Hinton
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hinton 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	11% 10% 4 8% 7% 4 6% 6% 6% 7% 29%	74607
	Night	8% 11% 5% 8% 7% 4 6% 5% 6% 7% 32%	75190
Transparency	Day	50% 11% 15% 16% 7% 1	74282
	Night	48% 10% 15% 18% 8% 1	75034
Seeing	Day	18% 16% 29% 23% 11% 2	14997
	Night	15% 13% 31% 28% 12% 1	23492

By Month

Percentage Cloud Cover NW (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	5% 10% 6% 11% 9% 4 7% 6% 6% 8% 28%	1139
	11th to 20th	Day	4 11% 6% 9% 8% 3 7% 5% 8% 9% 31%	1232
	21st to end	Day	5% 11% 5% 11% 7% 5% 6% 6% 7% 9% 27%	1584
February	1st to 10th	Day	5% 11% 6% 14% 8% 4 6% 5% 7% 7% 27%	1440
	11th to 20th	Day	4 13% 8% 11% 9% 5% 6% 6% 6% 7% 25%	1450
	21st to end	Day	2 10% 6% 13% 10% 5% 7% 6% 5% 7% 27%	1472
March	1st to 10th	Day	4 10% 5% 11% 9% 6% 6% 6% 7% 9% 28%	1800
	11th to 20th	Day	4 10% 6% 8% 6% 5% 6% 7% 7% 9% 32%	1837
	21st to end	Day	5% 15% 7% 11% 8% 4 7% 7% 7% 8% 21%	2366
April	1st to 10th	Day	6% 14% 7% 11% 10% 4 7% 8% 8% 8% 18%	2160
	11th to 20th	Day	7% 17% 6% 10% 8% 5% 5% 6% 5% 6% 24%	2274
	21st to end	Day	10% 14% 6% 9% 8% 4 6% 5% 5% 7% 26%	2472
May	1st to 10th	Day	15% 15% 5% 9% 7% 4 6% 6% 5% 5% 22%	2520
	11th to 20th	Day	12% 10% 5% 6% 6% 5% 6% 5% 6% 7% 33%	2631
	21st to end	Day	21% 9% 4 8% 6% 4 5% 5% 6% 7% 25%	2941
June	1st to 10th	Day	21% 9% 3 7% 6% 4 7% 5% 7% 7% 24%	2880
	11th to 20th	Day	22% 11% 4 8% 8% 5% 5% 7% 5% 6% 19%	2880
	21st to end	Day	14% 8% 3 8% 8% 5% 6% 6% 7% 7% 28%	2880
July	1st to 10th	Day	19% 8% 3 6% 7% 4 6% 6% 6% 8% 27%	2880
	11th to 20th	Day	16% 6% 3 7% 7% 5% 6% 7% 7% 7% 29%	2880
	21st to end	Day	13% 6% 3 6% 5% 4 7% 6% 7% 9% 34%	2818
August	1st to 10th	Day	15% 7% 3 6% 6% 4 6% 7% 7% 8% 32%	2507
	11th to 20th	Day	12% 6% 3 6% 6% 4 6% 6% 6% 9% 35%	2475
	21st to end	Day	15% 8% 3 7% 7% 4 5% 7% 5% 8% 32%	2572
September	1st to 10th	Day	15% 9% 3 6% 6% 4 5% 5% 5% 8% 35%	2160
	11th to 20th	Day	14% 8% 3 6% 4 3 5% 4 6% 6% 39%	2089
	21st to end	Day	12% 9% 4 6% 7% 3 4 4 5% 7% 39%	1980
October	1st to 10th	Day	11% 14% 3 7% 5% 3 5% 5% 6% 7% 34%	1848
	11th to 20th	Day	9% 10% 3 7% 7% 3 5% 6% 6% 8% 35%	1637
	21st to end	Day	7% 14% 5% 8% 7% 3 4 5% 6% 7% 34%	1782
November	1st to 10th	Day	7% 15% 5% 10% 7% 3 6% 5% 6% 7% 29%	1508
	11th to 20th	Day	4 9% 4 10% 7% 4 6% 5% 8% 9% 34%	1330
