Quesnel
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Quesnel clear sky chart from 2005-11-06 to 2026-07-31.

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	9% 10% 4 9% 6% 6% 6% 5% 7% 8% 32%	142009
	Night	10% 13% 4 10% 6% 6% 6% 4 6% 7% 28%	139708
Transparency	Day	48% 9% 15% 20% 8% 1	141704
	Night	53% 8% 14% 17% 6% 1	139596
Seeing	Day	15% 12% 24% 27% 17% 5%	18575
	Night	18% 11% 21% 30% 17% 2	26398

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	9% 17% 7% 16% 8% 8% 7% 4 5% 5% 14%	4045
	11th to 20th	Day	8% 10% 4 9% 5% 6% 7% 6% 7% 7% 32%	4119
	21st to end	Day	9% 15% 5% 12% 7% 6% 5% 4 6% 6% 25%	4603
February	1st to 10th	Day	12% 16% 5% 11% 7% 5% 5% 3 5% 7% 24%	1752
	11th to 20th	Day	9% 15% 6% 11% 7% 7% 5% 4 5% 6% 25%	1845
	21st to end	Day	6% 15% 6% 11% 8% 4 5% 4 6% 6% 27%	1557
March	1st to 10th	Day	5% 14% 6% 11% 8% 7% 6% 5% 7% 8% 23%	4636
	11th to 20th	Day	4 10% 3 10% 7% 7% 8% 6% 9% 9% 26%	5110
	21st to end	Day	8% 14% 4 10% 6% 6% 6% 5% 7% 6% 30%	5830
April	1st to 10th	Day	7% 13% 5% 10% 9% 7% 7% 5% 6% 7% 25%	2520
	11th to 20th	Day	7% 12% 4 10% 7% 6% 6% 5% 7% 7% 28%	2654
	21st to end	Day	9% 10% 3 10% 6% 6% 6% 5% 6% 8% 31%	2914
May	1st to 10th	Day	7% 8% 3 8% 5% 6% 5% 4 6% 8% 41%	8195
	11th to 20th	Day	8% 9% 4 12% 7% 7% 7% 6% 7% 7% 26%	8335
	21st to end	Day	11% 10% 4 9% 6% 6% 7% 6% 8% 9% 25%	9923
June	1st to 10th	Day	11% 8% 3 8% 7% 6% 6% 5% 6% 8% 32%	3360
	11th to 20th	Day	12% 8% 3 8% 6% 6% 6% 6% 7% 8% 28%	3360
	21st to end	Day	9% 7% 3 9% 6% 6% 6% 5% 8% 9% 32%	3360
July	1st to 10th	Day	7% 6% 2 6% 4 5% 5% 5% 7% 8% 46%	7268
	11th to 20th	Day	8% 5% 2 6% 4 4 4 4 7% 8% 48%	6930
	21st to end	Day	7% 5% 2 6% 4 5% 6% 5% 8% 10% 41%	7526
August	1st to 10th	Day	3 3 2 4 3 4 4 4 6% 8% 60%	4556
	11th to 20th	Day	5% 5% 2 6% 4 5% 6% 4 7% 9% 46%	4375
	21st to end	Day	11% 7% 3 8% 6% 5% 5% 5% 6% 8% 35%	4619
September	1st to 10th	Day	10% 6% 2 7% 5% 5% 4 3 6% 8% 43%	2400
	11th to 20th	Day	10% 8% 3 6% 6% 5% 5% 4 5% 8% 39%	2400
	21st to end	Day	17% 10% 4 8% 6% 5% 5% 4 5% 7% 29%	2112
October	1st to 10th	Day	13% 13% 4 11% 6% 6% 5% 5% 5% 6% 25%	3280
	11th to 20th	Day	16% 13% 4 9% 5% 4 5% 4 5% 7% 27%	3246
	21st to end	Day	11% 10% 4 11% 6% 6% 5% 4 6% 7% 30%	3006
November	1st to 10th	Day	17% 15% 4 9% 6% 6% 5% 5% 6% 6% 22%	1648
	11th to 20th	Day	12% 16% 6% 10% 9% 7% 5% 4 6% 6% 19%	1680
