Haliburton County
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Haliburton County clear sky chart from 2005-11-06 to 2024-02-05.

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% 5% 8% 6% 3 4 4 5% 6% 29%	78391
	Night	17% 13% 5% 9% 6% 3 4 4 4 6% 28%	80441
Transparency	Day	55% 6% 10% 18% 9% 1	78099
	Night	57% 6% 10% 17% 9% 1	80267
Seeing	Day	24% 17% 30% 19% 8% 3	13562
	Night	23% 14% 30% 22% 9% 1	22743

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	15% 22% 9% 16% 6% 2 3 2 3 3 20%	2517
	11th to 20th	Day	13% 16% 10% 18% 10% 4 4 3 4 3 13%	2556
	21st to end	Day	17% 21% 10% 12% 6% 4 3 2 3 3 18%	3124
February	1st to 10th	Day	13% 18% 7% 15% 10% 5% 4 3 4 3 18%	1656
	11th to 20th	Day	13% 16% 7% 13% 7% 3 4 4 3 5% 24%	1573
	21st to end	Day	17% 18% 6% 10% 8% 3 5% 5% 3 4 21%	1373
March	1st to 10th	Day	15% 12% 5% 11% 8% 3 5% 4 5% 6% 27%	1941
	11th to 20th	Day	12% 16% 7% 8% 9% 3 5% 4 4 5% 27%	1980
	21st to end	Day	18% 11% 4 6% 5% 3 4 3 5% 5% 35%	2189
April	1st to 10th	Day	21% 14% 4 6% 5% 3 4 4 4 6% 27%	2160
	11th to 20th	Day	22% 11% 3 6% 4 3 4 3 4 5% 35%	2176
	21st to end	Day	22% 12% 4 6% 5% 4 4 3 3 5% 32%	2340
May	1st to 10th	Day	19% 9% 3 7% 6% 4 4 5% 5% 7% 33%	2425
	11th to 20th	Day	17% 8% 4 6% 6% 3 4 4 3 7% 37%	2478
	21st to end	Day	15% 6% 2 7% 5% 3 6% 5% 5% 7% 38%	2725
June	1st to 10th	Day	21% 8% 3 6% 5% 3 5% 5% 5% 7% 32%	2520
	11th to 20th	Day	16% 6% 3 5% 5% 3 5% 5% 6% 8% 35%	2527
	21st to end	Day	17% 7% 3 6% 6% 4 5% 5% 7% 8% 33%	2700
July	1st to 10th	Day	15% 5% 2 4 6% 3 5% 6% 6% 10% 40%	2584
	11th to 20th	Day	13% 7% 3 6% 6% 4 6% 5% 7% 8% 37%	2520
	21st to end	Day	13% 7% 3 6% 6% 4 6% 6% 7% 9% 35%	2704
August	1st to 10th	Day	14% 6% 2 7% 7% 4 6% 5% 6% 9% 34%	2327
	11th to 20th	Day	14% 6% 2 6% 6% 4 6% 5% 7% 7% 36%	2303
	21st to end	Day	14% 7% 3 5% 6% 4 5% 7% 6% 9% 35%	2458
September	1st to 10th	Day	17% 8% 2 5% 5% 3 4 5% 5% 8% 37%	2160
	11th to 20th	Day	15% 6% 3 6% 5% 3 4 5% 5% 7% 42%	2120
	21st to end	Day	18% 8% 3 6% 6% 3 4 5% 5% 6% 35%	1904
October	1st to 10th	Day	22% 9% 3 7% 6% 3 4 4 5% 7% 32%	1800
	11th to 20th	Day	28% 11% 3 7% 7% 4 5% 4 5% 5% 22%	1800
	21st to end	Day	30% 13% 4 8% 5% 2 4 4 4 5% 20%	1968
November	1st to 10th	Day	18% 14% 4 7% 5% 3 4 4 6% 7% 29%	1545
	11th to 20th	Day	19% 17% 7% 8% 5% 3 5% 5% 5% 6% 22%	1520
	21st to end	Day	21% 21% 8% 9% 7% 4 4 3 4 4 15%	1520
December	1st to 10th	Day	19% 24% 9% 9% 6% 3 4 4 4 4 14%	1520
	11th to 20th	Day	18% 18% 9% 13% 7% 3 3 3 3 4 20%	1906
	21st to end	Day	24% 22% 7% 11% 6% 3 2 2 3 4 16%	2772
January	1st to 10th	Night	17% 20% 10% 13% 7% 3 3 3 4 4 14%	4429
	11th to 20th	Night	13% 15% 8% 17% 13% 4 5% 4 4 4 13%	4402
	21st to end	Night	17% 17% 9% 12% 8% 4 6% 3 3 3 16%	4532
February	1st to 10th	Night	13% 19% 7% 11% 9% 4 6% 4 5% 5% 17%	2399
	11th to 20th	Night	13% 14% 8% 11% 7% 4 5% 4 3 5% 26%	2273