	21st to end	Day	4 12% 5% 9% 9% 4 6% 5% 9% 7% 30%	1330
December	1st to 10th	Day	6% 14% 5% 9% 10% 4 6% 5% 5% 9% 27%	1321
	11th to 20th	Day	7% 12% 5% 8% 9% 4 6% 6% 4 9% 32%	1442
	21st to end	Day	2 10% 4 10% 7% 4 5% 4 6% 6% 41%	2090
January	1st to 10th	Night	5% 11% 7% 10% 9% 5% 6% 6% 6% 8% 28%	3026
	11th to 20th	Night	6% 12% 5% 9% 8% 5% 6% 5% 6% 7% 31%	2865
	21st to end	Night	5% 13% 6% 10% 8% 4 6% 6% 6% 7% 28%	2772
February	1st to 10th	Night	5% 12% 5% 12% 9% 5% 5% 5% 5% 7% 30%	2520
	11th to 20th	Night	4 13% 6% 10% 9% 5% 8% 6% 7% 7% 25%	2392
	21st to end	Night	2 11% 6% 10% 9% 5% 8% 5% 6% 6% 31%	1783
March	1st to 10th	Night	3 10% 6% 12% 8% 6% 6% 6% 6% 8% 30%	2160
	11th to 20th	Night	4 11% 5% 9% 6% 4 6% 6% 6% 10% 33%	2121
	21st to end	Night	5% 14% 7% 10% 7% 4 6% 6% 7% 7% 27%	1987
April	1st to 10th	Night	6% 13% 6% 10% 8% 5% 6% 5% 8% 9% 25%	1800
	11th to 20th	Night	9% 16% 5% 10% 7% 4 5% 4 6% 7% 27%	1637
	21st to end	Night	12% 13% 5% 8% 6% 3 5% 5% 6% 6% 31%	1486
May	1st to 10th	Night	15% 13% 4 7% 8% 3 6% 6% 5% 7% 25%	1440
	11th to 20th	Night	10% 10% 4 7% 4 3 5% 6% 6% 9% 36%	1261
	21st to end	Night	19% 10% 4 5% 5% 3 5% 5% 7% 8% 30%	1332
June	1st to 10th	Night	20% 9% 4 5% 7% 4 4 5% 5% 7% 30%	1080
	11th to 20th	Night	21% 8% 4 6% 8% 4 8% 6% 7% 7% 21%	1080
	21st to end	Night	15% 7% 2 8% 5% 4 7% 5% 8% 9% 31%	1080
July	1st to 10th	Night	17% 6% 3 6% 5% 3 4 6% 7% 8% 35%	1080
	11th to 20th	Night	18% 6% 3 5% 6% 4 6% 7% 8% 8% 30%	1080
	21st to end	Night	11% 5% 2 5% 5% 4 6% 6% 6% 9% 40%	1492
August	1st to 10th	Night	13% 7% 3 5% 5% 4 5% 6% 7% 8% 36%	1432
	11th to 20th	Night	13% 6% 2 5% 5% 4 5% 5% 5% 8% 41%	1424
	21st to end	Night	14% 7% 3 6% 5% 4 4 5% 8% 7% 36%	1781
September	1st to 10th	Night	16% 8% 3 7% 5% 3 4 5% 5% 7% 37%	1800
	11th to 20th	Night	16% 10% 2 6% 4 3 4 4 6% 7% 39%	1871
	21st to end	Night	13% 8% 3 6% 5% 3 4 5% 6% 7% 40%	1980
October	1st to 10th	Night	10% 12% 4 7% 6% 4 4 5% 6% 8% 34%	2110
	11th to 20th	Night	10% 11% 3 7% 6% 3 5% 5% 6% 8% 36%	2322
	21st to end	Night	6% 12% 6% 10% 8% 4 5% 6% 6% 7% 29%	2574
November	1st to 10th	Night	8% 14% 5% 9% 6% 3 4 5% 7% 7% 32%	2550
	11th to 20th	Night	5% 11% 5% 9% 8% 4 6% 5% 6% 7% 34%	2850
	21st to end	Night	6% 11% 6% 9% 8% 4 7% 5% 7% 7% 31%	2850
December	1st to 10th	Night	5% 10% 5% 11% 10% 4 6% 5% 5% 6% 32%	2856
