Hearts Content Scenic Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hearts Content Scenic Area clear sky chart from 2005-11-06 to 2024-04-10.

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	18% 12% 5% 8% 6% 3 4 4 5% 6% 28%	83174
	Night	18% 13% 6% 8% 6% 3 4 4 4 6% 28%	85590
Transparency	Day	56% 7% 11% 17% 8% 1	82891
	Night	57% 7% 11% 16% 8% 1	85407
Seeing	Day	26% 17% 28% 18% 9% 3	13794
	Night	25% 15% 27% 22% 9% 1	23481

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	19% 23% 12% 12% 6% 3 3 3 3 4 13%	2590
	11th to 20th	Day	12% 22% 10% 16% 11% 3 3 2 3 3 15%	2840
	21st to end	Day	25% 18% 10% 15% 8% 3 3 3 3 3 9%	3124
February	1st to 10th	Day	18% 18% 7% 12% 9% 5% 5% 3 2 4 17%	1710
	11th to 20th	Day	16% 14% 8% 15% 9% 3 5% 4 4 5% 18%	1663
	21st to end	Day	20% 15% 5% 11% 7% 3 4 3 5% 6% 22%	1524
March	1st to 10th	Day	21% 11% 8% 8% 5% 2 3 4 4 6% 28%	3432
	11th to 20th	Day	12% 18% 8% 9% 6% 3 3 3 4 6% 28%	3480
	21st to end	Day	20% 12% 4 10% 6% 2 4 4 5% 6% 29%	3815
April	1st to 10th	Day	18% 14% 6% 6% 6% 3 4 3 5% 6% 29%	2227
	11th to 20th	Day	21% 13% 4 5% 4 3 4 5% 4 5% 32%	2140
	21st to end	Day	23% 12% 3 6% 5% 2 4 3 4 5% 33%	2340
May	1st to 10th	Day	20% 11% 3 7% 6% 4 5% 4 4 7% 29%	2340
	11th to 20th	Day	22% 8% 3 6% 7% 3 4 4 5% 7% 30%	2383
	21st to end	Day	14% 6% 2 5% 6% 3 6% 6% 6% 8% 38%	2725
June	1st to 10th	Day	18% 6% 3 7% 6% 4 4 5% 6% 8% 34%	2520
	11th to 20th	Day	17% 6% 3 6% 7% 3 5% 5% 6% 9% 33%	2520
	21st to end	Day	18% 6% 3 4 5% 4 4 5% 6% 10% 36%	2520
July	1st to 10th	Day	12% 6% 3 5% 7% 4 5% 5% 6% 8% 39%	2520
	11th to 20th	Day	13% 6% 3 6% 6% 4 5% 6% 7% 9% 35%	2436
	21st to end	Day	14% 6% 3 6% 6% 4 6% 6% 6% 9% 33%	2547
August	1st to 10th	Day	12% 5% 2 6% 6% 4 6% 6% 7% 9% 35%	2327
	11th to 20th	Day	14% 7% 4 6% 6% 4 6% 8% 7% 9% 28%	2303
	21st to end	Day	16% 6% 2 5% 6% 4 6% 5% 6% 9% 35%	2436
September	1st to 10th	Day	21% 8% 3 5% 5% 3 4 4 5% 7% 37%	2160
	11th to 20th	Day	15% 6% 3 6% 5% 4 4 5% 6% 8% 38%	2053
	21st to end	Day	19% 7% 3 7% 6% 4 4 5% 6% 7% 32%	1940
October	1st to 10th	Day	20% 8% 3 7% 5% 3 5% 5% 5% 8% 32%	1800
	11th to 20th	Day	22% 11% 3 8% 6% 3 4 4 5% 5% 30%	1800
	21st to end	Day	27% 13% 3 7% 5% 3 4 3 4 5% 24%	1980
November	1st to 10th	Day	14% 13% 5% 7% 5% 3 4 4 5% 7% 33%	1741
	11th to 20th	Day	19% 17% 4 7% 6% 3 4 4 5% 6% 24%	1520
	21st to end	Day	22% 21% 6% 6% 5% 3 4 4 4 6% 18%	1520
December	1st to 10th	Day	20% 24% 11% 13% 4 3 3 4 3 4 12%	1520
	11th to 20th	Day	18% 21% 9% 12% 5% 3 4 3 4 5% 17%	1906
	21st to end	Day	26% 24% 9% 10% 5% 2 3 3 3 3 12%	2772
January	1st to 10th	Night	17% 22% 11% 15% 6% 3 4 3 3 4 12%	4351
	11th to 20th	Night	15% 19% 10% 16% 7% 4 5% 4 3 4 11%	4120
	21st to end	Night	26% 18% 9% 14% 8% 3 3 3 2 3 12%	4532
February	1st to 10th	Night	18% 17% 7% 11% 10% 4 4 4 3 3 18%	2470
	11th to 20th	Night	16% 14% 8% 13% 9% 4 6% 4 4 5% 18%	2403