	21st to end	Night	15% 17% 6% 10% 7% 4 5% 4 5% 5% 22%	1882
March	1st to 10th	Night	14% 12% 7% 8% 7% 4 4 3 4 5% 33%	2002
	11th to 20th	Night	13% 13% 7% 8% 6% 3 5% 4 5% 4 32%	1979
	21st to end	Night	15% 10% 3 8% 5% 3 3 4 5% 6% 36%	2165
April	1st to 10th	Night	21% 15% 6% 6% 4 2 4 3 4 5% 30%	1800
	11th to 20th	Night	18% 10% 5% 6% 5% 2 4 3 4 7% 36%	1750
	21st to end	Night	19% 10% 4 7% 7% 3 4 4 5% 6% 31%	1620
May	1st to 10th	Night	19% 6% 2 5% 6% 3 5% 5% 5% 8% 36%	1534
	11th to 20th	Night	15% 8% 2 4 5% 3 4 5% 6% 8% 41%	1415
	21st to end	Night	11% 5% 2 4 5% 3 5% 4 6% 9% 46%	1550
June	1st to 10th	Night	15% 8% 3 6% 5% 3 5% 4 6% 9% 35%	1440
	11th to 20th	Night	13% 8% 2 4 4 3 5% 5% 6% 7% 44%	1422
	21st to end	Night	14% 9% 3 7% 5% 3 5% 4 5% 8% 38%	1260
July	1st to 10th	Night	10% 4 3 5% 5% 4 4 4 5% 8% 48%	1368
	11th to 20th	Night	12% 6% 2 5% 4 3 5% 5% 5% 9% 43%	1440
	21st to end	Night	11% 5% 2 5% 5% 3 5% 5% 5% 10% 45%	1610
August	1st to 10th	Night	10% 5% 2 5% 4 2 4 7% 6% 8% 47%	1611
	11th to 20th	Night	10% 6% 2 5% 5% 3 6% 5% 6% 7% 45%	1598
	21st to end	Night	13% 6% 3 6% 5% 3 4 4 6% 8% 42%	1879
September	1st to 10th	Night	13% 6% 3 4 5% 4 4 5% 5% 8% 44%	1800
	11th to 20th	Night	15% 6% 2 5% 5% 2 4 4 4 7% 47%	1836
	21st to end	Night	19% 8% 3 5% 4 3 4 3 4 5% 41%	2056
October	1st to 10th	Night	20% 8% 3 5% 5% 4 5% 4 5% 6% 36%	2160
	11th to 20th	Night	25% 12% 4 7% 5% 3 4 4 3 5% 27%	2160
	21st to end	Night	24% 15% 4 8% 6% 3 4 3 4 5% 24%	2386
November	1st to 10th	Night	21% 11% 3 7% 5% 3 4 3 5% 6% 32%	2531
	11th to 20th	Night	18% 14% 5% 7% 6% 3 4 4 5% 7% 26%	2660
	21st to end	Night	21% 17% 5% 9% 7% 4 5% 4 4 5% 19%	2660
December	1st to 10th	Night	20% 23% 8% 11% 6% 4 3 4 4 4 13%	2660
	11th to 20th	Night	18% 20% 8% 12% 6% 3 4 3 3 5% 19%	3288
	21st to end	Night	25% 22% 7% 11% 7% 3 3 3 3 4 12%	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	70% 5% 9% 9% 7% 1	2518
	11th to 20th	Day	76% 5% 6% 7% 6% 1	2556
	21st to end	Day	73% 4 6% 9% 6% 1	3124
February	1st to 10th	Day	71% 4 7% 11% 5% 1	1656
	11th to 20th	Day	62% 6% 9% 11% 10% 2	1582
	21st to end	Day	66% 4 8% 12% 9% 1	1373
March	1st to 10th	Day	58% 6% 13% 12% 9% 1	1944
	11th to 20th	Day	59% 5% 8% 16% 9% 2	1980
	21st to end	Day	52% 4 7% 18% 14% 4	2189
April	1st to 10th	Day	58% 5% 9% 17% 10% 2	2160
	11th to 20th	Day	53% 5% 7% 21% 13% 1	2176
	21st to end	Day	55% 5% 8% 18% 11% 3	2340
May	1st to 10th	Day	51% 5% 9% 19% 13% 3	2425
	11th to 20th	Day	48% 5% 8% 24% 14% 1	2482
	21st to end	Day	44% 8% 12% 19% 14% 3	2725
June	1st to 10th	Day	51% 7% 10% 20% 12% 1	2520
	11th to 20th	Day	44% 7% 11% 23% 13% 2	2527
	21st to end	Day	47% 9% 12% 21% 10% 1	2700
July	1st to 10th	Day	37% 8% 12% 28% 13% 2	2514
	11th to 20th	Day	40% 9% 15% 26% 10% 1	2445
	21st to end	Day	44% 8% 13% 25% 9%	2553
August	1st to 10th	Day	46% 10% 12% 20% 11% 1	2314
