Quispamsis
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Quispamsis clear sky chart from 2005-11-06 to 2024-03-23.

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	20% 9% 3 6% 5% 3 4 4 5% 6% 34%	78427
	Night	21% 10% 3 6% 5% 3 4 4 5% 6% 33%	81454
Transparency	Day	52% 4 11% 21% 11% 1	78131
	Night	53% 4 10% 21% 11% 1	81285
Seeing	Day	30% 19% 30% 16% 5% 1	15590
	Night	28% 16% 28% 21% 6%	23597

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% 12% 4 9% 6% 3 5% 4 3 5% 36%	2207
	11th to 20th	Day	16% 11% 4 6% 6% 3 3 3 3 3 40%	2441
	21st to end	Day	14% 9% 3 6% 6% 4 6% 5% 6% 7% 34%	3124
February	1st to 10th	Day	17% 12% 4 7% 5% 4 5% 5% 5% 6% 31%	1710
	11th to 20th	Day	16% 12% 3 7% 7% 4 4 4 5% 6% 31%	1663
	21st to end	Day	12% 11% 4 7% 6% 3 4 5% 5% 6% 36%	1503
March	1st to 10th	Day	17% 13% 5% 8% 6% 3 5% 4 4 5% 31%	2019
	11th to 20th	Day	17% 11% 3 8% 6% 3 4 3 5% 6% 33%	2090
	21st to end	Day	18% 12% 3 7% 6% 4 4 4 4 5% 34%	2200
April	1st to 10th	Day	23% 13% 4 7% 6% 3 4 4 4 5% 27%	2086
	11th to 20th	Day	20% 10% 3 5% 6% 3 3 4 5% 6% 35%	2312
	21st to end	Day	24% 10% 3 6% 5% 3 3 4 5% 6% 30%	2340
May	1st to 10th	Day	24% 10% 4 6% 6% 4 4 4 4 6% 28%	2340
	11th to 20th	Day	23% 7% 3 5% 5% 2 4 4 4 5% 38%	2442
	21st to end	Day	21% 9% 4 6% 5% 3 5% 4 5% 7% 31%	2732
June	1st to 10th	Day	25% 9% 3 6% 6% 3 5% 4 4 7% 27%	2700
	11th to 20th	Day	22% 8% 3 6% 5% 3 4 4 4 7% 34%	2700
	21st to end	Day	29% 7% 3 6% 5% 3 3 4 5% 6% 29%	2700
July	1st to 10th	Day	19% 7% 3 6% 5% 3 5% 4 6% 8% 34%	2700
	11th to 20th	Day	19% 8% 3 5% 5% 3 4 5% 5% 8% 34%	2700
	21st to end	Day	20% 7% 3 5% 6% 4 5% 5% 5% 8% 32%	2573
August	1st to 10th	Day	17% 7% 2 6% 5% 3 5% 5% 5% 9% 35%	2327
	11th to 20th	Day	18% 8% 3 6% 5% 3 5% 5% 6% 8% 32%	2304
	21st to end	Day	16% 6% 3 5% 5% 3 4 4 5% 8% 41%	2562
September	1st to 10th	Day	15% 6% 2 5% 5% 3 5% 4 5% 8% 42%	2158
	11th to 20th	Day	20% 5% 2 4 4 2 4 4 4 6% 45%	1980
	21st to end	Day	22% 5% 3 3 3 2 3 3 5% 5% 45%	1980
October	1st to 10th	Day	18% 7% 2 6% 6% 2 4 4 5% 7% 40%	1814
	11th to 20th	Day	21% 8% 2 5% 5% 3 4 4 4 6% 37%	1800
	21st to end	Day	21% 9% 4 7% 6% 3 4 4 5% 6% 32%	1903
November	1st to 10th	Day	24% 9% 3 5% 6% 3 3 3 4 6% 35%	1591
	11th to 20th	Day	20% 8% 3 5% 5% 2 4 5% 4 7% 37%	1520
	21st to end	Day	22% 12% 4 6% 5% 3 5% 5% 4 6% 31%	1520
December	1st to 10th	Day	26% 10% 4 7% 4 3 4 4 4 6% 28%	1520
	11th to 20th	Day	24% 14% 4 8% 5% 3 3 4 4 5% 27%	1735
	21st to end	Day	22% 9% 3 6% 5% 3 5% 4 4 6% 33%	2431
January	1st to 10th	Night	14% 9% 3 6% 5% 4 5% 5% 5% 6% 37%	4748
	11th to 20th	Night	17% 11% 4 7% 6% 4 4 4 4 5% 33%	4503
	21st to end	Night	15% 12% 4 7% 7% 3 4 5% 6% 7% 31%	4532
February	1st to 10th	Night	18% 11% 3 6% 5% 3 5% 5% 5% 6% 31%	2470
	11th to 20th	Night	17% 12% 4 8% 6% 4 5% 5% 4 5% 30%	2403
