Campement Péribonka
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Campement Péribonka clear sky chart from 2005-11-06 to 2024-01-16.

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	19% 13% 5% 9% 7% 4 5% 5% 5% 6% 23%	74593
	Night	17% 13% 6% 10% 7% 4 5% 5% 5% 5% 23%	75221
Transparency	Day	62% 6% 10% 14% 7% 1	74286
	Night	63% 6% 10% 14% 6% 1	75063
Seeing	Day	25% 15% 30% 19% 9% 2	14327
	Night	24% 13% 29% 25% 9% 1	22673

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	11% 19% 9% 16% 9% 4 6% 6% 4 3 13%	1360
	11th to 20th	Day	11% 17% 7% 13% 9% 4 6% 6% 6% 5% 15%	1486
	21st to end	Day	9% 12% 6% 11% 10% 4 8% 6% 7% 6% 21%	1584
February	1st to 10th	Day	6% 11% 7% 10% 11% 8% 9% 7% 6% 5% 20%	1440
	11th to 20th	Day	10% 17% 6% 14% 11% 6% 6% 6% 5% 4 16%	1610
	21st to end	Day	8% 14% 7% 11% 11% 5% 7% 7% 5% 7% 20%	1480
March	1st to 10th	Day	11% 14% 7% 13% 8% 5% 6% 6% 5% 4 21%	1797
	11th to 20th	Day	14% 14% 7% 11% 9% 6% 6% 4 4 4 21%	1885
	21st to end	Day	14% 17% 7% 10% 6% 3 4 4 4 5% 27%	2314
April	1st to 10th	Day	18% 17% 6% 10% 8% 4 4 4 5% 5% 19%	2160
	11th to 20th	Day	16% 14% 4 8% 5% 3 5% 5% 5% 7% 28%	2264
	21st to end	Day	20% 13% 5% 7% 6% 3 4 5% 4 5% 28%	2340
May	1st to 10th	Day	23% 11% 4 6% 6% 3 4 5% 4 6% 27%	2487
	11th to 20th	Day	18% 8% 3 7% 6% 4 5% 5% 5% 6% 33%	2511
	21st to end	Day	21% 8% 3 6% 5% 3 5% 5% 5% 7% 31%	2919
June	1st to 10th	Day	23% 9% 3 7% 6% 4 5% 5% 5% 6% 29%	2700
	11th to 20th	Day	18% 7% 3 7% 7% 4 5% 6% 5% 8% 30%	2700
	21st to end	Day	25% 8% 3 7% 6% 3 5% 4 5% 7% 26%	2700
July	1st to 10th	Day	24% 8% 3 6% 6% 4 6% 6% 6% 7% 23%	2700
	11th to 20th	Day	20% 8% 4 6% 6% 4 5% 5% 5% 10% 27%	2620
	21st to end	Day	19% 9% 4 7% 7% 5% 6% 5% 6% 7% 24%	2744
August	1st to 10th	Day	22% 11% 4 8% 7% 5% 6% 6% 6% 6% 19%	2506
	11th to 20th	Day	23% 9% 3 6% 6% 4 4 5% 5% 7% 26%	2359
	21st to end	Day	22% 10% 3 7% 7% 4 5% 5% 5% 6% 27%	2531
September	1st to 10th	Day	23% 10% 3 7% 5% 3 4 4 5% 6% 30%	2160
	11th to 20th	Day	25% 10% 3 6% 7% 3 4 4 5% 6% 28%	2012
	21st to end	Day	26% 12% 3 7% 6% 3 4 4 4 4 27%	1980
October	1st to 10th	Day	23% 13% 4 7% 5% 2 5% 4 5% 6% 26%	1945
	11th to 20th	Day	31% 18% 5% 7% 6% 3 4 4 4 4 13%	1620
	21st to end	Day	28% 20% 6% 8% 5% 3 3 3 3 4 16%	1782
November	1st to 10th	Day	23% 19% 7% 11% 6% 3 4 3 2 3 16%	1671
	11th to 20th	Day	22% 20% 9% 12% 8% 4 3 3 3 5% 11%	1467
	21st to end	Day	20% 22% 10% 12% 8% 3 4 3 3 5% 11%	1330
December	1st to 10th	Day	17% 18% 8% 15% 10% 6% 7% 4 3 3 11%	1330
	11th to 20th	Day	16% 18% 6% 14% 9% 4 6% 4 3 4 16%	1668
	21st to end	Day	12% 17% 8% 12% 9% 6% 6% 4 5% 6% 15%	2431
January	1st to 10th	Night	11% 19% 8% 14% 10% 6% 6% 5% 4 4 13%	2800
	11th to 20th	Night	13% 14% 7% 13% 9% 6% 5% 5% 6% 6% 17%	2602
	21st to end	Night	8% 12% 6% 10% 9% 7% 9% 8% 6% 6% 19%	2772
February	1st to 10th	Night	8% 10% 5% 12% 10% 5% 9% 6% 6% 5% 22%	2520