	11th to 20th	Day	43% 10% 15% 23% 9% 1	2303
	21st to end	Day	43% 9% 14% 24% 9% 1	2458
September	1st to 10th	Day	44% 7% 12% 25% 11% 1	2160
	11th to 20th	Day	40% 8% 13% 28% 11% 1	2120
	21st to end	Day	48% 7% 11% 24% 9%	1904
October	1st to 10th	Day	52% 7% 11% 19% 10% 1	1800
	11th to 20th	Day	63% 7% 11% 12% 6% 1	1800
	21st to end	Day	67% 6% 8% 13% 6%	1968
November	1st to 10th	Day	54% 7% 14% 18% 7% 1	1545
	11th to 20th	Day	62% 8% 11% 13% 6% 1	1520
	21st to end	Day	73% 5% 9% 8% 4 1	1520
December	1st to 10th	Day	74% 6% 7% 9% 4 1	1520
	11th to 20th	Day	69% 6% 6% 10% 8% 1	1906
	21st to end	Day	74% 4 6% 12% 4	2772
January	1st to 10th	Night	74% 5% 8% 10% 3	4429
	11th to 20th	Night	73% 7% 7% 7% 5% 1	4402
	21st to end	Night	72% 7% 6% 9% 6% 1	4532
February	1st to 10th	Night	68% 5% 10% 11% 5% 1	2399
	11th to 20th	Night	62% 4 8% 16% 8%	2275
	21st to end	Night	63% 5% 9% 16% 7%	1882
March	1st to 10th	Night	55% 5% 10% 16% 12% 2	2012
	11th to 20th	Night	55% 5% 10% 18% 10% 2	1980
	21st to end	Night	48% 5% 10% 20% 14% 3	2165
April	1st to 10th	Night	58% 4 7% 18% 11% 2	1800
	11th to 20th	Night	49% 6% 7% 22% 15% 1	1750
	21st to end	Night	53% 6% 9% 15% 15% 2	1620
May	1st to 10th	Night	45% 6% 11% 19% 16% 3	1534
	11th to 20th	Night	41% 6% 10% 24% 17% 2	1416
	21st to end	Night	34% 8% 15% 23% 17% 3	1551
June	1st to 10th	Night	45% 7% 12% 20% 14% 1	1440
	11th to 20th	Night	38% 6% 12% 25% 17% 1	1422
	21st to end	Night	44% 8% 16% 22% 11% 1	1260
July	1st to 10th	Night	32% 8% 13% 25% 21% 2	1328
	11th to 20th	Night	37% 8% 13% 28% 14%	1392
	21st to end	Night	35% 7% 16% 29% 12% 1	1520
August	1st to 10th	Night	34% 8% 18% 26% 13% 1	1600
	11th to 20th	Night	36% 8% 19% 25% 12% 1	1598
	21st to end	Night	39% 8% 14% 28% 11% 1	1879
September	1st to 10th	Night	38% 8% 15% 26% 13% 1	1800
	11th to 20th	Night	37% 8% 13% 30% 12% 1	1836
	21st to end	Night	46% 6% 10% 28% 10%	2056
October	1st to 10th	Night	48% 8% 12% 19% 13%	2160
	11th to 20th	Night	59% 7% 12% 17% 5%	2160
	21st to end	Night	63% 6% 8% 13% 9% 1	2386
November	1st to 10th	Night	53% 5% 13% 21% 8%	2531
	11th to 20th	Night	57% 7% 13% 14% 7% 1	2660
	21st to end	Night	67% 6% 11% 12% 4	2660
December	1st to 10th	Night	74% 6% 8% 9% 4	2660
	11th to 20th	Night	68% 6% 8% 12% 6%	3288
	21st to end	Night	77% 5% 6% 9% 4	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	22% 27% 30% 16% 4 1	180
	11th to 20th	Day	27% 20% 35% 15% 3 1	191
	21st to end	Day	27% 18% 38% 14% 3	297
February	1st to 10th	Day	29% 31% 30% 8% 2	252
	11th to 20th	Day	28% 29% 36% 7%	240
	21st to end	Day	38% 23% 31% 8%	239
March	1st to 10th	Day	25% 21% 36% 15% 3	420
	11th to 20th	Day	26% 22% 33% 15% 4 1	420
	21st to end	Day	32% 19% 28% 16% 6%	462
April	1st to 10th	Day	28% 19% 32% 14% 6%	420
	11th to 20th	Day	33% 22% 21% 15% 7% 3	412
	21st to end	Day	31% 16% 34% 11% 6% 1	420