	21st to end	Night	14% 10% 5% 7% 7% 3 5% 5% 5% 5% 34%	1947
March	1st to 10th	Night	17% 12% 3 8% 5% 4 5% 4 4 5% 33%	2146
	11th to 20th	Night	19% 10% 4 8% 5% 4 5% 5% 5% 6% 29%	2089
	21st to end	Night	18% 11% 4 7% 6% 4 4 4 4 5% 34%	2201
April	1st to 10th	Night	24% 11% 4 7% 5% 3 5% 4 4 4 29%	1870
	11th to 20th	Night	24% 9% 2 5% 5% 2 5% 4 4 6% 34%	1598
	21st to end	Night	26% 9% 4 6% 5% 3 5% 4 5% 6% 28%	1620
May	1st to 10th	Night	23% 9% 3 7% 5% 3 4 5% 4 5% 29%	1620
	11th to 20th	Night	27% 9% 2 5% 5% 3 4 5% 4 6% 30%	1452
	21st to end	Night	21% 10% 4 6% 5% 3 4 4 5% 7% 30%	1550
June	1st to 10th	Night	27% 11% 3 6% 6% 3 5% 4 5% 5% 25%	1265
	11th to 20th	Night	23% 9% 3 6% 6% 3 4 4 5% 5% 32%	1260
	21st to end	Night	32% 8% 4 5% 4 3 4 3 4 5% 27%	1260
July	1st to 10th	Night	20% 11% 4 7% 5% 3 5% 6% 5% 6% 29%	1260
	11th to 20th	Night	23% 10% 3 6% 5% 3 5% 4 5% 7% 29%	1260
	21st to end	Night	22% 11% 3 7% 5% 3 5% 6% 5% 8% 25%	1721
August	1st to 10th	Night	18% 7% 4 6% 7% 3 4 4 6% 8% 34%	1612
	11th to 20th	Night	22% 10% 3 6% 5% 4 5% 5% 5% 6% 29%	1596
	21st to end	Night	16% 8% 3 4 5% 3 3 5% 5% 8% 40%	1793
September	1st to 10th	Night	18% 7% 2 6% 5% 3 5% 4 6% 7% 39%	1800
	11th to 20th	Night	21% 6% 2 6% 4 2 3 3 5% 7% 42%	1980
	21st to end	Night	22% 6% 2 4 4 2 3 4 4 7% 42%	1980
October	1st to 10th	Night	21% 6% 3 4 4 3 4 4 5% 7% 39%	2145
	11th to 20th	Night	19% 8% 3 6% 5% 3 4 4 5% 5% 38%	2160
	21st to end	Night	23% 10% 3 6% 6% 3 4 5% 4 5% 33%	2452
November	1st to 10th	Night	23% 8% 3 5% 4 3 4 4 5% 6% 35%	2486
	11th to 20th	Night	21% 8% 3 6% 4 3 4 5% 5% 6% 34%	2660
	21st to end	Night	21% 9% 3 6% 5% 3 4 4 5% 6% 33%	2660
December	1st to 10th	Night	27% 11% 3 7% 4 3 4 4 4 5% 28%	2660
	11th to 20th	Night	27% 11% 3 6% 5% 3 4 4 4 5% 28%	3459
	21st to end	Night	22% 12% 4 7% 5% 3 4 3 4 4 32%	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	53% 3 15% 18% 10% 1	2208
	11th to 20th	Day	50% 4 5% 27% 13% 1	2441
	21st to end	Day	49% 3 13% 19% 15% 1	3124
February	1st to 10th	Day	55% 4 10% 19% 10% 2	1710
	11th to 20th	Day	54% 3 11% 18% 12% 2	1671
	21st to end	Day	49% 5% 9% 24% 10% 3	1503
March	1st to 10th	Day	56% 4 7% 20% 11% 2	2023
	11th to 20th	Day	52% 4 10% 17% 14% 2	2090
	21st to end	Day	53% 4 6% 19% 13% 4	2200
April	1st to 10th	Day	60% 3 8% 14% 12% 2	2086
	11th to 20th	Day	50% 3 8% 23% 14% 2	2312
	21st to end	Day	56% 3 10% 17% 12% 3	2340
May	1st to 10th	Day	59% 4 7% 19% 10% 1	2340
	11th to 20th	Day	50% 4 8% 25% 12% 2	2446
	21st to end	Day	54% 5% 12% 20% 9% 1	2732
June	1st to 10th	Day	58% 4 9% 19% 8% 1	2700
	11th to 20th	Day	52% 4 10% 21% 11% 2	2700
	21st to end	Day	57% 5% 11% 16% 10% 1	2700
July	1st to 10th	Day	49% 5% 15% 21% 10% 1	2625
	11th to 20th	Day	49% 5% 15% 23% 8% 1	2619
	21st to end	Day	51% 5% 15% 22% 7%	2429
August	1st to 10th	Day	47% 6% 16% 22% 9%	2314