	21st to end	Night	21% 12% 7% 13% 7% 4 4 3 3 5% 21%	1923
March	1st to 10th	Night	22% 14% 5% 8% 6% 3 3 3 3 5% 28%	3408
	11th to 20th	Night	18% 17% 9% 7% 5% 2 3 4 4 5% 27%	3479
	21st to end	Night	18% 11% 5% 8% 5% 2 4 3 4 5% 36%	3817
April	1st to 10th	Night	20% 14% 6% 6% 4 3 4 4 5% 6% 29%	1943
	11th to 20th	Night	19% 10% 4 5% 4 3 5% 4 4 6% 35%	1775
	21st to end	Night	16% 11% 4 6% 5% 3 4 5% 5% 9% 33%	1630
May	1st to 10th	Night	20% 10% 3 6% 5% 3 5% 5% 5% 6% 34%	1620
	11th to 20th	Night	17% 8% 4 6% 5% 2 5% 4 5% 6% 37%	1509
	21st to end	Night	12% 5% 2 6% 4 3 4 5% 5% 10% 42%	1550
June	1st to 10th	Night	13% 5% 3 6% 5% 3 5% 4 7% 8% 41%	1440
	11th to 20th	Night	13% 6% 3 5% 5% 3 4 4 6% 8% 41%	1440
	21st to end	Night	14% 6% 2 6% 4 3 4 3 6% 10% 42%	1440
July	1st to 10th	Night	10% 6% 3 5% 5% 3 4 4 5% 8% 47%	1440
	11th to 20th	Night	10% 6% 2 5% 5% 3 3 4 6% 9% 46%	1520
	21st to end	Night	12% 5% 2 5% 5% 3 6% 5% 6% 9% 42%	1771
August	1st to 10th	Night	9% 5% 2 5% 5% 3 4 5% 6% 9% 45%	1611
	11th to 20th	Night	14% 5% 2 4 5% 3 4 6% 7% 8% 42%	1598
	21st to end	Night	13% 5% 2 4 5% 3 4 5% 7% 9% 45%	1900
September	1st to 10th	Night	15% 7% 3 4 4 2 4 4 5% 6% 45%	1800
	11th to 20th	Night	12% 5% 2 5% 4 3 4 5% 6% 7% 48%	1903
	21st to end	Night	19% 8% 3 6% 6% 2 5% 4 4 6% 37%	2019
October	1st to 10th	Night	18% 6% 2 5% 5% 3 5% 4 4 8% 40%	2160
	11th to 20th	Night	23% 8% 3 6% 5% 2 4 4 5% 7% 32%	2160
	21st to end	Night	30% 10% 3 5% 5% 3 4 4 4 5% 28%	2376
November	1st to 10th	Night	15% 12% 3 6% 4 3 4 4 5% 6% 37%	2330
	11th to 20th	Night	19% 17% 4 7% 5% 3 4 5% 4 6% 25%	2660
	21st to end	Night	20% 19% 5% 8% 6% 3 4 4 5% 6% 20%	2660
December	1st to 10th	Night	22% 22% 11% 9% 5% 3 4 4 3 4 13%	2660
	11th to 20th	Night	21% 19% 8% 13% 7% 2 4 3 4 4 16%	3288
	21st to end	Night	25% 22% 9% 9% 6% 3 4 4 4 4 10%	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	76% 5% 7% 10% 3	2591
	11th to 20th	Day	76% 3 8% 10% 3	2840
	21st to end	Day	82% 4 6% 5% 2 1	3124
February	1st to 10th	Day	74% 4 8% 10% 5%	1710
	11th to 20th	Day	68% 6% 8% 12% 6%	1672
	21st to end	Day	64% 5% 10% 13% 5% 2	1524
March	1st to 10th	Day	57% 6% 11% 21% 5%	3435
	11th to 20th	Day	56% 8% 15% 16% 5% 1	3480
	21st to end	Day	55% 7% 7% 19% 10% 1	3815
April	1st to 10th	Day	56% 5% 11% 16% 12% 1	2227
	11th to 20th	Day	53% 6% 9% 18% 11% 2	2140
	21st to end	Day	54% 6% 10% 17% 11% 2	2340
May	1st to 10th	Day	55% 6% 10% 18% 9% 2	2340
	11th to 20th	Day	54% 7% 9% 17% 11% 2	2387
	21st to end	Day	42% 10% 16% 19% 12% 1	2725
June	1st to 10th	Day	47% 9% 12% 19% 13% 1	2520
	11th to 20th	Day	46% 9% 13% 19% 12% 1	2520
	21st to end	Day	44% 8% 13% 25% 11% 1	2520
July	1st to 10th	Day	41% 8% 12% 23% 14% 2	2450
	11th to 20th	Day	42% 9% 15% 20% 14%	2361
	21st to end	Day	44% 9% 14% 19% 13% 1	2405
August	1st to 10th	Day	42% 10% 14% 25% 8% 1	2314