	11th to 20th	Night	8% 15% 8% 13% 8% 4 7% 8% 6% 5% 18%	2233
	21st to end	Night	9% 12% 8% 13% 10% 5% 7% 7% 5% 5% 20%	1776
March	1st to 10th	Night	9% 14% 6% 12% 8% 5% 7% 5% 5% 5% 24%	2150
	11th to 20th	Night	14% 15% 7% 10% 8% 4 6% 4 4 5% 23%	2074
	21st to end	Night	11% 17% 6% 11% 6% 3 4 3 4 6% 28%	2039
April	1st to 10th	Night	20% 14% 6% 9% 8% 4 5% 4 2 5% 22%	1800
	11th to 20th	Night	17% 12% 4 8% 6% 3 4 3 5% 7% 31%	1644
	21st to end	Night	19% 11% 4 7% 5% 3 4 5% 4 7% 31%	1620
May	1st to 10th	Night	21% 12% 5% 7% 6% 3 5% 3 3 6% 29%	1490
	11th to 20th	Night	19% 9% 4 6% 6% 3 5% 4 3 6% 37%	1380
	21st to end	Night	22% 9% 3 5% 6% 4 4 4 5% 6% 31%	1356
June	1st to 10th	Night	20% 8% 4 5% 6% 3 5% 6% 7% 6% 30%	1260
	11th to 20th	Night	16% 9% 4 7% 7% 4 4 5% 5% 7% 33%	1260
	21st to end	Night	19% 10% 3 7% 6% 3 5% 5% 5% 6% 31%	1260
July	1st to 10th	Night	20% 8% 4 7% 5% 4 4 5% 7% 7% 29%	1260
	11th to 20th	Night	16% 6% 3 8% 7% 4 7% 5% 6% 7% 31%	1336
	21st to end	Night	18% 8% 4 7% 5% 4 6% 6% 6% 7% 29%	1574
August	1st to 10th	Night	19% 9% 3 7% 6% 4 4 6% 6% 8% 28%	1432
	11th to 20th	Night	18% 8% 4 6% 7% 3 4 5% 5% 7% 32%	1523
	21st to end	Night	21% 7% 3 6% 6% 3 5% 5% 6% 7% 30%	1822
September	1st to 10th	Night	21% 7% 3 6% 5% 3 5% 4 4 6% 36%	1800
	11th to 20th	Night	23% 9% 3 6% 6% 3 4 5% 5% 5% 31%	1948
	21st to end	Night	22% 8% 3 6% 6% 3 4 4 4 6% 34%	1980
October	1st to 10th	Night	20% 10% 3 6% 6% 3 4 4 5% 6% 33%	2012
	11th to 20th	Night	29% 14% 5% 7% 7% 3 4 3 3 4 21%	2340
	21st to end	Night	28% 15% 5% 9% 7% 3 4 4 5% 4 17%	2574
November	1st to 10th	Night	24% 18% 7% 11% 6% 3 4 3 4 4 16%	2407
	11th to 20th	Night	19% 17% 8% 13% 8% 3 4 4 3 4 16%	2710
	21st to end	Night	19% 20% 8% 15% 8% 4 4 4 3 4 11%	2850
December	1st to 10th	Night	17% 16% 8% 12% 10% 5% 5% 5% 4 5% 12%	2850
	11th to 20th	Night	18% 17% 6% 13% 10% 5% 6% 5% 4 5% 13%	3531
	21st to end	Night	13% 20% 8% 12% 8% 4 5% 4 4 5% 16%	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	75% 5% 7% 11% 3	1361
	11th to 20th	Day	70% 4 8% 10% 7% 1	1486
	21st to end	Day	62% 4 7% 16% 10% 1	1584
February	1st to 10th	Day	63% 5% 8% 13% 10% 1	1440
	11th to 20th	Day	69% 6% 9% 11% 5%	1618
	21st to end	Day	62% 5% 9% 16% 8%	1480
March	1st to 10th	Day	65% 4 8% 13% 9% 1	1800
	11th to 20th	Day	67% 5% 7% 11% 10%	1885
	21st to end	Day	62% 3 9% 15% 9% 1	2314
April	1st to 10th	Day	68% 4 7% 11% 8% 1	2160
	11th to 20th	Day	55% 6% 10% 19% 9% 1	2264
	21st to end	Day	58% 5% 8% 16% 12% 1	2340
May	1st to 10th	Day	58% 5% 9% 15% 11% 1	2487
	11th to 20th	Day	50% 6% 11% 18% 13% 2	2515
	21st to end	Day	53% 6% 10% 19% 12% 1	2919
June	1st to 10th	Day	56% 6% 9% 16% 13% 2	2700
	11th to 20th	Day	52% 6% 11% 18% 11% 2	2700
	21st to end	Day	57% 7% 11% 15% 9%	2700
July	1st to 10th	Day	57% 8% 13% 18% 4	2625
	11th to 20th	Day	53% 8% 15% 18% 6%	2539
	21st to end	Day	59% 9% 14% 16% 3	2591
