6% 4 5% 5% 4 7% 9% 38%	4180
September	1st to 10th	Day	15% 6% 2 6% 4 4 5% 4 5% 6% 42%	2280
	11th to 20th	Day	15% 5% 2 5% 4 4 4 3 5% 8% 46%	2256
	21st to end	Day	20% 7% 2 5% 5% 3 3 3 5% 7% 40%	2065
October	1st to 10th	Day	23% 7% 3 6% 5% 4 4 3 5% 6% 34%	1900
	11th to 20th	Day	24% 10% 3 8% 5% 4 4 4 4 7% 26%	1900
	21st to end	Day	25% 11% 4 8% 4 5% 4 4 4 5% 27%	1899
November	1st to 10th	Day	16% 10% 3 9% 4 5% 4 3 5% 7% 33%	1761
	11th to 20th	Day	19% 14% 4 9% 5% 5% 5% 3 5% 5% 26%	1630
	21st to end	Day	22% 15% 5% 9% 5% 5% 4 4 4 5% 21%	1600
December	1st to 10th	Day	20% 21% 7% 12% 5% 4 4 3 5% 5% 14%	2600
	11th to 20th	Day	16% 18% 7% 11% 5% 4 4 3 3 5% 23%	2986
	21st to end	Day	21% 19% 5% 8% 5% 4 4 4 3 4 22%	3960
January	1st to 10th	Night	13% 20% 8% 14% 5% 4 4 2 4 5% 21%	6349
	11th to 20th	Night	10% 16% 7% 16% 8% 5% 4 3 4 5% 21%	6315
	21st to end	Night	11% 15% 7% 14% 6% 7% 5% 3 4 5% 22%	6930
February	1st to 10th	Night	12% 14% 5% 12% 7% 6% 5% 4 5% 5% 25%	2600
	11th to 20th	Night	12% 14% 6% 12% 7% 5% 4 3 4 5% 28%	2503
	21st to end	Night	14% 14% 5% 11% 6% 5% 4 4 4 5% 28%	1939
March	1st to 10th	Night	19% 14% 4 8% 5% 4 4 2 4 4 31%	3724
	11th to 20th	Night	15% 19% 4 9% 5% 4 4 3 4 5% 27%	3544
	21st to end	Night	15% 10% 3 9% 5% 4 4 3 5% 5% 38%	3562
April	1st to 10th	Night	21% 11% 2 6% 6% 5% 4 3 5% 6% 32%	1900
	11th to 20th	Night	20% 9% 3 6% 5% 4 3 4 5% 6% 35%	1875
	21st to end	Night	20% 10% 3 8% 4 3 4 3 4 6% 34%	1767
May	1st to 10th	Night	19% 10% 3 8% 5% 5% 5% 3 5% 6% 29%	2514
	11th to 20th	Night	19% 7% 3 7% 4 4 4 4 5% 6% 37%	2495
	21st to end	Night	16% 7% 3 8% 5% 5% 5% 4 6% 7% 36%	2738
June	1st to 10th	Night	16% 8% 3 7% 4 4 6% 5% 7% 8% 32%	1520
	11th to 20th	Night	14% 8% 3 6% 4 3 5% 3 6% 7% 41%	1520
	21st to end	Night	19% 8% 3 6% 4 4 4 4 6% 6% 37%	1520
July	1st to 10th	Night	12% 7% 2 8% 6% 5% 6% 5% 6% 7% 37%	2520
	11th to 20th	Night	15% 6% 3 5% 4 4 3 4 6% 8% 42%	2520
	21st to end	Night	11% 5% 2 5% 4 4 5% 4 6% 8% 47%	2739
August	1st to 10th	Night	12% 6% 3 8% 4 4 6% 4 6% 8% 39%	2506
	11th to 20th	Night	16% 7% 2 6% 3 4 4 3 5% 7% 43%	2806
	21st to end	Night	14% 7% 2 7% 4 4 4 4 6% 6% 43%	3476
September	1st to 10th	Night	13% 5% 2 5% 4 5% 4 3 6% 6% 47%	1900
	11th to 20th	Night	15% 4 3 4 3 3 4 3 6% 6% 49%	1924
	21st to end	Night	17% 6% 2 5% 4 3 3 3 5% 7% 44%	2113
October	1st to 10th	Night	19% 8% 3 6% 4 4 4 3 6% 6% 38%	2280