	11th to 20th	Day	50% 5% 13% 24% 8%	2304
	21st to end	Day	42% 4 14% 27% 12% 1	2562
September	1st to 10th	Day	42% 4 12% 26% 14% 1	2158
	11th to 20th	Day	42% 4 10% 26% 15% 3	1980
	21st to end	Day	43% 4 8% 27% 17% 1	1980
October	1st to 10th	Day	46% 4 9% 28% 13%	1814
	11th to 20th	Day	49% 4 12% 26% 9%	1800
	21st to end	Day	53% 4 10% 20% 13%	1903
November	1st to 10th	Day	53% 4 9% 22% 11% 1	1591
	11th to 20th	Day	48% 5% 13% 19% 14% 1	1520
	21st to end	Day	56% 4 11% 21% 8%	1520
December	1st to 10th	Day	59% 4 9% 20% 7% 1	1520
	11th to 20th	Day	61% 4 8% 16% 10% 1	1735
	21st to end	Day	54% 4 12% 18% 10% 2	2431
January	1st to 10th	Night	48% 3 11% 29% 7% 1	4748
	11th to 20th	Night	55% 4 7% 23% 9% 1	4503
	21st to end	Night	52% 3 9% 24% 11% 1	4532
February	1st to 10th	Night	53% 4 11% 18% 13% 1	2470
	11th to 20th	Night	56% 4 8% 19% 11% 2	2406
	21st to end	Night	52% 5% 8% 20% 12% 3	1947
March	1st to 10th	Night	54% 3 8% 19% 14% 2	2155
	11th to 20th	Night	56% 4 10% 16% 13% 2	2090
	21st to end	Night	52% 5% 6% 19% 14% 3	2201
April	1st to 10th	Night	59% 4 8% 14% 12% 4	1870
	11th to 20th	Night	52% 3 9% 21% 14% 1	1598
	21st to end	Night	56% 4 9% 18% 12% 1	1620
May	1st to 10th	Night	57% 4 9% 18% 10% 2	1620
	11th to 20th	Night	56% 4 8% 21% 10% 1	1453
	21st to end	Night	55% 4 11% 18% 11% 1	1551
June	1st to 10th	Night	61% 4 9% 18% 7% 1	1265
	11th to 20th	Night	54% 4 10% 22% 8% 2	1260
	21st to end	Night	61% 4 7% 17% 9% 1	1260
July	1st to 10th	Night	56% 5% 14% 16% 9%	1225
	11th to 20th	Night	57% 4 9% 21% 9%	1218
	21st to end	Night	57% 6% 12% 17% 7% 1	1625
August	1st to 10th	Night	50% 6% 12% 24% 8%	1600
	11th to 20th	Night	56% 5% 12% 21% 6%	1596
	21st to end	Night	44% 4 13% 26% 12% 1	1793
September	1st to 10th	Night	44% 4 11% 27% 13% 1	1800
	11th to 20th	Night	45% 4 10% 24% 17% 1	1980
	21st to end	Night	45% 3 8% 28% 14% 2	1980
October	1st to 10th	Night	45% 3 10% 26% 15% 1	2145
	11th to 20th	Night	48% 4 11% 26% 10% 1	2160
	21st to end	Night	54% 4 10% 19% 12% 1	2452
November	1st to 10th	Night	51% 4 12% 21% 12% 1	2486
	11th to 20th	Night	52% 4 10% 20% 13% 1	2660
	21st to end	Night	52% 5% 13% 19% 10% 1	2660
December	1st to 10th	Night	60% 4 9% 19% 8%	2660
	11th to 20th	Night	61% 3 7% 19% 9%	3460
	21st to end	Night	57% 3 10% 19% 7% 4	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	31% 26% 31% 12% 1	180
	11th to 20th	Day	39% 21% 31% 8% 2	180
	21st to end	Day	22% 25% 35% 15% 4	407
February	1st to 10th	Day	31% 25% 27% 14% 4	370
	11th to 20th	Day	28% 31% 27% 12% 2 1	366
	21st to end	Day	25% 29% 30% 14% 1	350
March	1st to 10th	Day	30% 25% 33% 10% 2	460
	11th to 20th	Day	28% 25% 30% 13% 3 1	460
	21st to end	Day	35% 21% 28% 9% 4 1	470
April	1st to 10th	Day	39% 29% 21% 8% 3	420
	11th to 20th	Day	33% 25% 26% 11% 4	412
	21st to end	Day	33% 22% 27% 13% 5% 1	420