	11th to 20th	Day	47% 11% 15% 18% 7% 1	2303
	21st to end	Day	44% 8% 13% 21% 12% 2	2436
September	1st to 10th	Day	47% 6% 11% 20% 14% 2	2160
	11th to 20th	Day	43% 7% 12% 23% 13% 1	2053
	21st to end	Day	50% 8% 11% 20% 11%	1940
October	1st to 10th	Day	49% 8% 14% 16% 12% 1	1800
	11th to 20th	Day	55% 8% 12% 18% 7%	1800
	21st to end	Day	62% 6% 11% 13% 7% 1	1980
November	1st to 10th	Day	50% 7% 12% 15% 13% 2	1741
	11th to 20th	Day	60% 6% 12% 14% 6% 2	1520
	21st to end	Day	67% 6% 11% 11% 4 1	1520
December	1st to 10th	Day	77% 4 8% 8% 2	1520
	11th to 20th	Day	71% 6% 9% 11% 3	1906
	21st to end	Day	78% 6% 8% 7% 1	2772
January	1st to 10th	Night	77% 5% 7% 8% 3	4351
	11th to 20th	Night	78% 5% 8% 7% 2	4120
	21st to end	Night	80% 4 6% 8% 2	4532
February	1st to 10th	Night	71% 5% 7% 12% 5%	2470
	11th to 20th	Night	69% 6% 8% 12% 5%	2405
	21st to end	Night	66% 5% 9% 12% 8%	1923
March	1st to 10th	Night	59% 5% 9% 22% 5%	3418
	11th to 20th	Night	58% 7% 14% 15% 6% 1	3480
	21st to end	Night	50% 6% 9% 19% 14% 2	3817
April	1st to 10th	Night	55% 6% 11% 17% 11% 1	1943
	11th to 20th	Night	49% 6% 12% 19% 12% 2	1775
	21st to end	Night	49% 7% 12% 18% 11% 3	1630
May	1st to 10th	Night	50% 6% 11% 18% 11% 3	1620
	11th to 20th	Night	46% 9% 11% 19% 14% 2	1510
	21st to end	Night	37% 9% 15% 23% 14% 2	1551
June	1st to 10th	Night	39% 8% 14% 24% 14% 1	1440
	11th to 20th	Night	42% 8% 13% 22% 14% 2	1440
	21st to end	Night	38% 9% 13% 23% 16%	1440
July	1st to 10th	Night	36% 9% 10% 24% 18% 2	1400
	11th to 20th	Night	34% 7% 16% 23% 19% 2	1472
	21st to end	Night	37% 9% 17% 19% 18% 1	1672
August	1st to 10th	Night	34% 10% 15% 29% 12% 1	1600
	11th to 20th	Night	38% 10% 15% 25% 11% 1	1598
	21st to end	Night	34% 9% 17% 24% 13% 3	1900
September	1st to 10th	Night	39% 8% 13% 23% 14% 3	1800
	11th to 20th	Night	33% 8% 14% 26% 18% 1	1903
	21st to end	Night	48% 6% 13% 18% 13% 1	2019
October	1st to 10th	Night	43% 7% 14% 20% 14% 1	2160
	11th to 20th	Night	49% 8% 14% 17% 11% 1	2160
	21st to end	Night	58% 7% 11% 15% 8% 1	2376
November	1st to 10th	Night	46% 6% 13% 20% 11% 3	2330
	11th to 20th	Night	59% 7% 10% 14% 7% 3	2660
	21st to end	Night	64% 7% 11% 14% 4 1	2660
December	1st to 10th	Night	75% 6% 8% 8% 3	2660
	11th to 20th	Night	72% 6% 10% 10% 2	3288
	21st to end	Night	77% 7% 8% 7% 1	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	34% 27% 28% 9% 2	202
	11th to 20th	Day	38% 29% 24% 6% 2 1	270
	21st to end	Day	34% 29% 29% 7% 1	297
February	1st to 10th	Day	34% 29% 30% 7%	270
	11th to 20th	Day	39% 30% 27% 4	270
	21st to end	Day	41% 24% 29% 6%	279
March	1st to 10th	Day	33% 23% 31% 11% 3	460
	11th to 20th	Day	32% 22% 33% 9% 3 2	460
	21st to end	Day	38% 21% 26% 12% 4 1	506
April	1st to 10th	Day	30% 25% 24% 15% 4 1	457
	11th to 20th	Day	29% 23% 25% 14% 8% 2	412
	21st to end	Day	31% 20% 29% 16% 3 1	420