	21st to end	Day	12% 21% 5% 12% 9% 7% 5% 4 5% 5% 14%	1445
December	1st to 10th	Day	14% 19% 5% 14% 9% 5% 6% 4 6% 4 13%	2020
	11th to 20th	Day	10% 18% 6% 12% 9% 7% 7% 5% 6% 6% 12%	2322
	21st to end	Day	7% 19% 5% 14% 6% 6% 5% 4 5% 8% 22%	3058
January	1st to 10th	Night	9% 20% 7% 16% 7% 6% 6% 4 4 5% 16%	8905
	11th to 20th	Night	8% 14% 5% 9% 5% 5% 5% 5% 6% 6% 34%	8779
	21st to end	Night	10% 17% 5% 11% 6% 6% 5% 4 6% 6% 25%	9576
February	1st to 10th	Night	12% 16% 5% 12% 6% 6% 6% 4 5% 6% 22%	2866
	11th to 20th	Night	8% 15% 7% 11% 6% 5% 5% 4 6% 7% 27%	2662
	21st to end	Night	8% 17% 5% 10% 6% 4 5% 4 6% 6% 29%	2249
March	1st to 10th	Night	5% 16% 5% 10% 6% 7% 6% 4 7% 9% 24%	5474
	11th to 20th	Night	4 12% 5% 12% 8% 8% 7% 6% 7% 7% 24%	5109
	21st to end	Night	9% 11% 5% 8% 6% 6% 6% 5% 7% 7% 30%	5387
April	1st to 10th	Night	6% 12% 4 10% 7% 6% 6% 5% 7% 7% 28%	2100
	11th to 20th	Night	9% 10% 4 8% 6% 7% 6% 6% 8% 9% 28%	1913
	21st to end	Night	10% 11% 3 10% 6% 5% 6% 4 7% 6% 33%	1705
May	1st to 10th	Night	9% 9% 3 9% 6% 5% 5% 4 6% 8% 35%	4724
	11th to 20th	Night	13% 11% 4 9% 6% 6% 6% 4 6% 9% 26%	4522
	21st to end	Night	17% 10% 3 10% 7% 6% 6% 4 5% 6% 26%	4246
June	1st to 10th	Night	14% 9% 3 7% 6% 5% 6% 5% 5% 6% 33%	1260
	11th to 20th	Night	16% 9% 3 10% 5% 6% 5% 4 7% 9% 26%	1260
	21st to end	Night	13% 7% 3 8% 8% 6% 6% 5% 6% 8% 29%	1260
July	1st to 10th	Night	8% 5% 2 5% 4 5% 5% 5% 7% 7% 48%	2908
	11th to 20th	Night	6% 4 2 6% 5% 4 4 4 6% 8% 51%	3250
	21st to end	Night	10% 5% 2 7% 5% 4 5% 4 7% 10% 41%	3538
August	1st to 10th	Night	4 4 1 5% 3 4 3 3 6% 7% 60%	2594
	11th to 20th	Night	6% 5% 2 7% 5% 5% 5% 4 7% 10% 44%	2672
	21st to end	Night	13% 7% 2 8% 5% 5% 5% 5% 8% 8% 33%	3278
September	1st to 10th	Night	11% 5% 2 7% 5% 5% 5% 4 6% 8% 43%	2000
	11th to 20th	Night	10% 6% 2 8% 6% 6% 5% 4 6% 6% 42%	2000
	21st to end	Night	16% 10% 4 8% 5% 5% 5% 4 6% 7% 31%	2286
October	1st to 10th	Night	14% 13% 4 11% 7% 5% 5% 4 6% 7% 25%	3920
	11th to 20th	Night	11% 9% 3 9% 6% 6% 6% 5% 7% 10% 28%	3910
	21st to end	Night	11% 11% 4 11% 6% 6% 6% 4 5% 6% 29%	4787
November	1st to 10th	Night	16% 14% 4 10% 6% 6% 6% 4 6% 6% 21%	2870
	11th to 20th	Night	12% 14% 4 11% 7% 6% 6% 5% 6% 6% 22%	2940
	21st to end	Night	12% 18% 5% 12% 8% 6% 6% 5% 6% 6% 17%	3148