	11th to 20th	Night	21% 9% 3 7% 5% 5% 4 4 5% 6% 32%	2280
	21st to end	Night	23% 10% 4 8% 5% 4 4 3 4 6% 29%	2698
November	1st to 10th	Night	19% 11% 4 7% 5% 5% 5% 3 5% 6% 32%	2537
	11th to 20th	Night	19% 12% 4 8% 5% 5% 4 3 6% 5% 29%	2769
	21st to end	Night	20% 14% 5% 10% 6% 4 5% 4 5% 6% 22%	2800
December	1st to 10th	Night	18% 16% 5% 11% 6% 6% 5% 4 5% 6% 18%	4580
	11th to 20th	Night	24% 13% 4 10% 5% 4 4 3 4 4 26%	5208
	21st to end	Night	22% 22% 4 8% 4 4 3 3 3 4 23%	6996

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% 5% 7% 13% 4	3598
	11th to 20th	Day	67% 4 8% 12% 8% 1	3600
	21st to end	Day	64% 5% 9% 11% 10% 1	4024
February	1st to 10th	Day	63% 4 8% 16% 7% 2	1800
	11th to 20th	Day	61% 5% 10% 14% 9% 1	1791
	21st to end	Day	62% 4 9% 13% 9% 1	1610
March	1st to 10th	Day	60% 7% 7% 15% 9% 1	3119
	11th to 20th	Day	59% 6% 12% 12% 9% 2	3411
	21st to end	Day	44% 5% 10% 20% 18% 2	4069
April	1st to 10th	Day	55% 3 9% 18% 11% 3	2280
	11th to 20th	Day	52% 5% 8% 19% 14% 2	2254
	21st to end	Day	55% 5% 8% 15% 12% 4	2429
May	1st to 10th	Day	52% 8% 9% 20% 9% 2	4440
	11th to 20th	Day	47% 8% 17% 18% 9% 1	4402
	21st to end	Day	45% 7% 12% 20% 15% 1	4837
June	1st to 10th	Day	54% 7% 11% 17% 11% 1	2660
	11th to 20th	Day	44% 7% 13% 22% 11% 3	2660
	21st to end	Day	51% 8% 13% 17% 9% 1	2660
July	1st to 10th	Day	45% 6% 16% 24% 9%	4370
	11th to 20th	Day	45% 6% 16% 26% 7%	4365
	21st to end	Day	38% 6% 15% 31% 10%	4661
August	1st to 10th	Day	49% 5% 17% 22% 7%	4409
	11th to 20th	Day	43% 6% 16% 28% 7%	4028
	21st to end	Day	43% 4 18% 22% 12% 1	4180
September	1st to 10th	Day	40% 7% 14% 27% 13%	2280
	11th to 20th	Day	37% 6% 14% 30% 11% 1	2256
	21st to end	Day	43% 6% 15% 26% 10%	2065
October	1st to 10th	Day	50% 4 11% 27% 7%	3160
	11th to 20th	Day	49% 7% 14% 23% 7%	3140
	21st to end	Day	50% 5% 20% 18% 6%	3099
November	1st to 10th	Day	49% 6% 16% 21% 6% 1	1761
	11th to 20th	Day	60% 7% 11% 12% 9% 1	1630
	21st to end	Day	66% 6% 12% 11% 5% 1	1600
December	1st to 10th	Day	73% 4 10% 11% 2	2600
	11th to 20th	Day	66% 5% 8% 15% 6%	2986
	21st to end	Day	66% 4 8% 16% 6%	3960
January	1st to 10th	Night	68% 5% 12% 12% 4	6349
	11th to 20th	Night	65% 7% 10% 12% 5%	6360
	21st to end	Night	65% 5% 8% 9% 12% 1	6930
February	1st to 10th	Night	60% 5% 10% 17% 7% 1	2600
	11th to 20th	Night	59% 4 10% 18% 8% 1	2505
	21st to end	Night	57% 5% 9% 17% 11% 1	1939
March	1st to 10th	Night	57% 5% 10% 16% 10% 3	3734