May	1st to 10th	Day	31% 22% 25% 14% 7% 1	423
	11th to 20th	Day	26% 15% 27% 23% 7% 2	447
	21st to end	Day	17% 13% 30% 21% 15% 5%	485
June	1st to 10th	Day	21% 13% 31% 25% 8% 2	450
	11th to 20th	Day	20% 14% 27% 24% 13% 2	450
	21st to end	Day	21% 12% 32% 24% 8% 2	450
July	1st to 10th	Day	15% 7% 26% 27% 19% 7%	445
	11th to 20th	Day	14% 8% 30% 25% 16% 7%	444
	21st to end	Day	15% 9% 32% 24% 15% 5%	488
August	1st to 10th	Day	13% 7% 26% 27% 20% 8%	446
	11th to 20th	Day	18% 5% 26% 29% 12% 10%	439
	21st to end	Day	17% 8% 27% 27% 14% 8%	495
September	1st to 10th	Day	22% 11% 21% 24% 15% 7%	450
	11th to 20th	Day	15% 5% 25% 26% 19% 9%	450
	21st to end	Day	23% 12% 28% 19% 15% 4	450
October	1st to 10th	Day	23% 13% 28% 18% 14% 4	450
	11th to 20th	Day	30% 18% 32% 14% 5% 1	450
	21st to end	Day	36% 19% 28% 14% 3	495
November	1st to 10th	Day	26% 19% 28% 17% 7% 2	366
	11th to 20th	Day	36% 22% 27% 11% 4 1	180
	21st to end	Day	34% 24% 33% 8% 1	180
December	1st to 10th	Day	39% 27% 23% 7% 3 2	180
	11th to 20th	Day	40% 22% 28% 9% 1	180
	21st to end	Day	37% 24% 31% 6% 2	198
January	1st to 10th	Night	32% 23% 33% 10% 3	760
	11th to 20th	Night	33% 22% 30% 13% 2	760
	21st to end	Night	27% 25% 31% 15% 2	836
February	1st to 10th	Night	33% 21% 30% 16% 1	760
	11th to 20th	Night	30% 25% 34% 10% 1	743
	21st to end	Night	32% 25% 28% 13% 2	628
March	1st to 10th	Night	27% 23% 32% 16% 3	760
	11th to 20th	Night	30% 21% 25% 19% 5%	760
	21st to end	Night	29% 18% 32% 17% 3 1	836
April	1st to 10th	Night	31% 16% 31% 18% 5%	760
	11th to 20th	Night	28% 15% 29% 18% 10%	711
	21st to end	Night	22% 13% 33% 28% 4 1	550
May	1st to 10th	Night	25% 10% 25% 29% 11%	540
	11th to 20th	Night	22% 9% 31% 30% 8%	448
	21st to end	Night	13% 8% 30% 28% 19% 2	389
June	1st to 10th	Night	14% 4 30% 36% 15% 1	360
	11th to 20th	Night	15% 8% 27% 38% 12%	360
	21st to end	Night	17% 6% 29% 34% 13% 1	360
July	1st to 10th	Night	11% 5% 21% 39% 21% 4	350
	11th to 20th	Night	13% 4 20% 38% 23% 2	428
	21st to end	Night	13% 3 19% 42% 21% 1	591
August	1st to 10th	Night	12% 3 18% 39% 27% 2	537
	11th to 20th	Night	16% 3 17% 32% 28% 4	534
	21st to end	Night	14% 4 21% 32% 26% 3	712
September	1st to 10th	Night	18% 7% 22% 29% 21% 3	720
	11th to 20th	Night	14% 5% 20% 32% 24% 4	720
	21st to end	Night	22% 10% 22% 26% 17% 3	720
October	1st to 10th	Night	23% 8% 23% 26% 17% 3	720
	11th to 20th	Night	27% 13% 29% 23% 7% 1	720
	21st to end	Night	35% 14% 27% 21% 3	792
November	1st to 10th	Night	22% 15% 29% 24% 9%	740
	11th to 20th	Night	32% 16% 29% 17% 5% 1	760
	21st to end	Night	31% 20% 29% 16% 4	760
December	1st to 10th	Night	37% 24% 25% 11% 3	760
	11th to 20th	Night	30% 26% 27% 14% 3	760
	21st to end	Night	32% 23% 30% 13% 2	836

Page generated at 2024-04-07 09:28:14. Version ac07

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