December	1st to 10th	Night	12% 17% 5% 11% 7% 6% 6% 5% 6% 6% 19%	5380
	11th to 20th	Night	13% 22% 7% 13% 8% 5% 5% 4 5% 5% 15%	6090
	21st to end	Night	7% 16% 7% 12% 7% 6% 6% 4 6% 7% 23%	8140

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	68% 11% 10% 9% 2	4045
	11th to 20th	Day	49% 8% 19% 16% 5% 3	4140
	21st to end	Day	59% 10% 16% 13% 2	4604
February	1st to 10th	Day	61% 6% 12% 10% 11% 1	1752
	11th to 20th	Day	59% 8% 16% 14% 4	1854
	21st to end	Day	56% 7% 13% 13% 8% 1	1557
March	1st to 10th	Day	55% 9% 10% 17% 9%	4636
	11th to 20th	Day	48% 10% 14% 19% 9%	5110
	21st to end	Day	51% 8% 11% 20% 9% 1	5830
April	1st to 10th	Day	55% 9% 13% 16% 6%	2520
	11th to 20th	Day	51% 8% 13% 19% 8% 1	2654
	21st to end	Day	49% 9% 13% 21% 8%	2914
May	1st to 10th	Day	40% 6% 14% 29% 10% 1	8195
	11th to 20th	Day	52% 9% 11% 21% 7% 1	8338
	21st to end	Day	50% 9% 17% 20% 4	9924
June	1st to 10th	Day	48% 10% 13% 18% 11% 1	3360
	11th to 20th	Day	49% 11% 14% 19% 6%	3360
	21st to end	Day	45% 11% 18% 20% 6% 1	3360
July	1st to 10th	Day	35% 7% 13% 23% 19% 3	7191
	11th to 20th	Day	33% 8% 18% 27% 13% 2	6849
	21st to end	Day	35% 8% 20% 26% 11% 1	7319
August	1st to 10th	Day	22% 7% 15% 39% 16% 1	4538
	11th to 20th	Day	33% 8% 22% 28% 9%	4417
	21st to end	Day	45% 8% 23% 18% 4 1	4618
September	1st to 10th	Day	38% 10% 22% 21% 8% 1	2400
	11th to 20th	Day	43% 10% 18% 21% 8%	2400
	21st to end	Day	54% 9% 17% 15% 5% 1	2112
October	1st to 10th	Day	57% 9% 18% 12% 4	3280
	11th to 20th	Day	56% 8% 20% 14% 2	3246
	21st to end	Day	52% 9% 22% 14% 3	3006
November	1st to 10th	Day	61% 9% 12% 13% 4	1648
	11th to 20th	Day	64% 10% 11% 10% 5%	1680
	21st to end	Day	69% 11% 8% 9% 3	1445
December	1st to 10th	Day	72% 11% 9% 6% 2	2020
	11th to 20th	Day	69% 10% 10% 6% 5%	2324
	21st to end	Day	60% 9% 15% 14% 3	3058
January	1st to 10th	Night	69% 7% 10% 10% 3	8906
	11th to 20th	Night	49% 7% 19% 14% 7% 4	8820
	21st to end	Night	59% 10% 16% 13% 2	9576
February	1st to 10th	Night	63% 6% 11% 11% 9%	2866
	11th to 20th	Night	55% 8% 16% 15% 6% 1	2664
	21st to end	Night	53% 8% 14% 16% 7% 2	2249
March	1st to 10th	Night	51% 10% 12% 18% 8% 1	5474
	11th to 20th	Night	50% 10% 13% 18% 8% 1	5110
	21st to end	Night	48% 9% 12% 21% 10%	5387
April	1st to 10th	Night	52% 8% 14% 18% 8%	2100
	11th to 20th	Night	49% 9% 13% 20% 9%	1913
	21st to end	Night	49% 8% 11% 23% 9% 1	1705