	11th to 20th	Night	5% 14% 6% 9% 8% 5% 7% 6% 6% 6% 28%	3750
	21st to end	Night	2 10% 6% 10% 7% 4 5% 5% 7% 8% 36%	5566

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	50% 10% 16% 16% 5% 2	1139
	11th to 20th	Day	48% 9% 16% 15% 11% 1	1232
	21st to end	Day	49% 10% 14% 15% 10% 1	1584
February	1st to 10th	Day	55% 8% 10% 15% 10% 2	1440
	11th to 20th	Day	55% 10% 12% 15% 8%	1458
	21st to end	Day	54% 8% 12% 14% 9% 2	1472
March	1st to 10th	Day	49% 11% 17% 16% 8% 1	1800
	11th to 20th	Day	44% 10% 17% 20% 9% 1	1837
	21st to end	Day	58% 12% 15% 10% 5%	2366
April	1st to 10th	Day	58% 12% 14% 11% 4	2160
	11th to 20th	Day	58% 8% 12% 15% 6%	2274
	21st to end	Day	56% 11% 13% 16% 5% 1	2472
May	1st to 10th	Day	60% 11% 12% 11% 5% 1	2520
	11th to 20th	Day	48% 12% 14% 16% 9% 1	2635
	21st to end	Day	56% 9% 14% 14% 6% 1	2942
June	1st to 10th	Day	56% 11% 12% 15% 5% 2	2880
	11th to 20th	Day	63% 11% 11% 11% 4	2880
	21st to end	Day	52% 12% 15% 14% 6% 2	2880
July	1st to 10th	Day	52% 12% 15% 16% 5% 1	2801
	11th to 20th	Day	50% 13% 16% 16% 4 1	2793
	21st to end	Day	42% 14% 19% 19% 5%	2661
August	1st to 10th	Day	45% 14% 18% 16% 7%	2490
	11th to 20th	Day	43% 11% 20% 20% 6% 1	2475
	21st to end	Day	47% 10% 17% 17% 7% 1	2572
September	1st to 10th	Day	45% 10% 18% 20% 6% 2	2160
	11th to 20th	Day	43% 9% 16% 21% 9% 2	2089
	21st to end	Day	44% 9% 17% 16% 11% 3	1980
October	1st to 10th	Day	47% 10% 17% 17% 8% 1	1848
	11th to 20th	Day	44% 11% 15% 23% 7% 1	1637
	21st to end	Day	49% 8% 14% 21% 8% 1	1782
November	1st to 10th	Day	53% 9% 14% 16% 7% 1	1508
	11th to 20th	Day	44% 12% 16% 17% 10% 1	1330
	21st to end	Day	48% 12% 19% 12% 6% 3	1330
December	1st to 10th	Day	54% 10% 10% 16% 9% 2	1321
	11th to 20th	Day	48% 9% 17% 16% 8% 1	1444
	21st to end	Day	38% 11% 13% 21% 13% 4	2090
January	1st to 10th	Night	52% 10% 13% 16% 7% 3	3026
	11th to 20th	Night	48% 11% 14% 16% 8% 2	2865
	21st to end	Night	51% 8% 12% 17% 10% 1	2772
February	1st to 10th	Night	53% 9% 12% 14% 10% 2	2520
	11th to 20th	Night	53% 10% 15% 14% 7% 1	2394
	21st to end	Night	50% 8% 13% 19% 10% 1	1783
March	1st to 10th	Night	49% 10% 13% 19% 8% 1	2160
	11th to 20th	Night	45% 9% 14% 22% 10% 1	2122
	21st to end	Night	51% 12% 14% 16% 7% 1	1987
April	1st to 10th	Night	52% 10% 17% 15% 6%	1800