May	1st to 10th	Day	35% 20% 31% 10% 4	423
	11th to 20th	Day	29% 18% 29% 18% 4 1	588
	21st to end	Day	32% 18% 28% 17% 4 1	680
June	1st to 10th	Day	34% 17% 27% 17% 6%	630
	11th to 20th	Day	29% 15% 28% 21% 6% 1	630
	21st to end	Day	34% 11% 27% 20% 7% 1	630
July	1st to 10th	Day	30% 9% 32% 21% 7% 1	620
	11th to 20th	Day	29% 8% 31% 23% 8% 2	618
	21st to end	Day	27% 12% 35% 19% 6% 1	503
August	1st to 10th	Day	22% 11% 33% 27% 6% 1	446
	11th to 20th	Day	28% 9% 34% 21% 7% 1	439
	21st to end	Day	23% 14% 27% 26% 8% 1	495
September	1st to 10th	Day	18% 12% 41% 22% 6% 2	450
	11th to 20th	Day	28% 14% 28% 20% 7% 3	450
	21st to end	Day	25% 17% 32% 18% 6% 2	450
October	1st to 10th	Day	25% 16% 28% 20% 10% 2	367
	11th to 20th	Day	25% 18% 29% 19% 6% 2	360
	21st to end	Day	28% 21% 32% 15% 3 1	396
November	1st to 10th	Day	30% 18% 31% 14% 5% 2	365
	11th to 20th	Day	29% 23% 27% 16% 5%	370
	21st to end	Day	35% 25% 28% 8% 3 1	370
December	1st to 10th	Day	36% 20% 28% 13% 3	370
	11th to 20th	Day	37% 28% 24% 9% 2	247
	21st to end	Day	34% 29% 25% 11% 1 1	198
January	1st to 10th	Night	28% 23% 27% 18% 4	850
	11th to 20th	Night	31% 21% 27% 17% 4	778
	21st to end	Night	21% 26% 33% 16% 4	836
February	1st to 10th	Night	29% 22% 28% 18% 2	760
	11th to 20th	Night	26% 26% 29% 17% 2	743
	21st to end	Night	24% 22% 29% 22% 3 1	628
March	1st to 10th	Night	26% 21% 35% 17% 2	760
	11th to 20th	Night	26% 18% 31% 21% 4	760
	21st to end	Night	25% 20% 31% 18% 6% 1	801
April	1st to 10th	Night	32% 19% 29% 17% 3	621
	11th to 20th	Night	30% 15% 33% 17% 5%	534
	21st to end	Night	29% 16% 29% 20% 5%	540
May	1st to 10th	Night	30% 11% 31% 23% 5% 1	540
	11th to 20th	Night	31% 12% 33% 20% 4	532
	21st to end	Night	29% 14% 34% 19% 4 1	583
June	1st to 10th	Night	37% 6% 25% 26% 6%	365
	11th to 20th	Night	29% 8% 28% 30% 5%	360
	21st to end	Night	35% 5% 23% 29% 7% 1	360
July	1st to 10th	Night	29% 6% 26% 31% 9%	350
	11th to 20th	Night	31% 5% 22% 32% 9% 1	348
	21st to end	Night	29% 5% 28% 30% 8%	559
August	1st to 10th	Night	21% 5% 29% 34% 10% 1	538
	11th to 20th	Night	30% 7% 24% 29% 10%	532
	21st to end	Night	23% 7% 26% 30% 14% 1	594
September	1st to 10th	Night	23% 7% 32% 28% 9% 1	540
	11th to 20th	Night	26% 10% 23% 26% 13% 1	720
	21st to end	Night	26% 11% 28% 23% 11% 1	720
October	1st to 10th	Night	27% 9% 26% 27% 10% 2	720
	11th to 20th	Night	24% 15% 29% 21% 10% 1	720
	21st to end	Night	30% 18% 27% 22% 3	792
November	1st to 10th	Night	29% 17% 26% 19% 8% 1	778
	11th to 20th	Night	28% 21% 25% 20% 6% 1	850
	21st to end	Night	30% 21% 24% 19% 5%	850
December	1st to 10th	Night	34% 20% 28% 16% 3	850
	11th to 20th	Night	33% 25% 27% 12% 2	850
	21st to end	Night	32% 24% 24% 16% 4	935

Page generated at 2024-03-20 00:31:09. Version ac07

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