	11th to 20th	Night	57% 6% 12% 15% 9% 2	3545
	21st to end	Night	48% 5% 8% 21% 15% 3	3562
April	1st to 10th	Night	53% 5% 9% 17% 13% 2	1900
	11th to 20th	Night	49% 6% 8% 22% 15% 1	1875
	21st to end	Night	51% 5% 10% 17% 14% 3	1767
May	1st to 10th	Night	52% 7% 11% 18% 10% 2	2520
	11th to 20th	Night	45% 8% 14% 18% 13% 2	2496
	21st to end	Night	47% 7% 10% 20% 15% 2	2739
June	1st to 10th	Night	46% 8% 13% 22% 10%	1520
	11th to 20th	Night	42% 7% 12% 23% 14% 2	1520
	21st to end	Night	48% 8% 12% 19% 13% 1	1520
July	1st to 10th	Night	46% 5% 18% 20% 11% 1	2480
	11th to 20th	Night	41% 5% 17% 30% 7%	2472
	21st to end	Night	36% 6% 18% 27% 14%	2651
August	1st to 10th	Night	43% 6% 16% 27% 8%	2496
	11th to 20th	Night	42% 5% 17% 29% 7%	2832
	21st to end	Night	42% 6% 16% 23% 12% 2	3476
September	1st to 10th	Night	37% 7% 14% 28% 13% 1	1900
	11th to 20th	Night	35% 6% 15% 34% 10% 1	1924
	21st to end	Night	40% 6% 13% 30% 11%	2113
October	1st to 10th	Night	43% 4 14% 27% 11%	3800
	11th to 20th	Night	45% 5% 15% 26% 9%	3779
	21st to end	Night	49% 5% 19% 17% 10%	4436
November	1st to 10th	Night	53% 6% 14% 19% 7%	2537
	11th to 20th	Night	55% 7% 12% 15% 10% 1	2769
	21st to end	Night	63% 6% 12% 15% 4	2800
December	1st to 10th	Night	68% 4 14% 11% 3	4580
	11th to 20th	Night	64% 4 6% 15% 11% 1	5208
	21st to end	Night	66% 4 5% 13% 11%	6996

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	27% 17% 34% 20% 4	200
	11th to 20th	Day	27% 20% 36% 12% 6% 1	200
	21st to end	Day	21% 18% 36% 19% 5%	233
February	1st to 10th	Day	32% 24% 31% 11% 2	300
	11th to 20th	Day	29% 28% 33% 11%	329
	21st to end	Day	29% 19% 34% 15% 2	398
March	1st to 10th	Day	26% 20% 30% 18% 5%	460
	11th to 20th	Day	27% 21% 34% 14% 3 1	460
	21st to end	Day	32% 19% 26% 15% 7% 1	506
April	1st to 10th	Day	31% 17% 31% 14% 6% 1	460
	11th to 20th	Day	33% 21% 22% 15% 8% 1	452
	21st to end	Day	30% 20% 32% 12% 5% 2	460
May	1st to 10th	Day	27% 14% 34% 16% 6% 2	463
	11th to 20th	Day	22% 17% 30% 20% 9% 2	487
	21st to end	Day	23% 15% 33% 19% 8% 2	529
June	1st to 10th	Day	26% 12% 31% 23% 8% 1	490
	11th to 20th	Day	19% 17% 31% 22% 10% 2	490
	21st to end	Day	25% 13% 28% 23% 10% 2	490
July	1st to 10th	Day	15% 10% 32% 29% 10% 4	485
	11th to 20th	Day	13% 11% 36% 25% 13% 3	484
	21st to end	Day	14% 8% 35% 30% 12% 2	532
August	1st to 10th	Day	16% 7% 27% 36% 12% 2	486