May	1st to 10th	Day	28% 18% 27% 18% 6% 3	423
	11th to 20th	Day	23% 16% 32% 17% 9% 3	447
	21st to end	Day	20% 18% 30% 19% 10% 3	485
June	1st to 10th	Day	24% 15% 34% 22% 5% 1	450
	11th to 20th	Day	19% 14% 31% 22% 11% 3	457
	21st to end	Day	19% 13% 35% 23% 9% 2	630
July	1st to 10th	Day	13% 8% 34% 30% 11% 4	509
	11th to 20th	Day	16% 11% 29% 28% 12% 5%	444
	21st to end	Day	16% 12% 32% 29% 9% 3	488
August	1st to 10th	Day	16% 6% 31% 28% 13% 6%	446
	11th to 20th	Day	15% 6% 25% 33% 14% 6%	439
	21st to end	Day	19% 9% 32% 21% 13% 6%	495
September	1st to 10th	Day	17% 12% 30% 22% 14% 6%	450
	11th to 20th	Day	15% 11% 25% 23% 18% 8%	450
	21st to end	Day	22% 13% 28% 22% 11% 4	450
October	1st to 10th	Day	27% 18% 23% 17% 12% 4	450
	11th to 20th	Day	30% 24% 27% 14% 4 1	450
	21st to end	Day	37% 18% 27% 14% 3	489
November	1st to 10th	Day	32% 16% 32% 15% 4	239
	11th to 20th	Day	30% 26% 28% 13% 2 2	180
	21st to end	Day	33% 22% 37% 6% 1 1	180
December	1st to 10th	Day	31% 20% 32% 15% 2	180
	11th to 20th	Day	34% 31% 20% 13% 2 1	180
	21st to end	Day	34% 24% 29% 9% 3 1	198
January	1st to 10th	Night	27% 20% 33% 16% 4	760
	11th to 20th	Night	30% 16% 32% 17% 5% 1	760
	21st to end	Night	21% 13% 38% 21% 6% 1	836
February	1st to 10th	Night	24% 22% 33% 19% 3	739
	11th to 20th	Night	21% 21% 38% 16% 4	703
	21st to end	Night	26% 22% 30% 18% 4	592
March	1st to 10th	Night	23% 20% 36% 18% 3	720
	11th to 20th	Night	24% 18% 35% 18% 4 1	720
	21st to end	Night	22% 13% 34% 22% 8%	792
April	1st to 10th	Night	29% 17% 32% 18% 5%	720
	11th to 20th	Night	25% 16% 31% 18% 9% 1	686
	21st to end	Night	25% 11% 31% 22% 11%	540
May	1st to 10th	Night	24% 7% 28% 27% 13% 1	454
	11th to 20th	Night	19% 8% 34% 29% 9%	354
	21st to end	Night	12% 8% 35% 32% 12% 1	389
June	1st to 10th	Night	16% 9% 36% 30% 9% 1	360
	11th to 20th	Night	16% 10% 27% 35% 11% 1	360
	21st to end	Night	19% 8% 23% 36% 14%	360
July	1st to 10th	Night	10% 5% 28% 40% 18%	350
	11th to 20th	Night	13% 5% 29% 34% 19% 1	348
	21st to end	Night	10% 4 28% 38% 19%	430
August	1st to 10th	Night	14% 3 21% 35% 25% 2	537
	11th to 20th	Night	12% 4 19% 37% 25% 2	534
	21st to end	Night	16% 7% 28% 29% 20% 2	691
September	1st to 10th	Night	15% 9% 30% 27% 18% 3	720
	11th to 20th	Night	17% 7% 24% 29% 19% 4	720
	21st to end	Night	22% 10% 22% 27% 16% 3	720
October	1st to 10th	Night	23% 12% 28% 22% 14% 1	720
	11th to 20th	Night	31% 15% 29% 18% 7% 1	720
	21st to end	Night	33% 15% 29% 19% 3	792
November	1st to 10th	Night	29% 12% 28% 23% 8%	740
	11th to 20th	Night	26% 16% 36% 15% 6% 1	760
	21st to end	Night	32% 16% 28% 19% 4	760
December	1st to 10th	Night	34% 20% 30% 12% 4	760
	11th to 20th	Night	27% 21% 35% 14% 3 1	760
	21st to end	Night	33% 18% 30% 15% 3	836

Page generated at 2024-02-02 05:20:29. Version ac07

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