	11th to 20th	Night	55% 9% 13% 17% 6% 1	1637
	21st to end	Night	51% 11% 13% 18% 6% 1	1486
May	1st to 10th	Night	55% 11% 13% 15% 6%	1440
	11th to 20th	Night	42% 11% 16% 19% 12%	1261
	21st to end	Night	49% 11% 15% 18% 7%	1332
June	1st to 10th	Night	51% 11% 15% 16% 6% 1	1080
	11th to 20th	Night	57% 13% 15% 12% 3	1080
	21st to end	Night	46% 13% 17% 17% 5% 1	1080
July	1st to 10th	Night	41% 12% 22% 17% 7% 1	1050
	11th to 20th	Night	48% 14% 17% 17% 4	1044
	21st to end	Night	39% 12% 22% 23% 5%	1410
August	1st to 10th	Night	44% 11% 23% 18% 4	1424
	11th to 20th	Night	39% 10% 20% 23% 7%	1424
	21st to end	Night	43% 12% 17% 21% 8%	1781
September	1st to 10th	Night	44% 10% 15% 22% 7% 2	1800
	11th to 20th	Night	43% 7% 16% 23% 8% 2	1871
	21st to end	Night	39% 12% 17% 21% 10% 1	1980
October	1st to 10th	Night	47% 9% 15% 20% 8%	2110
	11th to 20th	Night	44% 9% 17% 23% 7% 1	2322
	21st to end	Night	51% 11% 14% 16% 7% 1	2574
November	1st to 10th	Night	48% 9% 14% 19% 8% 1	2550
	11th to 20th	Night	47% 10% 16% 16% 10% 1	2850
	21st to end	Night	49% 10% 15% 15% 8% 2	2850
December	1st to 10th	Night	50% 9% 11% 17% 10% 2	2856
	11th to 20th	Night	52% 11% 14% 16% 6% 1	3747
	21st to end	Night	40% 12% 16% 21% 9% 2	5566

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	11% 12% 32% 32% 9% 4	180
	11th to 20th	Day	11% 14% 39% 25% 9% 2	170
	21st to end	Day	13% 19% 36% 23% 8% 1	176
February	1st to 10th	Day	18% 22% 33% 18% 7% 3	160
	11th to 20th	Day	10% 23% 35% 23% 8% 1	210
	21st to end	Day	8% 20% 34% 28% 10% 1	343
March	1st to 10th	Day	13% 23% 34% 18% 10% 2	420
	11th to 20th	Day	15% 20% 34% 20% 8% 3	420
	21st to end	Day	18% 23% 31% 18% 10% 2	462
April	1st to 10th	Day	19% 23% 31% 21% 5% 2	420
	11th to 20th	Day	18% 21% 25% 23% 9% 4	412
	21st to end	Day	17% 21% 32% 19% 10% 2	420
May	1st to 10th	Day	22% 17% 31% 22% 7% 2	423
	11th to 20th	Day	17% 11% 27% 27% 16% 2	602
	21st to end	Day	23% 9% 24% 25% 15% 4	703
June	1st to 10th	Day	21% 19% 29% 21% 9% 1	810
	11th to 20th	Day	26% 14% 25% 22% 11% 1	810
	21st to end	Day	19% 12% 25% 25% 16% 3	810
July	1st to 10th	Day	21% 10% 27% 25% 15% 2	796
	11th to 20th	Day	19% 13% 27% 25% 15% 1	792
	21st to end	Day	14% 11% 26% 27% 18% 4	564
August	1st to 10th	Day	18% 9% 23% 32% 14% 4	447
	11th to 20th	Day	15% 17% 30% 25% 10% 2	437
	21st to end	Day	19% 16% 31% 20% 12% 2	495