May	1st to 10th	Night	45% 6% 13% 26% 10% 1	4721
	11th to 20th	Night	51% 8% 13% 24% 5%	4522
	21st to end	Night	57% 7% 10% 20% 5% 1	4250
June	1st to 10th	Night	49% 10% 10% 18% 11% 1	1260
	11th to 20th	Night	52% 9% 14% 18% 7%	1260
	21st to end	Night	50% 11% 13% 18% 6% 1	1260
July	1st to 10th	Night	33% 9% 14% 23% 18% 3	2876
	11th to 20th	Night	32% 7% 17% 34% 10% 1	3208
	21st to end	Night	36% 7% 21% 24% 11% 1	3440
August	1st to 10th	Night	24% 6% 13% 42% 15%	2587
	11th to 20th	Night	33% 9% 18% 31% 8% 1	2696
	21st to end	Night	45% 9% 24% 17% 4 1	3278
September	1st to 10th	Night	38% 10% 16% 25% 9% 1	2000
	11th to 20th	Night	39% 9% 15% 27% 10% 1	2000
	21st to end	Night	51% 8% 14% 18% 8%	2286
October	1st to 10th	Night	57% 8% 17% 14% 4	3920
	11th to 20th	Night	49% 9% 17% 22% 3	3910
	21st to end	Night	54% 8% 20% 14% 4	4787
November	1st to 10th	Night	62% 8% 11% 13% 5%	2870
	11th to 20th	Night	60% 10% 12% 13% 5%	2940
	21st to end	Night	66% 9% 10% 10% 4 1	3148
December	1st to 10th	Night	64% 10% 15% 8% 3	5380
	11th to 20th	Night	71% 9% 9% 7% 4	6087
	21st to end	Night	60% 8% 15% 12% 4	8140

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	19% 19% 23% 27% 8% 4	220
	11th to 20th	Day	16% 18% 25% 24% 14% 3	220
	21st to end	Day	21% 21% 22% 22% 10% 4	242
February	1st to 10th	Day	22% 21% 24% 18% 13% 2	292
	11th to 20th	Day	16% 14% 33% 24% 12% 2	425
	21st to end	Day	17% 21% 33% 19% 8% 1	355
March	1st to 10th	Day	16% 18% 30% 21% 13% 2	535
	11th to 20th	Day	16% 22% 28% 21% 11% 2	540
	21st to end	Day	19% 16% 28% 20% 12% 5%	594
April	1st to 10th	Day	16% 18% 28% 25% 11% 2	540
	11th to 20th	Day	13% 17% 29% 23% 12% 5%	532
	21st to end	Day	13% 16% 25% 26% 14% 6%	540
May	1st to 10th	Day	10% 14% 32% 27% 14% 4	543
	11th to 20th	Day	11% 10% 26% 27% 20% 6%	625
	21st to end	Day	12% 11% 25% 28% 20% 4	937
June	1st to 10th	Day	14% 10% 27% 29% 17% 3	990
	11th to 20th	Day	17% 9% 23% 27% 20% 4	990
	21st to end	Day	10% 7% 19% 33% 23% 6%	990
July	1st to 10th	Day	12% 5% 20% 32% 26% 6%	924
	11th to 20th	Day	10% 9% 18% 33% 24% 6%	768
	21st to end	Day	7% 6% 19% 34% 26% 8%	845
August	1st to 10th	Day	6% 5% 18% 35% 26% 9%	542
	11th to 20th	Day	7% 8% 24% 30% 23% 8%	517
	21st to end	Day	10% 9% 24% 26% 20% 10%	583
September	1st to 10th	Day	14% 7% 20% 25% 22% 12%	530