August	1st to 10th	Day	63% 9% 15% 11% 1	2492
	11th to 20th	Day	56% 9% 15% 15% 5%	2359
	21st to end	Day	58% 8% 13% 18% 3	2531
September	1st to 10th	Day	54% 7% 14% 19% 7%	2160
	11th to 20th	Day	57% 7% 15% 17% 4	2012
	21st to end	Day	61% 7% 11% 16% 5%	1980
October	1st to 10th	Day	59% 6% 14% 13% 7% 1	1945
	11th to 20th	Day	76% 5% 10% 8% 2	1620
	21st to end	Day	74% 5% 9% 8% 4 1	1782
November	1st to 10th	Day	75% 4 11% 7% 3	1671
	11th to 20th	Day	78% 5% 8% 7% 1	1467
	21st to end	Day	78% 5% 9% 8% 1	1330
December	1st to 10th	Day	81% 4 7% 6% 1	1330
	11th to 20th	Day	72% 5% 7% 12% 4	1668
	21st to end	Day	68% 7% 7% 9% 7% 1	2431
January	1st to 10th	Night	74% 4 8% 10% 3	2800
	11th to 20th	Night	67% 5% 8% 13% 6% 1	2602
	21st to end	Night	63% 5% 9% 17% 6%	2772
February	1st to 10th	Night	62% 4 11% 15% 8%	2520
	11th to 20th	Night	66% 6% 10% 13% 5%	2236
	21st to end	Night	63% 6% 8% 17% 6%	1776
March	1st to 10th	Night	62% 4 11% 15% 7% 1	2160
	11th to 20th	Night	65% 4 8% 13% 10% 1	2075
	21st to end	Night	59% 5% 7% 18% 11% 1	2039
April	1st to 10th	Night	67% 4 7% 13% 7% 2	1800
	11th to 20th	Night	53% 5% 10% 19% 12% 1	1644
	21st to end	Night	54% 6% 9% 19% 11% 2	1620
May	1st to 10th	Night	57% 6% 9% 15% 12% 1	1490
	11th to 20th	Night	49% 6% 11% 20% 14% 1	1381
	21st to end	Night	55% 6% 7% 20% 12% 1	1357
June	1st to 10th	Night	51% 6% 12% 17% 11% 2	1260
	11th to 20th	Night	51% 7% 11% 16% 12% 2	1260
	21st to end	Night	52% 9% 11% 19% 10%	1260
July	1st to 10th	Night	51% 9% 14% 21% 5%	1225
	11th to 20th	Night	49% 10% 13% 19% 8%	1294
	21st to end	Night	52% 10% 15% 20% 3	1486
August	1st to 10th	Night	53% 9% 20% 16% 2	1422
	11th to 20th	Night	51% 10% 17% 19% 4	1523
	21st to end	Night	51% 10% 17% 19% 3	1822
September	1st to 10th	Night	49% 8% 16% 20% 8%	1800
	11th to 20th	Night	55% 7% 17% 16% 5%	1948
	21st to end	Night	52% 7% 13% 21% 7%	1980
October	1st to 10th	Night	53% 6% 14% 18% 7% 1	2012
	11th to 20th	Night	68% 5% 11% 12% 3	2340
	21st to end	Night	72% 6% 9% 10% 3 1	2574
November	1st to 10th	Night	73% 5% 10% 8% 3	2407
	11th to 20th	Night	74% 5% 9% 9% 3	2710
	21st to end	Night	79% 5% 8% 6% 1	2850
December	1st to 10th	Night	75% 5% 9% 9% 1	2850
	11th to 20th	Night	74% 5% 7% 10% 4	3532
	21st to end	Night	71% 5% 8% 10% 5% 1	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	17% 12% 40% 23% 7% 1	180
	11th to 20th	Day	18% 16% 34% 19% 9% 3	172
	21st to end	Day	18% 13% 31% 24% 13% 2	176
February	1st to 10th	Day	12% 19% 40% 21% 6% 1	160
	11th to 20th	Day	20% 21% 34% 17% 8%	319
	21st to end	Day	20% 18% 36% 17% 8% 1	346
March	1st to 10th	Day	20% 16% 31% 21% 10% 1	420
	11th to 20th	Day	22% 16% 32% 20% 8% 2	420
	21st to end	Day	24% 17% 32% 19% 6% 2	462
April	1st to 10th	Day	25% 18% 31% 17% 7% 2	420
	11th to 20th	Day	23% 17% 31% 19% 8% 3	412
	21st to end	Day	25% 17% 34% 15% 7% 2	420