September	1st to 10th	Day	22% 18% 28% 24% 7% 2	450
	11th to 20th	Day	20% 18% 28% 22% 10% 2	450
	21st to end	Day	23% 25% 22% 20% 7% 2	450
October	1st to 10th	Day	24% 16% 29% 20% 9% 3	450
	11th to 20th	Day	18% 18% 33% 21% 8% 1	287
	21st to end	Day	20% 15% 37% 18% 8% 3	297
November	1st to 10th	Day	19% 23% 32% 17% 6% 3	213
	11th to 20th	Day	17% 18% 37% 23% 4 1	180
	21st to end	Day	14% 22% 32% 21% 6% 4	180
December	1st to 10th	Day	11% 22% 28% 22% 12% 6%	180
	11th to 20th	Day	11% 19% 33% 26% 12%	180
	21st to end	Day	10% 15% 36% 29% 8% 3	198
January	1st to 10th	Night	14% 15% 37% 25% 8% 1	1040
	11th to 20th	Night	15% 16% 38% 23% 8% 1	937
	21st to end	Night	13% 19% 36% 25% 8%	792
February	1st to 10th	Night	14% 17% 31% 24% 13% 1	720
	11th to 20th	Night	9% 16% 37% 28% 10%	704
	21st to end	Night	9% 14% 31% 31% 14% 3	592
March	1st to 10th	Night	9% 15% 31% 31% 12% 2	720
	11th to 20th	Night	9% 14% 35% 29% 11% 2	720
	21st to end	Night	12% 11% 32% 31% 13% 1	792
April	1st to 10th	Night	14% 11% 30% 32% 13% 1	720
	11th to 20th	Night	18% 11% 30% 30% 11% 1	569
	21st to end	Night	17% 11% 33% 27% 12%	406
May	1st to 10th	Night	19% 10% 20% 39% 12%	360
	11th to 20th	Night	12% 8% 22% 40% 17%	354
	21st to end	Night	22% 6% 21% 29% 20% 1	389
June	1st to 10th	Night	25% 7% 24% 30% 14% 1	360
	11th to 20th	Night	25% 7% 20% 31% 16% 1	360
	21st to end	Night	18% 8% 23% 28% 21% 3	360
July	1st to 10th	Night	19% 4 18% 38% 20% 1	350
	11th to 20th	Night	19% 7% 22% 29% 24%	348
	21st to end	Night	12% 6% 16% 31% 33% 2	394
August	1st to 10th	Night	15% 3 17% 31% 31% 3	358
	11th to 20th	Night	16% 5% 18% 35% 24% 1	356
	21st to end	Night	18% 8% 23% 35% 16% 1	593
September	1st to 10th	Night	20% 8% 21% 34% 15% 1	720
	11th to 20th	Night	20% 6% 24% 33% 15% 1	720
	21st to end	Night	17% 14% 27% 30% 11% 2	720
October	1st to 10th	Night	19% 10% 28% 31% 11% 1	720
	11th to 20th	Night	17% 13% 31% 28% 10% 1	720
	21st to end	Night	15% 14% 39% 24% 7% 1	792
November	1st to 10th	Night	18% 16% 36% 23% 7%	768
	11th to 20th	Night	13% 20% 38% 23% 5%	950
	21st to end	Night	14% 19% 38% 22% 6% 1	950
December	1st to 10th	Night	13% 15% 40% 22% 10%	954
	11th to 20th	Night	11% 15% 37% 28% 8% 1	1040
	21st to end	Night	10% 15% 41% 25% 8% 1	1144

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