	11th to 20th	Day	14% 9% 23% 31% 14% 8%	479
	21st to end	Day	18% 11% 29% 23% 13% 6%	539
September	1st to 10th	Day	18% 11% 29% 22% 13% 6%	490
	11th to 20th	Day	14% 11% 22% 24% 19% 9%	490
	21st to end	Day	21% 14% 27% 21% 13% 4	490
October	1st to 10th	Day	27% 15% 22% 20% 13% 3	490
	11th to 20th	Day	29% 21% 27% 16% 7% 1	490
	21st to end	Day	33% 16% 30% 18% 4	438
November	1st to 10th	Day	28% 17% 29% 19% 6% 1	395
	11th to 20th	Day	29% 18% 35% 13% 4 1	230
	21st to end	Day	34% 19% 31% 13% 3 1	200
December	1st to 10th	Day	31% 14% 33% 19% 3	200
	11th to 20th	Day	28% 19% 38% 12% 3	200
	21st to end	Day	33% 20% 31% 11% 3 1	220
January	1st to 10th	Night	27% 16% 35% 18% 4	800
	11th to 20th	Night	28% 16% 30% 21% 6%	800
	21st to end	Night	20% 13% 36% 24% 6% 1	880
February	1st to 10th	Night	20% 17% 36% 23% 4	800
	11th to 20th	Night	21% 20% 36% 20% 3 1	783
	21st to end	Night	22% 18% 29% 27% 3	647
March	1st to 10th	Night	24% 15% 33% 22% 5%	760
	11th to 20th	Night	26% 17% 31% 21% 5% 1	760
	21st to end	Night	24% 14% 32% 21% 8%	836
April	1st to 10th	Night	29% 15% 27% 25% 4	760
	11th to 20th	Night	26% 17% 29% 21% 7% 1	751
	21st to end	Night	26% 14% 30% 22% 7% 1	627
May	1st to 10th	Night	24% 12% 27% 26% 8% 2	380
	11th to 20th	Night	22% 10% 26% 32% 9%	374
	21st to end	Night	17% 9% 36% 27% 11%	411
June	1st to 10th	Night	17% 7% 29% 37% 9%	380
	11th to 20th	Night	19% 8% 24% 36% 12% 1	380
	21st to end	Night	21% 6% 25% 33% 14% 1	380
July	1st to 10th	Night	10% 6% 29% 39% 16%	370
	11th to 20th	Night	14% 4 20% 43% 19% 1	368
	21st to end	Night	11% 5% 25% 41% 16% 2	416
August	1st to 10th	Night	14% 4 16% 44% 21% 1	378
	11th to 20th	Night	14% 4 19% 34% 27% 3	571
	21st to end	Night	16% 7% 23% 33% 19% 2	836
September	1st to 10th	Night	16% 6% 27% 33% 18% 1	760
	11th to 20th	Night	18% 8% 19% 29% 23% 3	760
	21st to end	Night	20% 7% 26% 27% 18% 2	760
October	1st to 10th	Night	23% 10% 26% 25% 15% 1	760
	11th to 20th	Night	26% 12% 27% 25% 9% 1	760
	21st to end	Night	28% 12% 31% 24% 5%	836
November	1st to 10th	Night	27% 13% 25% 25% 8% 1	780
	11th to 20th	Night	27% 15% 30% 17% 11% 1	800
	21st to end	Night	29% 18% 27% 21% 5%	800
December	1st to 10th	Night	29% 16% 31% 19% 4	800
	11th to 20th	Night	30% 16% 30% 18% 5% 1	800
	21st to end	Night	35% 14% 29% 18% 4	880

Page generated at 2025-02-22 06:51:34. Version ac07

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