May	1st to 10th	Day	29% 13% 27% 21% 8% 1	423
	11th to 20th	Day	18% 17% 33% 20% 11% 1	480
	21st to end	Day	28% 19% 29% 17% 7%	680
June	1st to 10th	Day	28% 13% 31% 20% 7% 1	630
	11th to 20th	Day	20% 16% 28% 23% 11% 1	630
	21st to end	Day	27% 9% 29% 22% 11% 2	630
July	1st to 10th	Day	23% 11% 31% 24% 10% 1	620
	11th to 20th	Day	25% 9% 27% 26% 12% 2	538
	21st to end	Day	24% 13% 25% 25% 11% 2	488
August	1st to 10th	Day	28% 9% 27% 23% 10% 3	446
	11th to 20th	Day	21% 11% 27% 22% 15% 4	439
	21st to end	Day	26% 12% 28% 17% 12% 6%	495
September	1st to 10th	Day	27% 15% 29% 16% 10% 4	450
	11th to 20th	Day	30% 14% 28% 18% 8% 3	450
	21st to end	Day	25% 18% 26% 19% 9% 3	450
October	1st to 10th	Day	25% 17% 29% 17% 8% 3	448
	11th to 20th	Day	39% 19% 22% 11% 6% 3	360
	21st to end	Day	39% 17% 23% 13% 7% 1	396
November	1st to 10th	Day	35% 20% 32% 9% 4 1	365
	11th to 20th	Day	30% 20% 29% 16% 5%	264
	21st to end	Day	31% 19% 35% 11% 3 1	180
December	1st to 10th	Day	25% 10% 26% 23% 10% 6%	180
	11th to 20th	Day	25% 20% 31% 14% 7% 2	180
	21st to end	Day	20% 22% 30% 20% 7% 1	198
January	1st to 10th	Night	18% 15% 36% 25% 6%	832
	11th to 20th	Night	21% 15% 33% 23% 9% 1	744
	21st to end	Night	14% 10% 32% 32% 11% 2	792
February	1st to 10th	Night	11% 14% 36% 28% 9% 1	720
	11th to 20th	Night	17% 16% 33% 25% 8% 1	703
	21st to end	Night	14% 17% 31% 28% 9% 1	592
March	1st to 10th	Night	15% 14% 35% 27% 9% 1	720
	11th to 20th	Night	21% 17% 28% 23% 9% 1	720
	21st to end	Night	20% 16% 31% 26% 6% 1	792
April	1st to 10th	Night	27% 13% 28% 25% 7%	720
	11th to 20th	Night	24% 12% 30% 26% 8% 1	580
	21st to end	Night	24% 11% 34% 24% 7% 1	540
May	1st to 10th	Night	27% 10% 28% 26% 9%	410
	11th to 20th	Night	23% 9% 32% 27% 8% 1	354
	21st to end	Night	26% 14% 29% 25% 6%	389
June	1st to 10th	Night	23% 7% 33% 27% 9% 1	360
	11th to 20th	Night	19% 11% 28% 29% 12% 1	360
	21st to end	Night	21% 8% 26% 35% 9% 1	360
July	1st to 10th	Night	24% 5% 30% 30% 11%	350
	11th to 20th	Night	18% 7% 26% 31% 17%	348
	21st to end	Night	22% 8% 22% 35% 13% 1	394
August	1st to 10th	Night	27% 6% 19% 32% 16% 1	358
	11th to 20th	Night	23% 4 27% 29% 16%	459
	21st to end	Night	25% 7% 24% 27% 15% 2	634
September	1st to 10th	Night	25% 11% 25% 25% 12% 1	720
	11th to 20th	Night	30% 12% 24% 24% 9% 2	720
	21st to end	Night	27% 11% 27% 24% 9% 1	720
October	1st to 10th	Night	28% 13% 30% 20% 7% 1	720
	11th to 20th	Night	38% 13% 21% 20% 8% 1	720
	21st to end	Night	37% 14% 23% 18% 8%	792
November	1st to 10th	Night	36% 16% 28% 15% 4 1	740
	11th to 20th	Night	27% 19% 26% 20% 6% 1	825
	21st to end	Night	30% 17% 30% 17% 6%	850
December	1st to 10th	Night	26% 16% 26% 21% 9% 2	850
	11th to 20th	Night	25% 18% 28% 20% 8% 1	850
	21st to end	Night	25% 17% 25% 23% 8% 2	935

Page generated at 2024-01-13 19:28:34. Version ac07

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