	11th to 20th	Day	15% 9% 18% 29% 21% 8%	530
	21st to end	Day	25% 14% 26% 22% 11% 2	530
October	1st to 10th	Day	23% 13% 23% 21% 16% 4	530
	11th to 20th	Day	23% 13% 25% 20% 17% 2	527
	21st to end	Day	28% 14% 24% 23% 9% 2	297
November	1st to 10th	Day	31% 20% 25% 16% 6% 2	220
	11th to 20th	Day	22% 18% 25% 23% 8% 3	220
	21st to end	Day	21% 18% 26% 18% 12% 5%	220
December	1st to 10th	Day	24% 15% 21% 25% 10% 5%	220
	11th to 20th	Day	16% 15% 21% 31% 15% 2	220
	21st to end	Day	21% 17% 25% 26% 9% 3	242
January	1st to 10th	Night	22% 16% 26% 23% 10% 2	997
	11th to 20th	Night	22% 13% 24% 28% 12% 1	950
	21st to end	Night	21% 16% 22% 26% 13% 2	1032
February	1st to 10th	Night	23% 14% 20% 26% 14% 3	840
	11th to 20th	Night	16% 13% 20% 36% 13% 1	824
	21st to end	Night	17% 12% 24% 30% 15% 2	692
March	1st to 10th	Night	16% 16% 24% 28% 14% 3	840
	11th to 20th	Night	13% 16% 28% 27% 14% 2	840
	21st to end	Night	14% 11% 20% 30% 22% 2	924
April	1st to 10th	Night	14% 10% 21% 33% 19% 4	840
	11th to 20th	Night	14% 9% 23% 35% 17% 2	665
	21st to end	Night	13% 10% 27% 30% 17% 2	445
May	1st to 10th	Night	15% 10% 21% 33% 20% 2	420
	11th to 20th	Night	12% 6% 20% 35% 25% 2	414
	21st to end	Night	15% 7% 20% 31% 24% 3	455
June	1st to 10th	Night	17% 7% 20% 36% 19% 2	420
	11th to 20th	Night	18% 7% 16% 33% 22% 3	420
	21st to end	Night	14% 5% 12% 39% 27% 3	420
July	1st to 10th	Night	13% 3 16% 33% 33% 1	410
	11th to 20th	Night	12% 4 17% 35% 31% 2	408
	21st to end	Night	10% 2 13% 37% 32% 6%	458
August	1st to 10th	Night	5% 4 11% 33% 40% 6%	398
	11th to 20th	Night	8% 2 13% 37% 36% 4	452
	21st to end	Night	15% 5% 12% 33% 28% 6%	680
September	1st to 10th	Night	13% 4 16% 36% 27% 3	800
	11th to 20th	Night	12% 5% 15% 31% 29% 7%	800
	21st to end	Night	23% 8% 25% 27% 16% 1	800
October	1st to 10th	Night	20% 9% 19% 34% 16% 3	800
	11th to 20th	Night	22% 12% 21% 26% 18% 2	800
	21st to end	Night	21% 14% 24% 26% 12% 2	880
November	1st to 10th	Night	27% 17% 20% 27% 8% 1	820
	11th to 20th	Night	23% 14% 28% 24% 10% 1	840
	21st to end	Night	26% 14% 22% 26% 10% 2	1018
December	1st to 10th	Night	21% 13% 21% 29% 14% 2	1160
	11th to 20th	Night	23% 14% 23% 27% 11% 1	1160
	21st to end	Night	20% 16% 25% 28% 10% 2	1276

Page generated at 2026-07-28 00:25:23. Version ac07

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